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post #7 of (permalink) Old 14th April 2007
Technical Supremo

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Shell bearings

The first symptoms of big-end or main bearings becoming worn is the sound of hard knocking low down when the engine is started from cold when the engine has not been used for a couple of days and will disappear immediately the engine gains oil pressure. Is the oil light slow to go out as this can also be a sign of wear,etc. If this is not the case I would be looking in the timing or drive belt area in case it's a failing pulley,etc. Over the years I have found an engine always seems to be at it's peak performance when it starts to get a bit of wear and tear. One other way of telling if it's bearings is to use a much heavier lube oil which will quiet things down a bit - that's a old trick used in the motor trade - although in the long-term it's not good for the engine.
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