Mechanics

CHEVROLET LUMINA ROCKER ARM PROBLEM

1991 Chevrolet Lumina • 291,868 miles

I have a 1991 Chevrolet Lumina with a 3.1L V6. The timing chain broke and valves were bent. Instill of having to have the heads repaired, I brought a set of Remanufactured Heads with new valves installed. Yesterday I finally got around and installed the new heads. Today when I started to adjust the valves, I ran into the following problem. There is not enough threads on the Rocker Arm Studs to adjust the valves, while rotating the pushrods until valve lash is eliminated. I found out today that the original heads on my car came with rocker arm studs (valves) that were not adjustable. The rocker arm studs on the old heads are taller than the rocker arm studs on the new heads. How do I fix this problem? Do I need to buy some Adjustable Rocker Arm Studs to replace the Short Rocker Arm Studs on the new heads?
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Pilotbill
November 9, 2012.



I DON'T KNOW YOUR ENGINE

I DID A LITTLE INVESTIGATION

YOUR ENGINE HAS THESE ACCORDING TO AUTO ZONE

http://www.autozone.com/autozone/parts/Melling-Valve-Lifter/1991-Chevrolet-Lumina-Sedan-Coupe/_/N-itf1eZ8zna1?itemIdentifier=754424_28199_1667_

MY '77 JEEP CJ 5 HAS 'EM TOO (NOT THE SAME ONES, BUT DO THE SAME JOB)

I WOULD THINK IT WOULD HAVE TAPPETS/ HYDRAULIC LIFTERS ON TOP OF THE CAM

CHECK YOUR REPAIR MANUAL

I WOULD "GUESS" YOU WOULD TORQUE DOWN ALL OF YOUR ROCKERS (NOT TRYING TO ADJUST THEM)----AND WHEN THE TAPPETS DROP INTO THEIR PRESSURIZED OIL GALLEY THEY WOULD SELF ADJUST, WHEN THE ENGINE BUILDS OIL PRESSURE

DID YOU LOOK AT THE OLD HEADS TO SEE IF THEY WERE TORQUED DOWN (NOT DANGLING IN MID-AIR ON A STUD????)

LOOK AT YOUR MANUAL TO CONFIRM THIS

THE MEDIC

http://www.2carpros.com/questions/2007-ford-taurus-tune-up

Tiny
CJ MEDEVAC
Nov 9, 2012.