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Originally Posted by Arrowshooter
Thunderbolt, Were you able to pinpoint the offending cylinder? Can you remove the pan without jacking up the engine? I am leaning towards the wrist pin theory as my oil pres. reads the same now as when I purchased the truck. My idea would be to replace noisy piston/wristpin but retain the rings. I would however breakout the plastiguage and check all the bearings.
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I haven't tried pin pointing the cylinder yet, But I do know it is on the passenger side. I don't know if it would be worth tearing the engine apart to replace one wrist pin, But if you can definately pin point it it may work. You have to either jack up the engine or pull the front diff to get the pan off. I pulled the diff because it is easy to do. You will not be able to do a wrist pin without removing the engine and dissassembling it. The head has to be removed in order to remove the piston and if you replace the piston you should hone the cylinder and use new rings. By the time you do all that you are spending almost as much as a reman. engine. In fact I don't know if you can even by individual pistons.The trans and engine has to be seperated to remove the crank and even if you were able to do that removing and installing the crank from underneath would be nearly impossible. With all the work it would take I don't think I would do it. I wouldn't tear a 100,000 mile engine apart for a wrist pin or piston slap if it were mine. I would keep driving it. If it is a bearing you could replace the crank, bearings and oil pump, But you still have to remove the engine. I would drive it and save for a long block if it was mine. I now have the money set aside when mine does go (although it has been over 50k since it started). Brand new from the dealer I can get a complete long block for $2,500 and it has a 3 yr 50k warranty.