AutoZone 1980 Mercedes Benz 450SLC 4.5L FI 8cyl | Repair Guides | Engine And Engine Overhaul | Engine Mechanical | Rocker Arm/shafts | AutoZone.com

Search suggestions

    My Vehicles

    1980 Mercedes Benz 450SLC 4.5L FI 8cyl

    My Store

    405 N COLLEGE ST
    (479) 443-4043

    OPEN 'til 10:00 PM today

    Save 20% Sitewide

    Use Code: YOUCHOOSE20

    See Details

    Get A $25 Gift Card

    Use Code: YOUCHOOSE25

    See Details

    Honda - Accord Prelude 1996 2000

    Rocker Arm/Shafts

    Print

    REMOVAL & INSTALLATION



    2.2L (H22A1) Engine


    Click image to see an enlarged view

    Fig. The major carbon build-up on these rocker arms is due to a lack of oil changes at the proper intervals



    Click image to see an enlarged view

    Fig. View of the rocker arm assembly, removed from the vehicle



    Click image to see an enlarged view

    Fig. View of a valve clearance adjusting screw



    Click image to see an enlarged view

    Fig. There may be grooves worn into the bottoms of the rocker arms where they ride on the camshaft if there is a loss of oil pressure



    Click image to see an enlarged view

    Fig. View of the rocker arms as they sit on the shaft



    Click image to see an enlarged view

    Fig. Clean all bolt threads thoroughly before installing the rocker assembly

    1. Disconnect the negative battery cable.
    2.  
    3. Remove the cylinder head from the engine assembly, as outlined later in this section.
    4.  
    5. Remove the VTEC solenoid valve and filter from the cylinder head. Discard the filter.
    6.  
    7. Install rubber bands to each of the rocker arm assemblies, this will hold the rocker arms together and prevent them from separating.
    8.  
    9. Remove the intake and exhaust rocker shaft orifices. The intake and exhaust shaft orifices are different, note their locations for installation.
    10.  
    11. Remove the rocker arm shaft sealing bolts from the cylinder head. Discard the washers.
    12.  
    13. Install 12mm bolts into the rocker arm shafts. Remove each rocker arm while slowly pulling out the intake and exhaust rocker arm shafts.
    14.  
    15. Remove the lost motion assemblies from the cylinder head and inspect it. Pushing it gently with a finger will cause it to sink slightly. Increasing the force on it will cause it to sink deeper.
    16.  

    To install:

    Clean the rocker shaft orifices and install new O-rings. Clean the rocker arms and the shafts in solvent, dry them, and apply clean oil to any contact surfaces.

    1. Install the lost motion assemblies to the cylinder head.
    2.  
    3. Install the rocker arms to their original locations while passing the rocker arm shaft through the cylinder head.
    4.  
    5. Install the rocker arm shaft orifices. If the holes in the rocker arm shaft and cylinder head are not in line with each other, thread a 12mm bolt into the rocker arm shaft and rotate the shaft. Be sure that the orifices are installed in the correct locations, the intake and exhaust orifices are different. The rocker shafts should not turn if the orifices are installed correctly.
    6.  
    7. Install the rocker arm sealing bolts with new washers and tighten the bolts to 43 ft. lbs. (60 Nm). Remove the rubber bands from the rocker arm assemblies.
    8.  
    9. Install the VTEC solenoid valve with a new filter. Tighten the mounting bolts to 108 inch lbs. (12 Nm).
    10.  
    11. Install the cylinder head onto the engine block.
    12.  
    13. Adjust the valves.
    14.  
    15. Connect the negative battery cable and enter the radio security code.
    16.  
    17. Check and adjust the ignition timing.
    18.  
    19. Run the engine and check for leaks, then road test the vehicle.
    20.  

    2.2L (F22A1, F22A6, F22B1, F22B2) Engines
    1. Disconnect the negative battery cable.
    2.  
    3. Remove the air intake duct.
    4.  
    5. Remove the PCV hose, then remove the rocker arm (valve) cover. Replace the rubber seals if damaged or deteriorated.
    6.  
    7. Remove the timing belt upper cover.
    8.  
    9. Bring the No. 1 cylinder to TDC. The white mark on the crankshaft pulley should align with the pointer on the timing belt cover. The words UP embossed on the camshaft pulley should be aligned in the upward position. The marks on the edge of the pulley should be aligned with the cylinder head or the back cover upper edge. Once in this position, the engine must NOT be turned or disturbed.
    10.  
    11. 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.
    12.  
    13. Loosen the power steering mounting bolts and remove drive belt from the pump.
    14.  
    15. Mark the rotation of the timing belt if it is to be used again. Loosen the timing belt adjusting bolt 3 / 4 -1 turn, then release the tension on the timing belt. Push the tensioner to release tension from the belt, then tighten the adjusting bolt.
    16.  
    17. Remove the timing belt from the camshaft sprocket, as outlined later in this section.
    18.  


    WARNING
    Do not crimp or bend the timing belt more than 90°, or less than 1 inch (25mm) in diameter

    1. Ensure the words UP embossed on the camshaft pulley is aligned in the upward position, then remove the camshaft sprocket bolt. Pull the sprocket from the camshaft and remove the sprocket key.
    2.  
    3. Remove the timing belt back cover.
    4.  
    5. Loosen the valve adjusting screws.
    6.  
    7. Loosen the camshaft holder attaching bolts 2 turns at a time in the proper sequence to prevent damaging the valves or rocker arm assemblies.
    8.  



    Click image to see an enlarged view

    Fig. Rocker arm assembly bolt removal sequence-2.2L (F22A1, F22A6) engines



    Click image to see an enlarged view

    Fig. Rocker arm assembly bolt loosening sequence-2.2L (F22B1) engine



    Click image to see an enlarged view

    Fig. Rocker arm assembly bolt loosening sequence-2.2L (F22B2) engine

    When removing the rocker arm assembly, do not remove the camshaft holder bolts. The bolts will keep the camshaft holders, springs, and the rocker arms on the shafts.

    1. Carefully remove the camshaft holders and rocker arm assembly. If the rocker arm and shaft assembly needs to be disassembled for service, note the location of the components as they are removed. Install a rubber band around the VTEC rocker arm assemblies to keep them from coming apart during disassembly of the rocker arm assembly. The rocker arms must be installed in the same position if reused.
    2.  
    3. Remove the camshaft from the cylinder head and discard the seal.
    4.  
    5. Remove the oil control orifice.
    6.  

    To install:

    1. Wipe the camshaft and the camshaft journals clean, then lubricate both surfaces, and install the camshaft.
    2.  
    3. Turn the camshaft so that its keyway is facing up (No. 1 cylinder will be at TDC).
    4.  
    5. Clean the oil control orifice and install a new O-ring, then install the oil control orifice.
    6.  
    7. Reassemble the rocker arm and shaft assembly, if it was disassembled. Lubricate the rocker arm and shaft assembly with clean oil, then apply liquid gasket to the head mating surfaces of the No. 1 and No. 6 camshaft holders.
    8.  
    9. Set the camshaft holders and rocker arm assembly in place, then loosely install the attaching bolts.
    10.  
    11. Apply clean oil to the camshaft oil seal lip and the seal guide (part # 07NAG-PT0010A), then install the seal to the seal guide. Install the seal guide to the camshaft, then the installer cup (part # 07NAF-PT0010A), and the installer shaft (part # 07NAF-PT0020A). Tighten the nut on the installer shaft to press the seal into the cylinder head.
    12.  
    13. Tighten the camshaft holder bolts 2 turns at a time in the proper sequence, as shown in the accompanying figures. The final torque for the 8mm bolts is 16 ft. lbs. (22 Nm) and the final torque for the 6mm bolts is 108 inch lbs. (12 Nm).
    14.  



    Click image to see an enlarged view

    Fig. Rocker arm assembly torque sequence-2.2L (F22A1, F22A6) engines



    Click image to see an enlarged view

    Fig. Rocker arm assembly torque sequence-2.2L (F22B1) engine



    Click image to see an enlarged view

    Fig. Rocker arm assembly torque sequence-2.2L (F22B2) engine

    1. Install the timing belt back cover and a new gasket, if necessary. Tighten the bolt toward the exhaust manifold to 84 inch lbs. (10 Nm) and tighten the bolt toward the intake manifold to 108 inch lbs. (12 Nm).
    2.  
    3. Install the camshaft sprocket key to the camshaft, then install the camshaft sprocket. Install the bolt and tighten it to 27 ft. lbs. (37 Nm).
    4.  
    5. Ensure the words UP embossed on the camshaft pulley is aligned in the upward position, then install the timing belt onto the camshaft sprocket. Loosen, then tighten the timing belt adjusting nut. Refer to the procedure located in this section.
    6.  
    7. Rotate the crankshaft pulley 5 or 6 turns to position the timing belt on the pulleys.
    8.  
    9. Set the No. 1 cylinder to TDC and loosen the timing belt adjusting nut 1 turn. 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).
    10.  
    11. Adjust the valves.
    12.  
    13. Tighten the crankshaft pulley bolt to 181 ft. lbs. (245 Nm) on (F22B1) engines and 159 ft. lbs. (220 Nm) on all other engines.
    14.  
    15. Install the upper timing belt cover. Tighten the bolt toward the exhaust manifold to 84 inch lbs. (10 Nm) and tighten the bolt toward the intake manifold to 108 inch lbs. (12 Nm).
    16.  
    17. Install the rocker arm (valve) cover gasket cover to the groove of the rocker arm (valve) cover. Before installing the gasket, thoroughly clean the seal and the groove. Seat the recesses for the camshaft first, then work it into the groove around the outside edges. Be sure the gasket is seated securely in the corners of the recesses.
    18.  
    19. Apply liquid gasket to the 4 corners of the recesses of the rocker arm (valve) cover gasket. Do not install the parts if 5 minutes or more have elapsed since applying liquid gasket. After assembly, wait at least 20 minutes before filling the engine with oil.
    20.  
    21. Install the cylinder head (valve) cover. Tighten the bolts attaching the rocker arm (valve) cover in the proper sequence to 84 inch lbs. (10 Nm).
    22.  



    Click image to see an enlarged view

    Fig. Rocker arm (valve) cover torque sequence-2.2L (F22B1) engine



    Click image to see an enlarged view

    Fig. Rocker arm (valve) cover torque sequence-2.2L (F22B2) engine

    1. Install the PCV hose to the rocker arm (valve) cover.
    2.  
    3. Install and adjust the power steering belt.
    4.  
    5. Install the distributor to the cylinder head. Snug the attaching bolts until the timing has been checked and adjusted.
    6.  
    7. Connect the spark plug wires to the correct spark plugs, then connect the distributor electrical connectors.
    8.  
    9. Install the air intake duct.
    10.  
    11. Drain the oil from the engine into a sealable container. Install the drain plug and refill the engine with clean oil.
    12.  
    13. Connect the negative battery cable and enter the radio security code.
    14.  
    15. Start the engine and check carefully for any leaks.
    16.  
    17. Check and adjust the ignition timing as necessary, then tighten the distributor bolts to 13 ft. lbs. (18 Nm).
    18.  

    2.3L Engine
    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 TDC 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 rocker arm (valve) 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 PCV hose, then remove the rocker arm (valve) 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. Refer to the procedure located in this section.
    20.  


    WARNING
    Do not crimp or bend the timing belt more than 90°, or less than 1 inch (25mm) in diameter

    1. Insert a 5.0mm pin punch in each of the camshaft caps, nearest to the sprockets, through the holes provided. Remove the camshaft sprocket attaching bolts, then remove the sprockets. Do not lose the sprocket keys.
    2.  
    3. Remove the side engine mount bracket B, then the timing belt back cover from behind the camshaft sprockets.
    4.  
    5. Loosen all of the rocker arm adjusting screws, then remove the pin punches from the camshaft caps.
    6.  
    7. Remove the camshaft holders. Note the holders locations for ease of installation. Loosen the bolts in the reverse order of the holder bolts torque sequence.
    8.  
    9. Remove the camshafts from the cylinder head, then discard the camshaft seals.
    10.  
    11. Remove the rubber cap from the head, located at the end of the intake camshaft.
    12.  
    13. Remove the rocker arms from the cylinder head. Note the locations of the rocker arms.
    14.  

    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 locknuts 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 camshafts are facing up and install the camshafts to the cylinder head.
    8.  
    9. Install the rubber plug to the cylinder head at the end of the intake camshaft.
    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. I or E marks are stamped on the camshaft holders to identify them as Intake or Exhaust side holders. The arrows stamped on the holders should point toward the timing belt.
    12.  
    13. Snug the camshaft holders in place.
    14.  
    15. Press the camshaft seals securely into place.
    16.  
    17. Tighten the camshaft holder bolts in 2 steps, following the proper sequence, to ensure that the rockers do not bind on the valves. Tighten all the bolts, except the 4 studs, to 84 inch lbs. (10 Nm). Tighten the studs (number 5 and 7 bolts in the correct sequence) to 108 inch lbs. (12 Nm).
    18.  



    Click image to see an enlarged view

    Fig. Camshaft holders 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. Insert a 5.0mm pin punch in each of the camshaft caps, nearest to the pulleys, through the holes provided. Install the keys into the camshaft grooves.
    6.  
    7. Push the camshaft sprockets onto the camshafts, then tighten the retaining bolts to 27 ft. lbs. (38 Nm).
    8.  
    9. Ensure the words UP embossed on the camshaft pulleys are aligned in the upward position. Install the timing belt to the camshaft sprockets, then remove the 2, 5.0mm pin punches from the camshaft bearing caps. Refer to the procedure located in this section.
    10.  
    11. Loosen, then tighten the timing belt adjuster nut.
    12.  
    13. 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).
    14.  
    15. Adjust the valves.
    16.  
    17. Tighten the crankshaft pulley bolt to 181 ft. lbs. (250 Nm).
    18.  
    19. Install the middle timing belt cover and tighten the attaching bolts to 108 inch lbs. (12 Nm).
    20.  
    21. Install the rocker arm (valve) cover and tighten the cap nuts to 84 inch lbs. (10 Nm). Install the PCV hose to the rocker arm (valve) cover.
    22.  
    23. Install the distributor to the cylinder head. Snug the attaching bolts until the timing has been checked and adjusted.
    24.  
    25. Connect the spark plug wires to the correct spark plugs, then attach the distributor electrical connectors. Install the ignition coil wire to the distributor.
    26.  
    27. Install the ignition coil.
    28.  
    29. Install the alternator wiring harness to the rocker arm (valve) cover, then connect the terminal and connector to the alternator.
    30.  
    31. Connect the engine ground cable to the rocker arm (valve) cover.
    32.  
    33. Install the air intake duct.
    34.  
    35. Drain the oil from the engine into a sealable container. Install the drain plug and refill the engine with clean oil.
    36.  
    37. Connect the negative battery cable and enter the radio security code.
    38.  
    39. Start the engine and check carefully for any leaks.
    40.  
    41. Check and adjust the ignition timing. Tighten the distributor bolts to 13 ft. lbs. (18 Nm).
    42.  

    2.7L Engine
    1. Disconnect the negative battery cable.
    2.  
    3. Remove the timing belt covers and the timing belt. Refer to the procedure located in this section.
    4.  
    5. Remove the camshafts from the cylinder heads.
    6.  
    7. Remove the intake rocker arms, exhaust inside rocker arms and the pushrods. Identify the location of the parts as they are removed, to ensure reinstallation to the original locations.
    8.  
    9. Remove the valve lifters (hydraulic tappets) from the cylinder heads.
    10.  
    11. Remove the intake manifold, then the cylinder heads from the vehicle.
    12.  
    13. Remove the rocker arm shaft sealing bolt from the cylinder head and discard the washer.
    14.  
    15. Install a 12 x 1.25mm bolt into the rocker arm shaft. Slowly remove the shaft from the cylinder head and remove the exhaust rocker arms and washers. Identify the location of the parts as they are removed, to ensure reinstallation to the original locations.
    16.  



    Click image to see an enlarged view

    Fig. Exhaust rocker arms and rocker arm shaft component locations-2.7L engine

    To install:

    1. Clean the rocker arms and rocker arm shafts in solvent and dry them, then oil the contact surfaces of the parts.
    2.  
    3. Install a 12 x 1.25mm bolt into the rocker arm shaft. Install the rocker arms to their original locations while passing the rocker arm shaft through the cylinder head.
    4.  
    5. Remove the bolt from the rocker arm shaft and install the sealing bolt with a new washer. Tighten the sealing bolt to 33 ft. lbs. (44 Nm).
    6.  
    7. Install the cylinder heads and the intake manifold.
    8.  
    9. Fill the valve lifter (hydraulic tappets) mounting hole and the oil fillers with clean engine oil.
    10.  
    11. Install the valve lifters.
    12.  


    WARNING
    Do not rotate the valve lifters while installing them.

    1. Apply clean engine oil to the rocker arms, pushrods, and the camshafts.
    2.  
    3. Loosen the exhaust rocker arm adjusting screws and locknuts, then install the pushrods, exhaust inside rocker arms, and the intake rocker arms. Install the parts to their original locations.
    4.  
    5. Be sure the rocker arms are properly positioned on the valve stems. Advance the crankshaft 30° from Top Dead Center (TDC) to prevent interference between the pistons and valves when the camshafts are installed.
    6.  
    7. Install the camshafts and camshaft holders.
    8.  
    9. Install the timing belt and set No. 1 cylinder to TDC.
    10.  
    11. Tighten the adjusting screws for No. 1, No. 2 and No. 4 cylinders. Tighten the screw until it contacts the valve, then tighten the screw 1 turn. Hold the screw in place and tighten the locknut to 14 ft. lbs. (20 Nm).
    12.  
    13. Rotate the crankshaft pulley 1 turn clockwise, then tighten the adjusting screws for No. 3, No. 5 and No. 6 cylinders. Tighten the screw until it contacts the valve, then tighten the screw 1 1 / 8 turns. Hold the screw in place and tighten the locknut to 14 ft. lbs. (20 Nm).
    14.  



    Click image to see an enlarged view

    Fig. Timing marks for valve adjustment for cylinders 3, 5 and 6-2.7L engine

    1. Install the cylinder head gasket into the groove of the rocker arm (valve) cover. Seat the recesses for the camshaft first, then work it into the groove around the outside edges.
    2.  

    Before installing the rocker arm (valve) cover gasket, thoroughly clean the seal groove.

    1. Apply liquid gasket to the rocker arm (valve) cover gasket at the 4 corners of the recesses. Use a shop towel and wipe the cylinder heads where the rocker arm (valve) covers will come in contact.
    2.  
    3. Install the rocker arm (valve) covers, hold the gasket in the groove by placing your fingers on the camshaft contacting surfaces. With the rocker arm (valve) cover on the cylinder heads, slide the covers slightly back and forth to seat the rocker arm (valve) cover gaskets. Replace the washers if damaged or deteriorated
    4.  
    5. Install the cylinder head side covers with new O-rings and tighten the bolts to 108 inch lbs. (12 Nm).
    6.  
    7. Tighten the rocker arm (valve) cover bolts in 2 or 3 steps. In the final step, tighten all the bolts, in sequence, to 11 ft. lbs. (15 Nm).
    8.  



    Click image to see an enlarged view

    Fig. Rocker arm (valve) cover torque sequence-2.7L engine

    1. Install the distributor to the cylinder head and tighten the mounting bolt to 16 ft. lbs. (22 Nm).
    2.  
    3. Connect the spark plug wires to the correct spark plugs, then attach the distributor electrical connectors.
    4.  
    5. Drain the engine oil into a sealable container, then refill the engine with clean oil.
    6.  
    7. Connect the negative battery cable and enter the radio security code.
    8.  
    9. Start the engine, allowing it to idle, and check for any signs of leakage.
    10.  

    3.0L Engine
    1. Remove the valve (cylinder head) cover, as outlined earlier in this section.
    2.  
    3. Loosen the jam nuts on the adjusters, then back out the screws.
    4.  
    5. Loosen the rocker arm shaft bolts 2 turns at a time in the sequence shown.
    6.  
    7. Lift the rocker arm assembly from the cylinder head. Leave the bolts in the shafts to retain the rocker arms and springs.
    8.  



    Click image to see an enlarged view

    Fig. Be sure to loosen the rocker arm shaft bolts in the correct order as shown-3.0L engine



    Click image to see an enlarged view

    Fig. Exploded view of the rocker arms and related components-3.0L engine

    To install:

    1. Clean all parts in solvent, dry with compressed air and lubricate with clean engine oil.
    2.  
    3. Place the rocker arm assemblies on the cylinder head and install the bolts loosely. Be sure that all rocker arms are in alignment with their valves.
    4.  
    5. Tighten each bolt 2 turns at a time in the correct sequence. Tighten the bolts to 17 ft. lbs. (24 Nm).
    6.  
    7. Adjust the valves and install the rocker arm (valve) covers.
    8.  



    Click image to see an enlarged view

    Fig. Tighten the rocker arm bolts 2 turns at a time in the sequence shown-3.0L engine

     
    AutoZone Logo