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.
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:
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:
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:
Back out the adjusting nut until lash can be felt at the pushrod.
While rotating the pushrod, turn the adjusting nut inward until all of the lash is removed.
When the play has disappeared, turn the adjusting nut inward 1 3 / 4 additional turns.
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:
Back out the adjusting nut until lash can be felt at the pushrod.
While rotating the pushrod, turn the adjusting nut inward until all of the lash is removed.
When the play has disappeared, turn the adjusting nut inward 1 3 / 4 additional turn.
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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.
There is no adjustment ,
Install the rocker arm and the ball.
Apply Dri-Slide Moly lubricant GM P/N 1052948 or equivalent to the threads of the stud.
Install the rocker arm nuts.
Tighten
Tighten the nuts to 30 N·m (22 lb ft).
according to several searches on this subject:
your valves require no additional adjustment.
Install pushrod and rocker arms and rocker arm nuts. Tighten nuts to 22 ft. lbs. (30 Nm).
When searching for rocker arm adjustment on 1998 s10 and you come across search result in googles main searches titled " rocker arm adjustment on 1998 chevy s10 2.2- one would usually expect the search result to at least mention the year/vehicle and correct engine size somewhere on the page! But to appear in search as " rocker arm adjustment 1998 s10 2.2" then as soon as you get to page it suddenly only mentions the 4.3, or chevy impala, IS NOT THE SAME AS THE LYING DECEIVING SEARCH RESULT STATED! Results like this should be removed!!
VALVE ADJUSTMENTS
All gasoline and diesel engines in this guide use hydraulic valve lifters, which require no periodic maintenance or adjustment. However, in the event of cylinder head removal or any operation that requires disturbing or removing the rocker arms, the rocker arms must be adjusted in order to position the pushrods to allow the hydraulic lifters to maintain zero lash.
Refer to the valve lash adjustment procedure under Rocker Arms, earlier in this Section.
if the car has variable valve timing then yes you cant adjust rocker arms they are set with the timing and are probaly hydrolic not mechcanical good luck
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