Spun Bearings
#1
Spun Bearings
Hello,
I have had four stock Oldsmobile engines spin bearings. One 403, and three 307's. Everytime this happens it is the 7/8 rod journal that takes the worst damage. Was I reving the engine too much? Is this a coiencedence, or is this typical for Olds engines? None of the engines had more than 100k miles.
Also, is it possible to swap in a 350 crank into a 403, and if so what is involved to make everything work properly/
I have had four stock Oldsmobile engines spin bearings. One 403, and three 307's. Everytime this happens it is the 7/8 rod journal that takes the worst damage. Was I reving the engine too much? Is this a coiencedence, or is this typical for Olds engines? None of the engines had more than 100k miles.
Also, is it possible to swap in a 350 crank into a 403, and if so what is involved to make everything work properly/
#3
Longevity depends on maintenance and regular service as well as what has been asked from the engine. It also depends on how well or tolerances when it was first put together. An engine nearing 100 thousand miles in my book is tired. I do not believe the bearings (numbers) that you noted as spinning are a common problem with Olds engines in general.
#6
The front balancer on the 350n crank is noticibly thicker (and heavier). do i need to rebalance the whole assembly including pistons, rods, crank, balancer, flexplate? Or do I just use the 350 crank assembly and 403 rods/pistons without complete disassembly and machining. I wasn't looking to drop a grand for a crank swap.
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oldzy
Drivetrain/Differentials
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September 14th, 2010 05:40 AM