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A bearing knock is a deeper sound compared to a lifter tap or rocker arm tapping. Noises on a running engine are hard to diagnose at times. A cracked flywheel can sound like an engine about to self destruct. Sometimes you can pinpoint a rod knock by pulling a spark plug wire off each cylinder, one at a time, while running, then rev the engine some. If the bearing isnt too bad when there is no firing going on in the cylinder the noise will go away.
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