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Bob, Auto Tech
Category: Chevy
Satisfied Customers: 4087
Experience:  Plus 40 years GM, over 30 certified with Chevrolet, ASE certified Master Tech. (Expired, Retired)
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How do I adjust the rocker arms on a 1997 S10 Blazer ...

Resolved Question:

How do I adjust the rocker arms on a 1997 S10 Blazer with the 4.3 V6?
Submitted: 9 years ago.
Category: Chevy
Expert:  Bob replied 9 years ago.

The post below should have everything you need. Thanks

  1. Adjust the valves on V8 and V6 engines as follows:
    1. Crank the engine until the mark on the damper aligns with the TDC or 0 degree mark on the timing tab and the engine is in the No. 1 firing position. This can be determined by placing the fingers on the No. 1 cylinder valves as the marks align. If the valves do not move, it is in the No. 1 firing position. If the valves move, it is in the No. 6 firing position (no. 4 on V6) and the crankcase should be rotated one more revolution to the No. 1 firing position.
    2. With the engine in the No. 1 firing position, the following valves can be adjusted:
    • V8: Exhaust 1, 3, 4, 8
    • V8: Intake 1, 2, 5, 7
    • V6: Exhaust 1, 5, 6
    • V6: Intake 1, 2, 3
    1. Back out the adjusting nut until lash is felt at the pushrod, then turn the adjusting nut in until all lash is removed. This can be determined by checking pushrod end-play while turning the adjusting nut. When all play has been removed, turn the adjusting nut in:
    • 1/2-11/4 additional turn (flat lifter)
    • 3/4-11/4 additional turn (roller lifter V8)
    • 3/4 additional turn (roller lifter V6)
    1. Crank the engine 1 full revolution until the marks are again in alignment. This is the No. 6 firing position (no. 4 on V6). The following valves can now be adjusted:
    • V8: Exhaust 2, 5, 6, 7
    • V8: Intake 3, 4, 6, 8
    • V6: Exhaust 2, 3, 4
    • V6: Intake 4, 5, 6
  1. Reinstall the rocker arm covers using new gaskets or sealer.
  2. If applicable, install the distributor cap and wire assembly.
  3. Adjust the idle speed.
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