Acura Coupes and Sedans 1994-2000 Repair Information

Camshaft

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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 See Figures 1 through 6

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Fig. Fig. 1: Pull the caps away from the camshaft and place them in order on a piece of cardboard.



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Fig. Fig. 2: Carefully lift the camshaft from the cylinder head.



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Fig. Fig. 3: Remove the camshaft cap bolts



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Fig. Fig. 4: Pull the caps away from the camshaft and place them in order on a piece of cardboard



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Fig. Fig. 5: Carefully lift the camshaft from the cylinder head



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Fig. Fig. 6: Keep the correct camshaft with the appropriate caps at all times

  1. Disconnect the negative battery cable.
  2.  
  3. Tag and disconnect the spark plug wires.
  4.  
  5. Remove the cylinder head cover and timing belt cover.
  6.  
  7. Rotate the crankshaft to Top Dead Center (TDC), compression of No. 1 piston and remove the timing belt.
  8.  
  9. Remove the distributor from the cylinder head.
  10.  
  11. Install 5.0mm pin punches to the No.1 camshaft holders, then remove the camshaft sprockets.
  12.  
  13. Loosen the valve adjusters to remove as much spring tension as possible.
  14.  
  15. Remove the pin punches from the camshaft holders.
  16.  

To install:
  1. Check the following before installing the camshafts:
    1. Be certain the keyways on the camshafts are facing UP (No. 1 cylinder at TDC).
    2.  
    3. The valve adjuster lock nuts should be loosened and the adjusting screws backed off before installation.
    4.  

  2.  
  3. Lubricate the rocker arms and camshafts with clean oil.
  4.  
  5. Place the rocker arms on the pivot bolts and the valve stems, making sure that the rocker arms are in their original positions.
  6.  
  7. Install the camshaft seals with the open side (spring) facing in. Lubricate the lip of the seal.
  8.  
  9. Be sure the keyways on the camshafts are facing up and install the camshafts to the cylinder head.
  10.  
  11. Apply liquid gasket to the head mating surfaces of the No. 1 and No. 6 camshaft holders, then install them along with No. 2, 3, 4 and 5 camshaft holders. The arrows stamped on the holders should point toward the timing belt. Do not apply oil to the holder mating surface where the camshaft seals are housed.
  12.  
  13. Tighten the camshaft holders temporarily and be sure that the rocker arms are properly positioned.
  14.  
  15. Press the oil seals into the No.1 camshaft holders with a seal driver.
  16.  
  17. Tighten the bolts in a crisscross pattern to 7 ft. lbs. (10 Nm). Check that the rockers do not bind on the valves.
  18.  
  19. Install the cylinder head plug to the end of the cylinder head. If the plug has alignment marks, align the marks with the cylinder head upper surface.
  20.  
  21. If equipped with a timing belt back cover, install the cover and tighten the bolts to 7.2 ft. lbs. (9.8 Nm).
  22.  
  23. Install 5.0mm pin punches to the No.1 camshaft holders, then install the camshaft pulley keys onto the grooves in the camshafts.
  24.  
  25. Push the camshaft pulleys onto the camshafts, then tighten the retaining bolts to 27 ft. lbs. (38 Nm).
  26.  
  27. Install the timing belt and timing belt covers. Remove the pin punches from the camshaft holders.
  28.  
  29. Adjust the valves and pour oil over the camshafts and rocker arms.
  30.  
  31. Install the cylinder head cover and engine ground cable.
  32.  
  33. Install the distributor to the cylinder head and reconnect the spark plug wires to the spark plugs.
  34.  
  35. Connect the negative battery cable and enter the radio security code.
  36.  
  37. Change the engine oil. Wait at least 20 minutes for the sealant to cure before filling the engine with oil.
  38.  

1.8L (B18C1, B18C5) Engines

  1. Disconnect the negative battery cable.
  2.  
  3. Be sure the crankshaft is at Top Dead Center (TDC), compression on No. 1 cylinder, by aligning the white mark on the crankshaft pulley with the pointer on the lower timing belt cover.
  4.  
  5. Remove the strut brace.
  6.  
  7. Remove the cylinder head cover, timing belt cover, and timing belt.
  8.  
  9. Remove the camshaft pulleys and back cover.
  10.  
  11. Loosen the rocker arm lock nuts and adjusting screws.
  12.  
  13. Remove the camshaft holder bolts, then remove the camshaft holder plates, the camshaft holders, and camshafts.
  14.  

See Figure 7

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Fig. Fig. 7: Camshaft holder plates torque sequence-1.8L (B18C1, B18C5) engines

To install:
  1. 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
  2.  
  3. Install the camshafts, then install the camshaft seals with the open side facing in. Install the rubber cap with liquid gasket applied.
  4.  
  5. Install a new O-ring and the dowel pin to the oil passage of the No. 3 camshaft holder.
  6.  
  7. Apply liquid gasket to the head of the mating surfaces of the No. 1 and No. 5 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.
     

  8.  
  9. Tighten the camshaft holders temporarily. Be sure that the rocker arms are properly positioned on the valve stems.
  10.  
  11. Tighten the camshaft holder bolts in two steps, following the proper sequence, to ensure that the rockers do not bind on the valves. Tighten the 8x1.25mm bolts to 20 ft. lbs. (27 Nm). Tighten the 6 x 1.0mm bolts to 84 inch lbs. (10 Nm).
  12.  
  13. 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.
  14.  
  15. 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.
  16.  
  17. Adjust the valve clearance.
  18.  
  19. Install the cylinder head cover. Be sure that the seal and groove are thoroughly clean first.
  20.  
  21. 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).
  22.  
  23. Install the distributor to the cylinder head and reconnect the spark plug wires to the spark plugs.
  24.  
  25. Install the intake air duct.
  26.  
  27. Install the strut brace, tighten the nuts to 17 ft. lbs. (24 Nm).
  28.  
  29. Connect the negative battery cable and enter the radio security code.
  30.  
  31. Drain the engine oil. Wait at least 20 minutes before filling the engine with oil; the time delay allows the sealant to cure.
  32.  

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. Remove the air intake duct.
  2.  
  3. Remove the engine ground cable from the cylinder head cover.
  4.  
  5. Remove the connector and the terminal from the alternator, then remove the engine wiring harness from the valve cover.
  6.  
  7. Remove the ignition coil.
  8.  
  9. Label, then detach the electrical connectors from the distributor and the spark plug wires from the spark plugs. Mark the position of the distributor and remove it from the cylinder head. Disconnect the ignition coil wire from the distributor.
  10.  
  11. Remove the Positive Crankcase Ventilation (PCV) hose, then remove the cylinder head cover. Replace the rubber seals if damaged or deteriorated.
  12.  
  13. Remove the timing belt middle cover.
  14.  
  15. Ensure the words UP embossed on the camshaft pulleys are aligned in the upward position.
  16.  
  17. Mark the rotation of the timing belt if it is to be used again. Loosen the timing belt adjusting nut 1 / 2 turn, then release the tension on the timing belt. Push the tensioner to release tension from the belt, then tighten the adjusting nut.
  18.  
  19. Remove the timing belt from the camshaft sprockets.
  20.  


WARNING
Do not crimp or bend the timing belt more than 90° or less, then 1 in. (25mm) in diameter See Figure 8



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Fig. Fig. 8: Exploded view of the cylinder head and related components-2.3L engine

  1. Remove the side engine mount bracket, then the timing belt back cover from behind the camshaft sprockets.
  2.  
  3. Loosen all of the rocker arm adjusting screws, then remove the pin punches from the camshaft caps.
  4.  
  5. Remove the camshaft holders, note the holders locations for ease of installation. Loosen the bolts in the reverse order of the installation.
  6.  
  7. Remove the camshafts from the cylinder head, then discard the camshaft seals.
  8.  
  9. Remove the rubber cap from the head, located at the end of the intake camshaft.
  10.  
  11. Remove the rocker arms from the cylinder head. Note the locations of the rocker arms.
  12.  

The rocker arms have to be installed to their original locations if being reused.

To install:
  1. Lubricate the rocker arms with clean oil, then install the rocker arms on the pivot bolts and the valve stems. If the rocker arms are being reused, install them to their original locations. The lock nuts and adjustment screws should be loosened before installing the rocker arms.
  2.  
  3. Lubricate the camshafts with clean oil.
  4.  
  5. Install the camshaft seals to the end of the camshafts that the timing belt sprockets attach to. The open side (spring) should be facing into the cylinder head when installed.
  6.  
  7. Be sure the keyways on the camshaft is facing up and install the camshaft to the cylinder head.
  8.  
  9. Apply liquid gasket to the head mating surfaces of the No. 1 and No. 5 camshaft holders, then install them along with No. 2, 3 and 4.
  10.  
  11. Snug the camshaft holders in place.
  12.  
  13. Press the camshaft seals securely into place.
  14.  
  15. Tighten the camshaft holder bolts in two steps, following the proper sequence, to ensure that the rockers do not bind on the valves. Tighten all the 6 mm bolts to 104 inch lbs. (12 Nm). Tighten the 8 mm bolts to 16 ft. lbs. (22 Nm).
  16.  

See Figure 9

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Fig. Fig. 9: Camshaft holder torque sequence-2.3L engine

  1. Install the timing belt back cover.
  2.  
  3. 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).
  4.  
  5. Push the camshaft sprocket onto the camshaft, then tighten the retaining bolt to 43 ft. lbs. (59 Nm).
  6.  
  7. Ensure the words UP embossed on the camshaft pulley is aligned in the upward position. Install the timing belt to the camshaft sprocket.
  8.  

See Figure 10

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Fig. Fig. 10: Camshaft sprocket alignment-2.3L engine

  1. Loosen, then tighten the timing belt adjuster nut.
  2.  
  3. Turn the crankshaft counterclockwise until the cam pulley has moved 3 teeth; this creates tension on the timing belt. Loosen, then tighten the adjusting nut and tighten it to 33 ft. lbs. (45 Nm).
  4.  
  5. Adjust the valves.
  6.  
  7. Tighten the crankshaft pulley bolt to 181 ft. lbs. (250 Nm).
  8.  
  9. Install the middle timing belt cover and tighten the attaching bolts to 104 inch lbs. (12 Nm).
  10.  
  11. Install the cylinder head cover and tighten the cap nuts to 104 inch lbs. (12 Nm). Install the PCV hose to the cylinder head cover.
  12.  
  13. Install the distributor to the cylinder head.
  14.  
  15. Connect the spark plug wires to the correct spark plugs, then attach the distributor electrical connectors. Install the ignition coil wire to the distributor.
  16.  
  17. Install the ignition coil.
  18.  
  19. Install the alternator wiring harness to the cylinder head cover, then attach the terminal and connector to the alternator.
  20.  
  21. Connect the engine ground cable to the cylinder head cover.
  22.  
  23. Install the air intake duct.
  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. Connect the negative battery cable and enter the radio security code.
  28.  
  29. Start the engine, checking carefully for any leaks.
  30.  
  31. Enter the radio security code.
  32.  

2.5L Engine

  1. Disconnect the negative battery cable. Remove the timing belt covers and cylinder head covers.
  2.  
  3. Rotate the crankshaft to Top Dead Center (TDC) compression of No. 1 piston and remove the timing belt.
  4.  
  5. Remove the camshaft sprocket.
  6.  
  7. Remove the cylinder head from the vehicle.
  8.  
  9. Loosen the rocker shaft holder bolts 1 turn at a time in the opposite of the installation sequence. Following this procedure will prevent the camshafts and rocker assemblies from warping.
  10.  
  11. After all bolts are loose, remove the rocker arm shafts as an assembly with the bolts still in the holders.
  12.  
  13. If the rocker shafts are to be disassembled, note that each rocker arm has a letter A or B stamped into the side. Before disassembling the rocker arms, make a note of the position of each letter so the arms can be reassembled the same way. The springs between the rocker arms are not all the same length. Carefully note their positions during disassembly.
  14.  

To install:

See Figure 11

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Fig. Fig. 11: Camshaft and rocker arm assembly-2.5L engine

  1. Lubricate the camshaft and its journals with fresh engine oil.
  2.  
  3. Place a new camshaft seal on the end of the camshaft. The spring side of the seal must face in. Lubricate the journals and set the camshaft in place on the head.
  4.  
  5. Install the camshaft onto the cylinder head with the keyway pointed up.
  6.  
  7. Apply liquid gasket to the mounting surfaces of the camshaft end holders.
  8.  
  9. Set the rocker arm assemblies in place and start all the cam holder bolts. Be sure the rocker arms are properly positioned and turn each bolt in sequence two turns at a time until the holders are seated on the head. Follow this procedure to avoid damaging the camshaft and rocker assemblies.
  10.  
  11. When all of the camshaft and rocker holders are seated, tighten the bolts in the same sequence. Tighten the 8mm bolts to 16 ft. lbs. (22 Nm) and the 6mm bolts to 104 inch lbs. (12 Nm).
  12.  
  13. Install the cylinder head.
  14.  
  15. Install the camshaft sprocket and tighten the bolts to 51 ft. lbs. (70 Nm).
  16.  
  17. Install the timing belt, adjust the valves and oil the camshaft before completing the assembly.
  18.  
  19. Install the cylinder head cover and timing cover.
  20.  
  21. Install the distributor.
  22.  
  23. Reconnect the negative battery cable.
  24.  
  25. Check for proper engine and valve train operation.
  26.  

3.0L Engine

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the timing belt and cylinder head as outlined earlier in this section.
  4.  
  5. Remove the camshaft sprocket and rear cover.
  6.  
  7. Remove the rocker arm/shaft assembly.
  8.  
  9. Remove the camshaft thrust cover and O-ring.
  10.  
  11. Carefully pull out the camshaft.
  12.  

See Figure 12

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Fig. Fig. 12: Camshaft installation-3.0L engine

To install:
  1. Lubricate the camshaft with clean engine oil.
  2.  
  3. Carefully slide the camshaft into position.
  4.  
  5. Install the thrust plate using a new O-ring. Tighten the bolts to 16 ft. lbs. (22 Nm).
  6.  
  7. Install the rocker arm/shaft assembly.
  8.  
  9. Install the cylinder head.
  10.  
  11. Install the rear cover and camshaft sprocket. Tighten the bolt to 67 ft. lbs. (90 Nm).
  12.  
  13. Install the timing belt.
  14.  
  15. Adjust the valves.
  16.  

3.2L and 3.5L Engines

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the timing belt covers and cylinder head covers.
  4.  
  5. Rotate the crankshaft to Top Dead Center (TDC) for the No. 1 piston and remove the timing belt.
  6.  
  7. Remove the camshaft sprockets.
  8.  
  9. Loosen the rocker shaft holder bolts one turn at a time in the reverse of the torque sequence to avoid damaging the valves, camshafts, or rocker assemblies.
  10.  
  11. After all bolts are loose, remove the rocker arm shafts as an assembly with the bolts still in the holders.
  12.  

See Figures 13 and 14

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Fig. Fig. 13: Loosen the camshaft holder bolts in the specified sequence-3.5L engine



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Fig. Fig. 14: Camshaft and rocker arm assembly-3.2L engines

  1. If the rocker shafts are to be disassembled, note that each rocker arm has a letter A or B stamped into the side. Before disassembling the rocker arms, make a note of the position of each letter so that the arms can be reassembled in the same position.
  2.  
  3. Do not remove the hydraulic tappets from the rocker arms unless they are to be replaced. Handle the rocker arms carefully so the oil does not drain out of the tappets.
  4.  
  5. Lift the camshafts from the cylinder head, wipe them clean and inspect the lift ramps. Replace the camshafts and rockers if the lobes are pitted, scored, or excessively worn.
  6.  

To install:
  1. Place a new seal on the end of the camshaft, lubricate the journals and set the camshaft in place on the head.
  2.  

The pin hole in the front of the camshaft designates the top position.

See Figure 15

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Fig. Fig. 15: Camshaft holder bolt tightening sequence-3.2L engine

  1. Apply liquid gasket to the mounting surfaces of the camshaft end holders.
  2.  
  3. Set the rocker arm assemblies in place and start all of the camshaft holder bolts. Be sure the rocker arms are properly positioned and turn each bolt in sequence two turns at a time until the holders are seated on the head to avoid damaging the valves or rocker assemblies.
  4.  
  5. When all the camshaft and rocker holders are seated, tighten the bolts in the same sequence. Tighten the 8mm bolts to 16 ft. lbs. (22 Nm) and the 6mm bolts to 104 inch lbs. (12 Nm).
  6.  
  7. Install the camshaft pulleys and tighten the bolts to 23 ft. lbs. (32 Nm).
  8.  

See Figure 16

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Fig. Fig. 16: Tighten the camshaft holder bolts in the specified sequence-3.5L engine

  1. Install the timing belt and pour oil over the camshafts.
  2.  
  3. Install the cylinder head cover and reassemble accessory components.
  4.  
  5. Verify that all electrical connections and vacuum lines are connected.
  6.  
  7. Reconnect the negative battery cable.
  8.  
  9. Run the engine and check for leaks and proper operation.
  10.  

INSPECTION 4-Cylinder Engines



  1. Thoroughly clean all parts. Inspect the camshaft journals for scoring. Check the oil feed holes in the cylinder head for blockage. Check the camshaft bearing journals for scoring. If light scratches are present, they may be removed with 400 grit abrasive paper. If deep scratches are present, replace the camshaft and check the cylinder head for damage. Replace the cylinder head if worn or damaged.
  2.  
  3. If the camshaft lobes show signs of wear, check the corresponding rocker arm roller for wear or damage. If the camshaft lobes show signs of pitting on the nose, flank or base circle, replace the camshaft.
  4.  

6-Cylinder Engines

  1. Inspect the camshafts carefully for scratches or worn areas. If light scratches are seen, they may be removed with 400 grit sandpaper. If there are deep scratches, replace the camshaft.
  2.  
  3. Inspect the cylinder head for damage.
  4.  
  5. Check the oil feed holes to make sure they are open and free of debris.
  6.  
  7. If the camshaft lobes show signs of wear, check the corresponding rocker arm roller for wear or damage. Replace the rocker arm if worn or damaged. If the camshaft shows signs of wear on the lobes, replace it.
  8.  
  9. Check camshaft end-play. Oil the camshaft journals with clean engine oil and install the camshaft WITHOUT the rocker arm assemblies. Move the camshaft as far rearward as it will go. Mount a dial indicator to bear on the front of the camshaft. Zero the indicator. Move the camshaft as far forward as it will go. Check to see if the endplay is with in specs.
  10.  

 
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