Hey guys,
I haven't visited the forums in many years but this ones got me stumped and I'm hoping to avoid tear down before diagnosis.
My m20 has a resonant rattle from the front of the motor that you can hear just over 1500 rpms. It does not follow engine speed and can only be heard at that specific engine speed. I poked around with a screw driver and I'm confident it isn't the crank pulley or distributor. I removed the fan and all belts and the rattle is still present.
I was thinking either the oil pump or the timing belt tensioner at this point. Anybody have any tips for diagnosing this?
Might be worth noting that I blew the timing belt on start up a couple of years back and replaced the bent valves and broken rockers. I didn't notice any real piston damage so I didn't touch the bottom end.
I'm also not sure I want to even bother with this motor any more - I've got a halfway built turbo project on an engine stand waiting to be finished so maybe this will be the motivation to make that swap...
I haven't visited the forums in many years but this ones got me stumped and I'm hoping to avoid tear down before diagnosis.
My m20 has a resonant rattle from the front of the motor that you can hear just over 1500 rpms. It does not follow engine speed and can only be heard at that specific engine speed. I poked around with a screw driver and I'm confident it isn't the crank pulley or distributor. I removed the fan and all belts and the rattle is still present.
I was thinking either the oil pump or the timing belt tensioner at this point. Anybody have any tips for diagnosing this?
Might be worth noting that I blew the timing belt on start up a couple of years back and replaced the bent valves and broken rockers. I didn't notice any real piston damage so I didn't touch the bottom end.
I'm also not sure I want to even bother with this motor any more - I've got a halfway built turbo project on an engine stand waiting to be finished so maybe this will be the motivation to make that swap...
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