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How to adjust rocker arm on a 97 chevy Tahoe 5.7

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Posted on Jan 02, 2017

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jturcotte
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SOURCE: Rocker arm torque specs on a 97 gmc jimmy 4.3

  1. For the 4.3L engines which are equipped with screw-in type rocker arm studs with positive stop shoulders, tighten the rocker arm adjusting nuts against the stop shoulders to 20 ft. lbs. (27 Nm) on 1994-96 models and 18 ft. lbs. (25 Nm) on 1997-99 models. No further adjustment is necessary, or possible.
  2. For most 4.3L engines which are not equipped with screw-in type rocker arm studs and positive stop shoulders, properly adjust the valve lash. For details on valve lash adjustment, please refer to the procedure in Routine Maintenance . (see below)
4.3L Engine

The 4.3L engines may be equipped with either of 2 rocker arm retaining systems. If your engine utilizes screw-in type rocker arm studs with positive stop shoulders, no valve lash adjustment is necessary or possible. If however, you engine utilizes the pressed-in rocker arm studs, use the following procedure to tighten the rocker arm nuts and properly center the pushrod on the hydraulic lifter:
  1. To prepare the engine for valve adjustment, rotate the crankshaft until the mark on the damper pulley aligns with the 0? mark on the timing plate and the No. 1 cylinder is on the compression stroke. You will know when the No. 1 piston is on it's compression stroke because both the intake and exhaust valves will remain closed as the crankshaft damper mark approaches the timing scale.

Another method to tell when the piston is coming up on the compression stroke is by removing the spark plug and placing your thumb over the hole, you will feel the air being forced out of the spark plug hole. Stop turning the crankshaft when the TDC timing mark on the crankshaft pulley is directly aligned with the timing mark pointer or the zero mark on the scale.
The valve arrangement is as follows:



E-I-I-E-I-E (right bank-front-to-rear) E-I-E-I-I-E (left bank-front-to-rear)

  1. With the engine on the compression stroke, adjust the exhaust valves of cylinders No. 1, 5 & 6 and the intake valves of cylinders No. 1, 2 & 3 by performing the following procedures:
    1. Back out the adjusting nut until lash can be felt at the pushrod.
    2. While rotating the pushrod, turn the adjusting nut inward until all of the lash is removed.
    3. When the play has disappeared, turn the adjusting nut inward 1 3 / 4 additional turns.

  2. Rotate the crankshaft one complete revolution and align the mark on the damper pulley with the 0? mark on the timing plate; the engine is now positioned on the No. 4 firing position. This time the No. 4 cylinder valves remain closed as the timing mark approaches the scale. Adjust the exhaust valves of cylinders No. 2, 3 & 4 and the intake valves of cylinders No. 4, 5 & 6, by performing the following procedures:
    1. Back out the adjusting nut until lash can be felt at the pushrod.
    2. While rotating the pushrod, turn the adjusting nut inward until all of the lash is removed.
    3. When the play has disappeared, turn the adjusting nut inward 1 3 / 4 additional turn.

Posted on Sep 23, 2010

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1 Answer

Need torque on 1997 chevy tahoe 5.7 rocker arm torque


The rocker arms need to be adjusted, they are not set to a specific torque, they use self locking "crimp" nuts to hold the adjustment, these nuts should not be used over to hold the adjustment replace them.. With the lifters fully "pumped" up tighten the rocker arms to "zero" lash, the turn them in an additional 3/4 turn, you are done.

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1997 chevy tahoe 5.7 need rocker arm torque


This is and adjustable valve lash engine. There is no actual torque. I'm attaching a video that explains it way better than I can in this post.

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There is no adjustment ,
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according to several searches on this subject:
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well first you need to know the firing order...if it's a small block chevy the firing order is 18436572. You need to write the second four digits underneath the first four digits.

so it looks like this 1843
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This will let you know which rocker to adjust...turn the engine over by hand using a rachet on the crank shaft bolt by the harmonic balancer until you get both rockers for number 6 cylinder moving at the same time. Now you may adjust the clearance for both rocker for number 1 cylinder. Then crank the engine over by hand again until number 5 cylinder rockers start to move. Now you can adjust the clearance on number 8 cylinder. You will need to know the manufacturer specs for the valve clearance...continue until all rockers have been adjusted.

Note: The engine should be warm when you make the adjustment.

please rate this.

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