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Lately my so call bullet proof 2000 ox66 150hp make strange noise . Seem like almost a rattling noise . It only make this noise when I run the motor 4000rpm or greater. I search the net all night but couldn't find anything regarding to it. I ran it with out the cover can't really tell where it coming from. Once I put the cover back on I can hear it. Seem like the noise coming from top around the flywheel. I did all the basic check . Compression check out good. I'm at lost with noise. I did talk to a mechanic . He think it upper bearing. He want to pull the head and look inside. To me motor not knocking or any kind of internal noise from the powerhead.
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why would he wish to pull a head if you suspect a bearing?
I would pull the O2 sensor and inspect the draw tube.
but if I did suspect an upper main bearing I would use my dial indicator the check it. -
Rodbolt , I pull the O2 sensor and the dog bone and housing. They look clean. What noise would a upper bearing make if it going bad. I don't hear any knocking or clicking sound .
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maybe he was referring to power head not the cylinder heads
a stethoscope may help locate where the noise is coming fromComment
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WTF is a dog bone?Comment
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Sorry rodbolt17 I meant the draw tube . Thank for all your help . I didn't want to full around with this 15 years old motor . So I just going to repower with a 4 stroke. These 150 hp 4 stroke cost almost $15000 with rigging .Comment
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I personally think bullet proof motors are only good if people are shooting at you, (or likely to) being bullet proof matters little if a bearing goes hey?Originally posted by Offshore_life View PostComment
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