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Old 02-24-2011, 03:15 PM
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Originally Posted by jeepers creepers
How long bearings will last in this conditions in your opinion?
Were the cap bolts replaced w/studs? What do the rod bearings look like? This is important because if the rod bearings look normal, the possibility of the main bore being out of spec greatly increases, IMO.

Any chance you can have the main bores measured w/a dial bore gauge- or even carefully used snap gauge and a micrometer?

Was this the engine that had the mysterious oil pressure gauge fluctuation?

If the crank oil clearances, taper, out of round and straightness all fall within specs (taper and straightness seem to look OK), and the oil pressure is adaquate, AND the saddles are OK, the engine could have a normal life expectancy. But the cause for the wear should be determined. I would concentrate on the oil clearance, the out of round of both the crank main journals and the main bore.

I'd be less concerned w/the wear caused by grit than the apparent wiping that has happened. But obviously if the bearing wear were to continue at the rate it is now- w/2 hours of non loaded run time- there's the possibility it may not last long at all.
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