isolated tapping is usually a vibrating/harmonic issue. any crank bearing problems are noticiable throughout the rev range....95% of the time. Either a loose part somewhere or a complex bearing (ball, roller, tapered roller) which can have all sorts of failure-sounds.
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-Russell
1991 Toyota Pickup 22R-E 2.4 I4/5 speed
1990 Toyota Cressida 7M-GE 3.0 I6/5-speed manual
mechanic, carpenter, stagehand, rigger, and know-it-all smartass
"You don't get to judge me for how I fix what you break"
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