Thread: Valve Lifters

You need to remove the inlet manifold, valley gasket, rocker covers, rockers and push rods. You will also need to drain the coolant system to a level below the inlet manifold, and god help you if you drop anything into the engine.
Not hard, but time comsuming and you need to be careful when re-gasketing stuff. New gaskets and sealant required for the valley. Read up on the shop manual first.

Are you sure it's lifters? It could also be the rockers, as they can have a fault (apparently) in the Thor engine, so I'd be checking that too.

thanks guys. The noise seems to be coming lower than the rockers so I can only assume it's the lifters. I will double check thou!

If your replacing the lifters, you really should change the cam as well as it will also be worn. Depending on how many Ks the truck has done the timing chain and sprockets whilst your there as over time this also will stretch. Not a hard job, just take your time.

It's only got 50k on it and just had the heads de-coked as it appears the valve stem seals were shot from day one. It was pinging when i bought it with 30k on it. I am hoping it is just simply the lifters given the amount of k's and previous issue.

yeh they have only become noisy (sounds like just one) since getting it back from the "head job". They reckon they checked the cam for wear and all was OK, it may just be bull **** they spun me but he seems a trustworthy guy.

I know this sounds stupid, but have you checked that the exhast manifolds are nipped up properly, I remember my old 3.9 made a strange tick which turned out to be the damn nuts on the manifold comming loose.

did they use the wrong grade of oil when they did the heads up.....?


i would start with something as cheap as an oil change......