Having problems with your GMC Sierra 1500 ?

I have a 1998 GMC SLT half ton pickup with a 350. When I start the truck, the lifters are rapping. The rapping stops after approximately 5 minutes. This only happens when the truck has been sitting and the oil has time to settle in the oil pan.

Posted / edited by AnonymousUser on : 24-01-2022

Answers :

If it has a bunch of miles on witch I'm guessing it probably does you can try to adjust your rocker arms. This seems to more of an art then I science for me, I always have to have someone help me. See *** the cam, push rods, & lifters ware the rocker arms loosen up some. It was explained to me that you just want them tight enough you can still see them rattling around has to be done with engine running and valve covers off. Make sure you have at least a couple quarts of oil laying around.

here is a video on how to do hydraulic lifters http://www.youtube.com/watch?v=HSR36fmBR6M

here is a video on roller rockers http://www.youtube.com/watch?v=ktvIQgGhz18

More instruction can be found online or maybe you have a friend that is experienced in adjusting them.
Have you changed oil and oil filter? If you have a lot of miles on the oil, try changing....also, when you change add a bottle of Marvel Mystery Oil (be sure to "short fill" the oil by an amount equal to the Marvel Mystery Oil) so as to not overfill the crankcase.
Repair Help & Product Troubleshooting for GMC Sierra 1500

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