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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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