Question about 1997 Chevrolet C1500
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Posted on Jan 02, 2017
Crank the engine until the mark on the damper aligns with the TDC mark on the timing tab and the engine is in #1 firing position.
To adjust a valve back off the adjusting nut until lash is felt at the pushrod. Tighten the nut until all lash is removed. This can be determined by rotating the pushrods with your fngers. When all lash is removed the pushrod will stop rotating. When all play is removed rotate the nut one full turn.
With the engine in #1 firing position the following valves can be adjusted:
Crank engine one full revolution - The following valves can now be adjusted:
Posted on Jul 25, 2009
yeah it needs a new cylinder I see this all the time. The valve stem guide in the head drops and sticks the valve open the rocker and cam lose tension and thats why the rocker keeps breaking. Take the valve cover off the head that your have problems with. remove the rocker put a socket over the valve spring. gently tap the spring down without loosening the keepers. You will notice that the valve will not return to the closed position. I garuntee this is the problem u r have I hate to give u the bad news.
Posted on Nov 05, 2009
Most of the vortecs that i have worked on have hydraulic roller lifters, but i cant say for certain that your engine does, however i am sure that it has hydraulic lifters and they can be checked by trying to push them down in the center where the pushrods contact, if they compress easily the lifter is bad, If they are roller lifters, check for any wear on the roller and how well they turn, it is ok to have some side to side movement on the pin but any up/down movement on the roller is bad. If the are non-roller lifters check for wear, if the lifter looks "dished" or "concaved" rather than having flat surface replace the lifter.
Posted on Jan 23, 2010
as long as the oil system was primed and the lifters are full tighten each rocker down until it is snug enough that you can't move it with your fingers.put the valve covers back on and run the motor for a couple minutes. then run the motor with one of the valve covers off at a time. it can be a little messy but this is the best way. as the motor is running loosen each rocker nut until you hear chatter then tighten it back down until it stops plus one quarter turn. this is the best way I know to make sure they are just right.
Posted on Feb 27, 2010
As far as I know all hydraulic lifters can go bad, collapes or stick. And yours are definately hydraulic lifters, rollered yes, which will make them more durable, but they can go bad. The machine shop should have down a leak-down test on the lifters. That is the only way to determine if the lifters are good. I would check that you have proper oil pressure, I'm sure you do. I bought a "rebuilt head" for a Saturn DOHC engine, and the machine shop never did a leak down test on the lifters, and I had the samething happening.
Posted on Mar 17, 2010
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This car has hydraulic lifters( tappets} therefore should not adjustment, you probably have a bad or weak lifter. But, in any case you have to remove the valve covers to make the adjustment. You will see the adjustable bolt on the rocker arm. rotate the engine until the valve is all the way to the top, [no tension on the valve spring] then place a feeler Gage in between the rocker arm and the valve stem, adjust the rocker arm until the feeler Gage is snug but not tight. Do this with each valve. Check the book for the correct Gage to use but I think it is a .018.
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