The old school thinking was: If it was not knocking before the new bearings, it certainly will not knock after new bearings. or This engine made it xxxhours/miles without knocking by replacing the bearings I should get another xxxhours/miles. Both have a grain of truth but every engine is different so results will vary. As already mentioned, when you pull a cap, either main or rod, inspect both surfaces. If there are noticeable grooves on the journal and the old bearings are worn a couple layers down, get the crank turned or polished. If you remove the crank, measure for out of round journals. If nothing obvious appears wrong roll in new bearings. In all other cases new bearings are a band aid at best.
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Today's Featured Article - Talk of the Town: Winterizin Engines - To Drain or Not to Drain? - by Staff. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "Winter is fast approaching..for a gas tractor should the gas tank be drained and run the engine til the carb is dry or do the gas stabilizer products I've heard of work? (tractor will not be used til spring) any other tips for winterizing?? "
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