Will replacing the bearings at this stage be pointless?
My oil pressure is low and I've got between 2-300K miles so I want to go ahead and replace the mains and rods. I was just going to order the bearings in standard sizes. I'm hoping to get by for a while longer without rebuilding. I know my plan isn't perfect, but I figure it's added insurance.
My oil pressure is low and I've got between 2-300K miles so I want to go ahead and replace the mains and rods. I was just going to order the bearings in standard sizes. I'm hoping to get by for a while longer without rebuilding. I know my plan isn't perfect, but I figure it's added insurance.
Does this sound feasable?
There is no way to tell until you get into it. Just a forewarning though, the cam bearings are also a place where oil pressure is lost. You may end up putting money into new rods and mains, and oil pump since you are there, and still have no better oil pressure. With the mileage you are stating I feel that is probably beyond a set of bearings.
Once you get that far into the engine, you are bound to find other things that "should" be replaced, then it will be hard to turn a blind eye. It sounds like you are trying to save for a rebuild or looking for as little down time as possible. If either is the case, why not buy a core, and slowly start rebuilding it on your schedule instead of doing it on the truck's schedule. You can save replacing the bearings and build up the other engine at your pace, while you baby the engine you have in the truck.
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Once you get that far into the engine, you are bound to find other things that "should" be replaced, then it will be hard to turn a blind eye. It sounds like you are trying to save for a rebuild or looking for as little down time as possible. If either is the case, why not buy a core, and slowly start rebuilding it on your schedule instead of doing it on the truck's schedule. You can save replacing the bearings and build up the other engine at your pace, while you baby the engine you have in the truck.
Thats a good idea and excatly what I done on my Jeep Cherokee. I picked up a 4.0L that was past it's prime, for free, and slowly rebuilt it over a couple of months. Swapped it out in less than a day and was gone again.
If the engine has that many miles on it, and still runs ok to do what you want, then I would leave it alone. How much oil pressure does it have? It doesn't have to have much pressure to run ok. If you have 5-10lbs of pressure at idle, and more than that going down the road, it should be ok. If it gets really low, the lifters will start ticking.
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