Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
1-2-3-4-5-6 Distributor rotation: clockwise
These engines utilize hydraulic valve lifters which means that a valve adjustment is NOT a regular maintenance item. The valves must only be adjusted if the rockers arms have been disturbed for any reason such as cylinder head, camshaft, pushrod or lifter removal.
If working on the 2.8L engine, adjust the intake valves of cylinders No. 1, 5 & 6 and the exhaust valves of cylinders No. 1, 2 & 3. To adjust the valves, back-out the adjusting nut until lash can be felt at the push rod, then turn the nut until all of the lash is removed.
To determine if all of the lash is removed, turn the push rod with your fingers until the movement is removed. When all of the lash has been removed, turn the adjuster an additional 11/2 turns; this will center the lifter plunger.
Rotate the crankshaft one complete revolution and realign the timing marks; 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.
If working on the 2.0L engine, adjust the intake valves of cylinders No. 3 & 4 and the exhaust valves of cylinders No. 2 & 4.
If working on the 2.8L engine, adjust the intake valves of cylinders No. 2, 3 & 4 and the exhaust valves of cylinders No. 4, 5 & 6.
Once the valves are properly set, install the remaining components
need help on a 1999 Chevy K3500 pickup with a 7.4 L