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 - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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