Any ideas of what could cause a marble sounding noise at 3k? My valvetrain doesn't make a sound anywhere else in the RPM range. The teeth are still perfectly square, all my bolts are tight, and there's no plastic remnants in the pan. Maybe the tensioner?
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Marble noise at 3k?
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Originally posted by tinkerputzer View PostCould be knock. Sound like bb's rattling around in a glass jar? Is it 3k at full load in a higher gear?
Originally posted by bmwman91 View PostThe little idler sprocket for the timing chain could be on its way out, or maybe the top bolt of the driver's side chain guide rail is stripped.
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The M42 seems to not run smooth at kinda exactly 3000 RPM.
Just to mention.
With my M42 and many miles on the engine, I could easily hear that 3000RPM just wasnt healthy for it, while 2900 and 3100 are fine again.
Even on a complete rebuild M42 now, since I knew, I can still here the difference at exactly 3000RPM.
If you drive on the highway for a longer distance, I would also avoid 3000RPM, and rather go a bit faster or a bit slower.
But I dont know if its just my engine and others are fine...?
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