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Old 02-08-2011, 03:37 PM   #1
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Default GM 3800 Series II Engine knock

63K Engine, very clean inside. Took off oil pan, no metal shavings, tried isolating cylinders by injectors and plug wires, and still no change in loud tapping noise. Tried the stethoscope, noise seems to be coming from the timing chain side of the motor, Valve train seems to be functioning properly, Engine runs fine, not missing or smoke. Good compression on all cylinders are about 150 psi. Pulled off serpentine belt, noise still there. Any Ideas???
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Old 02-08-2011, 09:37 PM   #2
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Well, you did say it'* coming from the timing chain cover area. I would say pull the cover. The chain tensioner may be going bad.
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Old 01-28-2013, 02:00 PM   #3
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turns out, spun the #2 rod bearing. rebuilt engine with new used crank, updated harmonic balancer, runs great!
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Old 01-28-2013, 02:38 PM   #4
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Good news...but almost 2 years later??
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Old 01-31-2013, 02:26 AM   #5
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It'* been running for about a year and a half. Just REALLY slow on the updates...
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