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    1957 Chevrolet One-Fifty 4.3L 2BL OHV 8cyl

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    405 N COLLEGE ST
    (479) 443-4043

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    Use Code: SEECLEAR

    See Details

    GM Camaro/Firebird 1993-1998 Repair Guide

    Rocker Arms

    Print

    REMOVAL & INSTALLATION



    See Figures 1, 2, 3 and 4

    Click image to see an enlarged view

    Fig. Fig. 1: Exploded view of common rocker arm components

    Be sure to keep all the components in the exact order of removal so they may be installed in there original location; adjust the valve lash after replacing the rocker arms. Coat the replacement rocker arm and ball with engine oil before installation.

    Rocker arms studs that have damaged threads or are loose in the cylinder heads may be replaced by reaming the bore and installing oversize studs. Oversizes available are 0.003 in. (0.076mm) and 0.013 in (0.33mm). The bore may also be tapped and screw-in studs installed. Several aftermarket companies produce complete rocker arm stud kits with installation tools.

    The 3.4L and 5.7L engines use press fit studs.

    1. Disconnect the negative battery cable.
    2.  
    3. Remove the rocker arm cover as outlined in this section
    4.  
    5. Remove the rocker arm nuts, balls and rocker arms. Place components in a rack so they can be reinstalled in the same location.
    6.  



    Click image to see an enlarged view

    Fig. Fig. 2: After the valve cover is removed, unfasten the rocker arm retaining nut



    Click image to see an enlarged view

    Fig. Fig. 3: Remove the rocker arm and ball



    Click image to see an enlarged view

    Fig. Fig. 4: If necessary, remove the pushrods and place them in a labeled holder

    To install:
    1. Coat the bearings surfaces with a thin coating of Molykote or its equivalent.
    2.  
    3. Install the pushrods and make sure the rod is in the lifter seat.
    4.  
    5. Install the rocker arm, balls and nut. Tighten the nut until all lash is eliminated.
    6.  
    7. The engine must be on the No. 1 firing position before proceeding. This may be determined by placing your fingers on the No. 1 rocker arms as the mark crankshaft damper is rotated towards the "0" on the timing tab. If the arms did not move, it is in the No. 1 firing position. If they did move, turn the crankshaft one full revolution to reach the No. 1 position. Remember, the mark on the crankshaft balancer must be aligned with the "0" on the timing tab.
    8.  
    9. Adjust the valves as follows:
    10.  

    V6 ENGINES

    With the engine on the number 1 firing position, exhaust valves 1, 2 and 3 and intake valves 1, 5 and 6 may be adjusted. Back out the adjusting nut until lash is felt at the pushrod. Tighten the adjusting nut until all lash is removed, then tighten the nut an additional 1 1 / 2 turns to center the lifter plunger. Turn the engine one revolution until the "0" timing mark is once again aligned. Exhaust valves 4, 5 and 6 and intake valves 2, 3 and 4 may be adjusted.

    V8 ENGINES

    With the engine on the number 1 firing position, exhaust valves 1, 3, 4 and 8, intake valves 1, 2, 5 and 7 may be adjusted. Back out the adjusting nut until lash is felt at the pushrod. Tighten the adjusting nut until all lash is removed, then tighten an additional 1 turn to center the lifter plunger. Turn the engine one revolution until the 0 timing mark is once again aligned. Exhaust valves 2, 5, 6 and 7, intake valves 3, 4, 6 and 8 may be adjusted.

    1. Install the rocker arm cover.
    2.  
    3. Connect the negative battery cable.
    4.  

     
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