Acura Coupes and Sedans 1994-2000 Repair Information

Cylinder Head

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REMOVAL & INSTALLATION



The radio may have a coded theft protection circuit. Make sure you have the code before disconnecting the battery, removing the radio fuse, or removing the radio.

1.8L (B18B1) Engines

  1. Before removing the cylinder head, be sure the engine temperature is below 100-- (38--); a fully cooled engine is best.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Be sure the crankshaft is at TDC on No. 1 cylinder by aligning the white mark on the crankshaft pulley with the pointer on the lower timing belt cover.
  6.  

See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: Always align the timing marks before removing the timing belt.

  1. Drain the engine coolant. Remove the radiator cap to speed draining.
  2.  
  3. Remove the intake air duct.
  4.  
  5. Properly relieve the fuel system pressure, as outlined in Fuel System .
  6.  
  7. Disconnect the fuel feed hose. Be sure to mark all connectors and vacuum hoses before disconnecting them.
  8.  
  9. Disconnect the breather hose, water bypass hose and the evaporative emission control canister hose.
  10.  
  11. Remove the Positive Crankcase Ventilation (PCV) hose and the fuel return hose.
  12.  
  13. Remove the brake booster vacuum hose, water bypass and EVAP (Evaporative emissions) purge control solenoid vacuum hose.
  14.  
  15. Remove the throttle cable. Remove the throttle control cable (automatic transaxle only). Be careful not to bend the cables when removing them.
  16.  
  17. Remove the wiring harness clamps, then label and detach the following:

    Four fuel injector connectors
     
    Intake Air Temperature (IAT) sensor connector
     
    Engine Coolant Temperature (ECT) sensor connector
     
    Ignition coil connector
     
    Throttle Position (TP) sensor connector
     
    Manifold Absolute Pressure (MAP) sensor connector
     
    Idle Air Control (IAC) valve connector
     
    Purge control solenoid valve connector
     

  18.  
  19. Disconnect the upper radiator hose, heater hose and water bypass hose.
  20.  
  21. Remove the splash shield.
  22.  
  23. Remove the power steering adjusting and mounting bolts, then remove the power steering pump and belt. Do not disconnect the power steering hoses.
  24.  
  25. Remove the air conditioning belts and the compressor, then remove the cruise control actuator.
  26.  
  27. Remove the engine side mount.
  28.  
  29. Remove the cylinder head cover, timing belt cover, and timing belt.
  30.  

See Figure 2

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Fig. Fig. 2: Removal of the timing belt

  1. Remove the camshaft pulleys and back cover.
  2.  

See Figures 3, 4 and 5

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Fig. Fig. 3: Removing the camshaft sprocket bolt ...



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Fig. Fig. 4: ... then remove the camshaft sprocket



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Fig. Fig. 5: The woodruff keeps the camshaft pulley from spinning on the camshaft

  1. Remove the exhaust manifold cover, bracket, and exhaust manifold.
  2.  

See Figure 6

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Fig. Fig. 6: The exhaust manifold gasket may be stuck to the head

  1. Remove the bolts attaching the intake manifold to the support bracket.
  2.  
  3. Remove the nuts attaching the intake manifold to the cylinder head. Remove the nuts in a crisscross pattern, beginning from the center and moving out to both ends.
  4.  

It may be more timely to remove the head and then the intake manifold. This method will provide easier access to any hidden intake manifold bolts.

  1. Remove the manifold and the old gasket.
  2.  
  3. Loosen the lock nuts and adjusting screws, then remove the camshaft holder bolts. Remove the camshaft holders, camshafts and rocker arms.
  4.  

See Figures 7 through 13

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Fig. Fig. 7: Remove the camshaft holder bolts. Notice that the caps are marked (E1) for exhaust camshaft cap #1 and (I1) for intake camshaft #1



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Fig. Fig. 8: Lift the camshaft cap away from the camshaft as shown



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Fig. Fig. 9: Make sure to keep the caps, and all components in order at all times



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Fig. Fig. 10: Evenly lift the camshaft from the head



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Fig. Fig. 11: Note the location of the camshaft oil seal



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Fig. Fig. 12: Remove the valve adjusters-Integra



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Fig. Fig. 13: To ensure they are installed in the proper position on the head, place each valve adjuster in the correct slot of the cardboard keeper as shown

  1. Remove the cylinder head bolts, then remove the cylinder head. To prevent warpage, unscrew the bolts in the reverse of the torque sequence, 1 / 3 turn at a time. Repeat the sequence until all bolts are loosened. Remember that cylinder head bolts are under great stress, exercise caution whenever you apply extreme force to these bolts.
  2.  
  3. Remove and discard the gasket, thoroughly clean the gasket mating surfaces.
  4.  

To install:
  1. Install the cylinder head onto the engine block, after making sure the mating surface was cleaned and a new gasket was installed. Be sure to pay attention to the following points:

    Be sure the No. 1 cylinder is at top dead center and the camshaft pulley UP mark is on the top before positioning the head in place.
     
    The cylinder head dowel pins and oil control orifice must be cleaned and aligned.
     
    Replace the washer when damaged or deteriorated.
     
    Apply engine oil to the cylinder head bolts and the washers.
     
    Use the longer cylinder head bolts at the No. 1 and No. 2 positions.
     

  2.  

See Figures 14 and 15

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Fig. Fig. 14: Cylinder head bolt torque sequence-1.8L (B18B1) engines



Click image to see an enlarged view

Fig. Fig. 15: Properly torque all of the head bolts in the correct order

  1. Tighten the cylinder head bolts in two steps. In the first step tighten all bolts in sequence to 22 ft. lbs. (29 Nm), then in the second step tighten all bolts in the same sequence to 63 ft. lbs. (85 Nm).
  2.  
  3. Use new gaskets and install the intake manifold onto the cylinder head. Tighten the nuts in a crisscross pattern in 2-3 steps, beginning in the middle to 17 ft. lbs. (23 Nm).
  4.  
  5. Install and tighten the intake manifold bracket bolts to 17 ft. lbs. (24 Nm).
  6.  
  7. Install the exhaust manifold and tighten the new self-locking nuts in a crisscross pattern in 2-3 steps, beginning with the inner nuts. Tighten the nuts to 23 ft. lbs. (31 Nm). Install a new exhaust pipe gasket and tighten the new nuts to 40 ft. lbs. (54 Nm).
  8.  
  9. Be sure that the keyways on the camshafts are facing up and that the rocker arms are in their original position. The valve lock nuts should be loosened and the adjusting screw backed off before installation.
  10.  
  11. Place the rocker arms on the pivot bolts and the valve stems.
  12.  
  13. Install the camshafts, then install the camshaft seals with the open side facing in. Install the rubber cap with liquid gasket applied. If the rubber cap has two horizontal marks, align the marks with the cylinder head upper surface.
  14.  
  15. Apply liquid gasket to the cylinder head mating surfaces of the No. 1 and No. 6 intake and exhaust camshaft holders and install them, along with No. 2, 3, 4 and 5. Be sure to pay attention to the following points:

    "I" or "E" marks are stamped on the camshaft holders.
     
    Do not apply oil to the holder mating surface of camshaft seals.
     
    The arrows marked on the camshaft holders should point to the timing belt.
     

  16.  
  17. Tighten the camshaft holders temporarily. Be sure that the rocker arms are properly positioned on the valve stems.
  18.  
  19. Tighten each bolt in 2 steps to ensure that the rockers do not bind on the valves. Tighten the 6mm bolts to 86 inch lbs. (9.8 Nm) working from the middle outward.
  20.  
  21. Install the keys into the camshaft grooves. To set the No. 1 piston at TDC, align the holes on the camshaft with the holes in the No. 1 camshaft holders and insert 5.0mm pin punches into the holes.
  22.  
  23. Install the back cover and push the camshaft pulleys onto the camshafts, then tighten the retaining bolts to 27 ft. lbs. (37 Nm). Install the timing belt and adjust the tension, then install the timing belt covers.
  24.  
  25. Adjust the valve clearance.
  26.  
  27. Apply sealant to the corners of the outer camshaft journal gasket surfaces, install the cylinder head cover, and torque the fasteners to 86 inch lbs. (9.8 Nm).
  28.  
  29. Install the engine side mount, tighten the two new nuts and new bolt to the engine to 38 ft. lbs. (52 Nm) and tighten the bolt attaching the mount to the vehicle to 54 ft. lbs. (74 Nm).
  30.  
  31. The balance of installation is the reverse of the removal procedure.
  32.  
  33. Connect the negative battery cable and enter the radio security code.
  34.  
  35. After installation, check to see that all hoses and wires are installed correctly.
  36.  
  37. Fill and bleed the air from the cooling system.
  38.  
  39. Attach the negative battery cable.
  40.  
  41. Enter the radio security code.
  42.  

1.8L (B18C1, B18C5) engines

  1. Before removing the cylinder head, be sure the engine temperature is below 100° F degrees; a fully cooled engine is best.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Be sure the crankshaft is at TDC/compression on No. 1 cylinder. Align the white mark on the crankshaft pulley with the pointer on the lower timing belt cover.
  6.  
  7. Drain the engine coolant into a sealable container. Remove the radiator cap to speed draining.
  8.  
  9. Remove the strut brace.
  10.  
  11. Remove the intake air duct.
  12.  
  13. Properly relieve the fuel pressure.
  14.  
  15. Disconnect the fuel feed hose.
  16.  
  17. Be sure to mark all connectors and vacuum hoses before disconnecting them. Disconnect the Evaporative Emissions (EVAP) purge control solenoid vacuum hose and the EVAP control canister hose.
  18.  
  19. Remove the Positive Crankcase Ventilation (PCV) hose and the water bypass hose.
  20.  
  21. Remove the brake booster vacuum hose, and the fuel return hose.
  22.  
  23. Remove the throttle cable. Remove the throttle control cable (automatic transaxle only). Be careful not to bend the cables when removing them.
  24.  
  25. Remove the wiring harness clamps, then tag and detach the following:

    Four fuel injector connectors
     
    Intake Air Temperature (IAT) sensor connector
     
    Engine Coolant Temperature (ECT) sensor connector
     
    Top Dead Center (TDC) Crank Position (CKP) sensor and Camshaft Position (CYP) sensor connector
     
    Ignition coil connector
     
    Engine Coolant Temperature (ECT) gauge sending unit connector
     
    Throttle Position (TP) sensor connector
     
    Variable Valve Timing and Electronic Lift Control (VTEC) solenoid connector
     
    VTEC pressure switch connector
     
    Manifold Absolute Pressure (MAP) sensor connector
     
    Idle Air Control (IAC) valve connector
     
    Purge control solenoid valve connector
     
    Intake Air Bypass (IAB) control solenoid valve connector
     
    Crankshaft Speed Fluctuation (CKF) sensor connector
     

  26.  
  27. Remove the spark plug wires and distributor from the cylinder head.
  28.  
  29. Disconnect the upper radiator hose, heater hose and water bypass hose.
  30.  
  31. Remove the splash shield.
  32.  
  33. Remove the engine ground cable.
  34.  
  35. Remove the power steering adjusting and mounting bolts, then remove the power steering pump and belt. Do not disconnect the power steering hoses.
  36.  
  37. Remove the heat shield from the power steering bracket.
  38.  
  39. Remove the air conditioning compressor and alternator belts.
  40.  
  41. Remove the cruise control actuator.
  42.  
  43. Remove the engine side mount.
  44.  
  45. Remove the cylinder head cover, timing belt cover, and timing belt.
  46.  
  47. Remove the camshaft sprockets and back cover.
  48.  
  49. Remove the exhaust manifold cover, bracket, and exhaust manifold.
  50.  
  51. Remove the bolts attaching the intake manifold to the support bracket.
  52.  
  53. Remove the nuts attaching the intake manifold to the cylinder head. Remove the nuts in a crisscross pattern, beginning from the center and moving out to both ends.
  54.  
  55. Remove the manifold and the old gasket.
  56.  
  57. Remove the VTEC solenoid from the cylinder head.
  58.  
  59. Loosen the rocker arm lock nuts and adjusting screws.
  60.  
  61. Remove the camshaft holder bolts, then remove the camshaft holder plates, the camshaft holders, and camshafts.
  62.  
  63. Remove the cylinder head bolts, then remove the cylinder head. To prevent warpage, loosen the bolts in the reverse of the torque sequence 1/3 turn at a time. Repeat this sequence until all bolts are loosened.
  64.  

To install:
  1. Install the cylinder head onto the engine block, after making sure the mating surface was cleaned and a new gasket was installed. Be sure to pay attention to the following points:

    Be sure the No. 1 cylinder is at top dead center and the camshaft pulley UP mark is on the top before positioning the head in place.
     
    The cylinder head dowel pins and oil control orifice must be cleaned and aligned.
     
    Replace the washer when damaged or deteriorated.
     
    Apply engine oil to the cylinder head bolts and the washers.
     
    Use the longer cylinder head bolts at the No. 1 and No. 2 positions.
     

  2.  
  3. Tighten the cylinder head bolts in two steps. In the first step tighten all bolts in sequence to 22 ft. lbs. (29 Nm). In the second step tighten all the bolts in the same sequence to 63 ft. lbs. (85 Nm).
  4.  

See Figures 16 and 17

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Fig. Fig. 16: Cylinder head bolt torque sequence-1.8L (B18C1, B18C5) engine



Click image to see an enlarged view

Fig. Fig. 17: Camshaft holder plate torque sequence-1.8L (B18C1, B18C5) engine

  1. Use new gaskets and install the intake manifold onto the cylinder head; tighten the nuts in a crisscross pattern in 2-3 steps, beginning in the middle. Tighten the nuts to 17 ft. lbs. (23 Nm).
  2.  
  3. Install and tighten the intake manifold bracket bolts to 17 ft. lbs. (24 Nm).
  4.  
  5. Install the VTEC solenoid with a new filter, tighten the attaching bolts to 17 ft. lbs. (24 Nm).
  6.  
  7. Install the exhaust manifold and tighten the new self-locking nuts in a crisscross pattern in 2-3 steps, beginning with the inner nuts. Tighten the nuts to 23 ft. lbs. (31 Nm). Install a new exhaust pipe gasket and tighten the new nuts to 40 ft. lbs. (54 Nm).
  8.  
  9. Install the exhaust manifold bracket and cover. Tighten the bracket attaching bolts to 33 ft. lbs. (44 Nm) and the cover bolts to 17 ft. lbs. (24 Nm).
  10.  
  11. Be sure that the keyways on the camshafts are facing up and that the rocker arms are in their original position. The valve lock nuts should be loosened and the adjusting screw backed off.
  12.  
  13. Install the camshafts, then install the camshaft seals with the open side facing in. Install the rubber cap with liquid gasket applied. If the rubber cap has two horizontal marks, align the marks with the cylinder head upper surface.
  14.  
  15. Install a new O-ring and the dowel pin to the oil passage of the No. 3 camshaft holder.
  16.  
  17. Apply liquid gasket to the cylinder head mating surfaces of the No. 1 and No. 5 intake and exhaust camshaft holders, then install them, along with No. 2, 3, and 4. Be sure to pay attention to the following points:

    Do not apply oil to the holder mating surface of camshaft seals.
     
    The arrows marked on the camshaft holders should point to the timing belt.
     

  18.  
  19. Tighten the camshaft holders temporarily. Be sure that the rocker arms are properly positioned on the valve stems.
  20.  
  21. Tighten each bolt in 2 steps to ensure that the rockers do not bind on the valves. Tighten the 8x1.25mm bolts to 20 ft. lbs. (27 Nm), and the 6 x 1.0mm bolts to 7.2 ft. lbs. (9.8 Nm).
  22.  
  23. Install the back cover and tighten the attaching bolt to 86 inch lbs. (9.8 Nm). Install the keys into the camshaft grooves, then push the camshaft pulleys onto the camshafts, and then tighten the retaining bolts to 41 ft. lbs. (56 Nm).
  24.  
  25. Install the timing belt and adjust the tension, then install the timing belt covers.
  26.  
  27. Adjust the valve clearance.
  28.  
  29. Install the rubber seal in the groove of the cylinder head cover. Be sure that the seal and groove are thoroughly clean first.
  30.  
  31. Apply liquid gasket to the rubber seal at the eight corners of the recesses. Do not install the parts if 20 minutes or more have elapsed since applying the liquid gasket. Instead, reapply liquid gasket after removing old residue.
  32.  
  33. Install the cylinder head cover and engine ground cable. Be sure the contact surfaces are clean and do not touch surfaces where liquid gasket has been applied.
  34.  
  35. Tighten the cylinder head cover nuts in 2-3 steps. In the final step, tighten all nuts in sequence, to 86 inch lbs. (10 Nm).
  36.  
  37. Install the engine side mount, tighten the two new nuts and new bolt to the engine to 38 ft. lbs. (52 Nm) and tighten the bolt attaching the mount to the vehicle to 54 ft. lbs. (74 Nm).
  38.  
  39. The balance of installation is the reverse of the removal procedure.
  40.  
  41. Fill and bleed the air from the cooling system.
  42.  
  43. Connect the negative battery cable and enter the radio security code.
  44.  
  45. After installation, check to see that all hoses and wires are installed correctly.
  46.  
  47. Change the engine oil. Wait at least 20 minutes for the sealant to cure before filling the engine with oil.
  48.  
  49. Check for any fluid leaks and top off as necessary.
  50.  

2.2L, 2.3L Engines

  1. Disconnect the negative battery cable.
  2.  
  3. Turn the crankshaft so the No. 1 piston is at Top Dead Center (TDC).
  4.  

The No. 1 piston is at top dead center when the pointer on the block aligns with the white painted mark on the flywheel (manual transaxle) or driveplate (automatic transaxle).

  1. Drain the engine coolant into a sealable container.
  2.  
  3. Properly relieve the fuel system pressure, as outlined in Fuel System .
  4.  
  5. Remove the air intake duct.
  6.  
  7. Remove the evaporative emissions (EVAP) control canister hose from the intake manifold.
  8.  
  9. Remove the throttle cable from the throttle body.
  10.  

Be careful not to bend the cable when removing. Always replace a kinked cable with a new one.

  1. Disconnect the fuel feed and return hose.
  2.  
  3. Remove the brake booster vacuum hose from the intake manifold.
  4.  
  5. Tag and detach the following engine wiring harness connectors:

    Fuel injector connectors
     
    Variable Valve Timing and Electronic Lift Control (VTEC) solenoid connector
     
    Intake Air Temperature (IAT) sensor connector
     
    Idle Air Control (IAC) valve connector
     
    Throttle Position (TP) sensor connector
     
    Exhaust Gas Recirculation (EGR) valve lift sensor
     
    Ground cable terminals
     
    Engine Coolant Temperature (ECT) switch B connector
     
    Heated Oxygen (HO 2 S) sensor connector
     
    ECT sensor
     
    ECT gauge sending unit connector
     
    Ignition Control Module (ICM) connector
     
    Top Dead Center (TDC) Crank Position (CKP) sensor and Camshaft Position (CYP) sensor connector
     
    Vehicle Speed Sensor (VSS) connector
     
    Ignition coil connector
     
    Intake Air Bypass (IAB) solenoid valve connector
     
    ECT switch A connector
     
    Knock sensor connector
     

  6.  
  7. Remove the engine ground cable from the cylinder head cover.
  8.  
  9. Remove the distributor and ignition wires.
  10.  
  11. Remove the connector and the terminal from the alternator, then remove the engine wiring harness from the valve cover.
  12.  
  13. Remove the mounting bolts and drive belt from the power steering pump. Pull the pump away from the mounting bracket, without disconnecting the hoses. Support the pump out of the way.
  14.  
  15. Remove the ignition coil.
  16.  
  17. Tag, then disconnect the emissions vacuum hoses from the intake manifold assembly.
  18.  
  19. Remove the bypass hose from the intake manifold.
  20.  
  21. Remove the upper radiator hose and the heater hose from the cylinder head.
  22.  
  23. Remove the lower radiator hose and bypass hose.
  24.  
  25. Support the engine with a jack and remove the side engine mount.
  26.  
  27. Remove the cylinder head cover.
  28.  
  29. Remove the timing belt.
  30.  
  31. Remove the camshaft pulley and the back cover.
  32.  
  33. Remove the lower splash shield.
  34.  
  35. Remove the intake manifold bracket bolts.
  36.  
  37. Remove the intake manifold.
  38.  
  39. Disconnect the exhaust pipe from the exhaust manifold.
  40.  
  41. Remove the exhaust manifold and the exhaust manifold heat insulator.
  42.  
  43. Remove the cylinder head bolts in the reverse order of the tightening sequence.
  44.  

To prevent warpage, unscrew the bolts in sequence1/3turn at a time. Repeat the sequence until all bolts are loosened.

See Figure 18

Click image to see an enlarged view

Fig. Fig. 18: Cylinder head bolt removal sequence-2.3L engine

  1. Separate the cylinder head from the engine block with a suitable flat bladed prytool.
  2.  

To install:
  1. Be sure all cylinder head and block gasket surfaces are clean. Check the cylinder head for warpage. If warpage is less than 0.002 in. (0.05mm), cylinder head resurfacing is not required. Maximum resurface limit is 0.008 in. (0.2mm) based on a cylinder head height of 5.20 in. (132.0mm).
  2.  
  3. Always use a new head gasket.
  4.  
  5. Be sure the No. 1 cylinder is at TDC.
  6.  
  7. Clean the oil control orifice and install a new O-ring. The cylinder head dowel pins and oil control jet must be aligned.
  8.  
  9. Install the bolts that secure the intake manifold to its bracket but do not tighten them.
  10.  
  11. Install the cylinder head, then tighten the cylinder head bolts sequentially in the following steps:

    Step 1: 22 ft. lbs. (29 Nm).
     
    Step 2: 90 degrees
     
    Step 3: 90 degrees
     
    Step 4 (Only if using new bolts): 90 degrees
     

  12.  

A beam type torque wrench is recommended. If a bolt makes any noise while being tightened, loosen the bolt and retighten it.

See Figure 19

Click image to see an enlarged view

Fig. Fig. 19: Cylinder head bolt torque sequence-2.3L engine

  1. Install the intake manifold with a new gasket.
  2.  
  3. Install the exhaust manifold with a new gasket.
  4.  
  5. Install the exhaust manifold bracket, then install the exhaust pipe, bracket and upper shroud.
  6.  
  7. Install the camshafts and rocker arms.
  8.  
  9. Install the timing belt back cover.
  10.  
  11. Install the side engine mount bracket B. Tighten the bolt attaching the bracket to the cylinder head to 33 ft. lbs. (45 Nm). Tighten the bolts attaching the bracket to the side engine mount to 16 ft. lbs. (22 Nm).
  12.  
  13. Install the camshaft sprockets onto the camshafts.
  14.  
  15. Install the timing belt.
  16.  
  17. Adjust the valves.
  18.  
  19. Tighten the crankshaft pulley bolt to 181 ft. lbs. (250 Nm).
  20.  
  21. Install the splash shield.
  22.  
  23. Install the remaining components in the reverse order of removal.
  24.  
  25. Drain the oil from the engine into a sealable container. Install the drain plug and refill the engine with clean oil.
  26.  
  27. Fill and bleed the air from the cooling system.
  28.  
  29. Connect the negative battery cable and enter the radio security code.
  30.  
  31. Start the engine, checking carefully for any leaks.
  32.  

2.5L Engine

  1. Disconnect the negative battery cable and drain the coolant into a suitable container.
  2.  
  3. Disconnect the wiring from the ignition coil and the ground wire.
  4.  
  5. Properly relieve the fuel system pressure, as outlined in Fuel System .
  6.  
  7. Remove the fuel filler cap and loosen the service bolt on the fuel filter banjo bolt to relieve the fuel system pressure. Remove the banjo bolt to disconnect the fuel feed hose from the fuel filter. Disconnect the fuel return hose from the pressure regulator.
  8.  
  9. Remove the intake air duct and air cleaner assembly.
  10.  
  11. Loosen the air conditioner compressor and alternator adjustment bolts. Remove the drive belts.
  12.  
  13. Remove the throttle cable by loosening the locknut, then slip the cable end out of the throttle bracket and accelerator linkage. Do not bend the cable when removing it. Unbolt the throttle cable clamp and move the cable aside.
  14.  
  15. Label and disconnect the fuel and vacuum hoses from the intake manifold. Be sure to mark all electrical connectors and vacuum hoses before disconnecting them.
  16.  
  17. Disconnect the upper radiator hose, the heater hoses, and the water bypass hoses and unbolt the wiring harness clips.
  18.  
  19. Disconnect the brake booster hose, canister hose, and the two vacuum hoses from the rear of the cylinder head.
  20.  
  21. Remove the two distributor mounting bolts. Remove the distributor, ignition wires, and ground cables from the cylinder head.
  22.  
  23. Disconnect the wiring harness holder that is routed across the front of the cylinder head.
  24.  
  25. Tag and detach the following:

    Five fuel injector connectors
     
    Intake Air Temperature (IAT) sensor connector
     
    Engine Coolant Temperature (ECT) sensor connector
     
    Top Dead Center (TDC) Crank Position (CKP) sensor and Camshaft Position (CMP) sensor connector
     
    Engine Coolant Temperature (ECT) gauge sending unit connector
     
    Throttle Position (TP) sensor connector
     
    Purge control solenoid valve connector
     
    Intake Air Bypass (IAB) control solenoid valve connector
     

  26.  
  27. Unbolt the intake manifold support brackets. The manifold may be removed after removing the cylinder head.
  28.  
  29. Detach the Oxygen (O 2 S) sensor connector.
  30.  
  31. Remove the exhaust manifold heat shields and disconnect the exhaust pipe from the manifold.
  32.  
  33. Remove the support bracket and remove the exhaust manifold.
  34.  
  35. Remove the cylinder head cover and upper timing belt cover.
  36.  
  37. Remove the timing belt. Replace the belt if it shows any signs of stress or damage.
  38.  
  39. Remove the camshaft position sensor and the camshaft sprocket.
  40.  
  41. Remove the back cover and unbolt the TDC/CKP sensor.
  42.  
  43. Loosen each cylinder head bolt about 1 / 3 turn at a time. Follow the reverse of the installation sequence to prevent warping the head. Repeat until all bolts are loose and can be removed.
  44.  
  45. If the cylinder head is stuck to the block, there are pry points at each end of the cylinder head. Do not pry against the gasket surfaces.
  46.  
  47. Carefully remove the cylinder head from the vehicle.
  48.  

To install:
  1. Be sure the cylinder head and the engine block sealing surfaces are flat and clean. Resurface the head if it is warped. Clean all gasket surfaces and run a tap through the bolt holes in the block to clean the threads. Be sure the bolt holes are clean and dry so the head can be tightened properly.
  2.  
  3. Install a new O-ring onto the oil control orifice and install the orifice and dowel pins onto the block. Lay the new head gasket in place.
  4.  
  5. Verify that the crankshaft and camshaft are both at TDC for number one piston.
  6.  

See Figures 20 and 21

Click image to see an enlarged view

Fig. Fig. 20: Cylinder head prying points-2.5L engine



Click image to see an enlarged view

Fig. Fig. 21: Tighten the cylinder head bolts in the correct sequence as shown-2.5TL

  1. Carefully fit the cylinder head to the block. Be sure the oil control orifice is properly aligned.
  2.  
  3. Lightly oil the threads and washer surfaces of the cylinder head bolts and install them. Tighten the bolts in sequence as follows:

    Step 1: 29 ft. lbs.(39 Nm)
     
    Step 2: 51 ft. lbs. (69 Nm)
     
    Step 3: 72 ft. lbs. (97 Nm)
     

  4.  
  5. Install the intake manifold onto the cylinder head with a new gasket. Tighten the nuts in a crisscross pattern in 2 steps to 16 ft. lbs. (22 Nm).
  6.  
  7. Install the intake manifold brackets.
  8.  
  9. Loosely install the exhaust manifold bracket onto the manifold. Install the exhaust manifold with a new gasket and new self-locking nuts and tighten the nuts to 23 ft. lbs. (32 Nm).
  10.  
  11. Connect the exhaust pipe and install the manifold shields.
  12.  
  13. Reconnect the O 2 S sensor.
  14.  
  15. Install the timing belt and covers.
  16.  
  17. Adjust the valves.
  18.  
  19. Apply sealant to the ends of the cylinder head near the camshaft holders. Install the cylinder head cover with new rubber seals as required.
  20.  
  21. The balance of installation is the reverse of the removal procedure.
  22.  
  23. Replace the engine oil and filter.
  24.  
  25. Verify that all wiring, grounds, hoses, and cables are properly connected.
  26.  
  27. Connect the battery cable. Run the engine to bleed the cooling system and check for leaks. Check for proper cooling system and engine operation. Top off all fluid levels as necessary.
  28.  
  29. Enter the radio security code.
  30.  

3.0L, 3.2 and 3.5L Engines

  1. Obtain the security code for the radio.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. On 3.5L engines, remove the strut brace.
  6.  
  7. Drain the coolant into a sealable container.
  8.  
  9. Remove the canister hose from the throttle body.
  10.  
  11. Remove the air intake duct.
  12.  
  13. Remove the upper engine covers.
  14.  
  15. Disconnect the accelerator and cruise control cables from the throttle body.
  16.  
  17. Remove the spark plug wire holder, cover and intake manifold covers.
  18.  
  19. Properly relieve the fuel system pressure, as outlined in Fuel System .
  20.  
  21. Disconnect the fuel hoses from the supply rail.
  22.  
  23. Remove the upper and lower radiator hoses.
  24.  
  25. Disconnect the heater hoses.
  26.  
  27. Tag and disconnect the following hoses and lines:

    Brake booster vacuum hose
     
    Positive Crankcase Ventilation (PCV) hose
     
    Breather hose
     
    Water bypass hose
     
    Vacuum hose from the throttle body
     

  28.  
  29. Remove the ground cable from the engine.
  30.  
  31. Remove the A/C, alternator and power steering belts.
  32.  
  33. On 3.0L engines, perform the following:
    1. Support the engine with a jack and a block of wood and remove the side engine mounting bracket.
    2.  
    3. Remove the power steering pump without disconnecting the hoses.
    4.  
    5. Remove the alternator.
    6.  

  34.  
  35. Tag and detach the following engine wiring harness connectors:

    Intake Air Temperature (IAT) sensor connector
     
    Engine Coolant Temperature (ECT) sensor connector
     
    Top Dead Center (TDC) Crank Position (CKP) sensor and Camshaft Position (CYP) sensor connector
     
    Ignition coil connector
     
    Engine Coolant Temperature (ECT) gauge sending unit connector
     
    Throttle Position (TP) sensor connector
     
    Variable Valve Timing and Electronic Lift Control (VTEC) solenoid connector
     
    VTEC pressure switch connector
     
    Manifold Absolute Pressure (MAP) sensor connector
     
    Idle Air Control (IAC) valve connector
     
    Engine oil pressure switch
     

  36.  
  37. On 3.0L engines, remove the distributor and spark plug wires.
  38.  
  39. On 3.2 and 3.5L engines disconnect the battery cables from the under-hood fuse/relay box and remove the box, then disconnect and remove the six ignition coils.
  40.  
  41. On 3.2L engines remove the Exhaust Gas Recirculation (EGR) pipe.
  42.  
  43. Remove the intake manifold.
  44.  
  45. On 3.0L engines, detach the connectors from the fuel injectors, remove the fuel supply rails and remove the vacuum hoses from the fuel control valve.
  46.  
  47. Set the engine to TDC by aligning the marks on the crankshaft and camshaft pulleys.
  48.  
  49. Remove the timing belt.
  50.  
  51. Remove both exhaust manifolds.
  52.  
  53. Remove the water passage assembly.
  54.  
  55. Remove the camshaft pulleys and rear timing belt covers.
  56.  
  57. Loosen each cylinder head bolt 1 / 3 turn at a time in the reverse order of the tightening sequence.
  58.  
  59. Remove the cylinder heads.
  60.  

See Figures 22 and 23

Click image to see an enlarged view

Fig. Fig. 22: Loosen the cylinder head bolts in the sequence shown to prevent damage to the head-3.0L engine



Click image to see an enlarged view

Fig. Fig. 23: Loosen the cylinder head bolts in the sequence shown-3.5L engine

To install:
  1. Clean the cylinder head and the surface of the cylinder block.
  2.  
  3. Install the oil control orifices and using new O-rings.
  4.  
  5. If removed, install the dowel pins.
  6.  
  7. Position new cylinder head gaskets on the cylinder block.
  8.  
  9. If moved, set the crankshaft and camshaft pulleys to TDC by aligning the marks on the pulley and oil pump.
  10.  
  11. Carefully position the cylinder heads on the engine.
  12.  
  13. Lubricate the cylinder head bolts with clean engine oil.
  14.  

See Figure 24

Click image to see an enlarged view

Fig. Fig. 24: Tighten the cylinder head bolts in the sequence shown to prevent damage to the head-3.0L engine

If any cylinder head bolt makes noise while being tightened, loosen the bolts and begin the tightening sequence again.

  1. On the 3.0L engine tighten the cylinder head bolts in three steps. Be sure to follow the proper torque sequence:

    Step 1: 29 ft. lbs. (39 Nm)
     
    Step 2: 51 ft. lbs. (69 Nm)
     
    Step 3: 72 ft. lbs. (98 Nm).
     

  2.  
  3. On the 3.2L and 3.5L engines tighten the cylinder head bolts in two steps. Be sure to follow the proper torque sequence:

    Step 1: 29 ft. lbs. (39 Nm)
     
    Step 2: 56 ft. lbs. (76 Nm)
     

  4.  

See Figures 25 and 26

Click image to see an enlarged view

Fig. Fig. 25: Cylinder head bolt torque sequence-3.2L engines



Click image to see an enlarged view

Fig. Fig. 26: Cylinder head bolt tightening sequence-3.5L engine

  1. Install the exhaust manifolds.
  2.  
  3. Install the back covers.
  4.  
  5. Install the camshaft pulleys and torque to the following specifications:

    3.0L engines: 67 ft. lbs. (90 Nm)
     
    3.2L and 3.5L engines: 23 ft. lbs. (31 Nm)
     

  6.  
  7. Install the timing belt.
  8.  
  9. Check and adjust the valve clearance if necessary.
  10.  
  11. Install the cylinder head cover. Tighten the bolts to 104 inch lbs. (12 Nm).
  12.  
  13. Install the intake manifold. Be sure to use new gaskets and O-rings. Tighten the bolts to 16 ft. lbs. (22 Nm).
  14.  
  15. Install all of the remaining hoses, tubes and connectors in reverse order of disassembly.
  16.  
  17. Change the engine oil and filter.
  18.  
  19. Top off the cooling system with the correct mixture of coolant and bleed as necessary.
  20.  
  21. Connect the negative battery cable.
  22.  
  23. Bring the engine to operating temperature and inspect for any fluid leaks. Top off all fluid levels as necessary.
  24.  
  25. Enter the security code for the radio.
  26.  

The PCM idle memory must be reset after reconnecting the battery. Start the engine and hold it at 3000 rpm until the cooling fan comes on. Then allow the engine to idle for about five minutes with all accessories OFF and with the transaxle in Park or Neutral.

 
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