Question about GMC Sierra 2500

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I have a 98 gmc 2500, w/ 454 engine.. Recently the engine was making some major noise so I took off the valve covers to find that the pushrods were very loose. I then dissected the truck taking off the manifolds and the heads to find that a few of the lifters had come apart and there was traces of water on the topside of the valve covers. I ordered a new set of lifters and put engine assembely lube on them. I then put the entire engine back together following closely the tork specs for everything. When all was said and done I turned the engine over only to find no ignition. It backfires every once in a while but will not start at all. I marked the distibuter where it was before I took it of and made sure the marks where alligned when assembely came around. I also marked every engine component where it was and what side of the engine it was on. I dont really know where to start. Please give me all the ideas you have....

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Engine Cranks But Will Not Start Basic Checks:
A. Test Fuses. Test both under hood power distribution center and the fuse panel under dash. This is done with a test light tool. The test light should illuminate on both sides of the fuse, if not the fuse has failed and needs to be replaced.

B. Testing Fuel Pressure Test for proper fuel pressure with a test gauge on the fuel rail, most throttle body injection cars (TBI) are between 13 psi and 17 psi. and most (DPI) direct port inject systems are between 40 psi and 55 psi. If no or little fuel pressure is observed and there is 12 volt power present the fuel pump, the fuel pump needs replacing.

C. Checking Timing Belt Test for compression by removing a spark plug and insert a compression gauge. Crank the engine over about 5 seconds the gauge should read between 125 psi and 165 psi, if no compression is observed remove front engine cover to inspect timing belt or chain. Crank engine to observe cam rotation, if the cam does not rotate the timing belt or chain has failed. (note: if the timing belt drives the water pump it is best to replace the water pump at this time)

D. Test for Injector Pulse Remove injector connector to insert injector test light (node) or volt meter. Observe light flash or gauge pulse while cranking. If light/voltmeter doesn't respond, an ignition distributor/crank angle sensor (CKS) or an ignition module is most likely your problem.

E. Test for Ignition Spark Remove spark plug wire, insert an extra spark plug into end of wire, rest spark plug next to a ground source then crank engine. You should observe a blue spark between the spark plug gap and ground source. If no spark is observed, an ignition coil, ignition rotor or spark plug wires might have failed. (always keep hands away from engine when cranking)


The ENGINE CROSS-SECTION below (typical 'V-8' ENGINE) shows all main ENGINE components and indicates the exact location of the most HEAT DAMAGE PRONE PARTS - THE HEAD GASKETS.
I have a 98 gmc - ce53170.jpg

Posted on Jul 18, 2008

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1 Answer

Was told my lifters are worn eng. has a ticking noise more when cold. do i need to pull the head off to replace them?


No, you pull off the valve covers and intake manifold, loosen the rocker arms, turn them off the pushrods, and lift the pushrods off the lifters. Replace the lifters one at a time so you don't mix up the pushrods. If you have to take a rocker off, remember which valve to put it back on. You may have to turn the engine a bit to lift up the lifters enough to grab. For more exact procedure, including torque values, please send your engine size.

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Turn the valve rocker arm nut counter clockwise until the valve lash is felt in the valve pushrod.
Turn the rocker arm nut clockwise until all of the valve lash is removed (zero valve lash).
Zero valve lash can be felt by moving the valve pushrod up and down between your thumb and forefinger until there is no more up and down movement of the valve pushrod.
When all the valve lash is removed, then turn the valve rocker arm nut clockwise 1 additional turn (360 degrees).


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Push Rods


No, it's fairly easy, just remove the valve cover, unbolt the rocker arms, remove pushrods. Make sure you have correct parts and compare length of new ones to old ones. Too long of a pushrod and you could have major damage. Slide pushrods into lifters, you can look down through the head and see the lifter. You can also feel when the rod is in the lifter correctly. Install rockers in reverse trying to put back in exact location. I recommend torqing these, you'll have to find the spec. You could spin the engine with coil unhooked so it won't fire before you put the valvecover back on to make sure they're all moving the same. Install valve cover, etc, your done.

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