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M42 knocking sound help
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Does this noise start happening at ~3000RPM?
It is always a little hard to tell what exactly is going on from recordings, but this could be timing assembly related. Have you given the chain and guides a look? When was the tensioner last replaced?
A common fault on the M42 is the crank thrust bearing getting chewed up. Stock, the engine only has half of a thrust bearing shell, 180 degrees. It can wear out and leave you with a lot of crank end play. Can you check that?
I would drain the oil and see what is in it. I HIGHLY recommend getting a magnetic oil pan drain plug since it can provide some insight into wear, and prevent anything with iron in it from getting sucked into the pump.
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i've replaced the tensioner maybe at 3000km/1800miles ago.
I've also replaced the timming cover gasket and when i did the guides looked ok.Even so i noticed some random rattle coming from the chain when i rev it hard, then it goes away. But now the sound is different.
Probably is the a rod bearing or crank bearing.Will get the oil pan out tomorrow and look into it.
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Originally posted by roguetoaster View PostIt sounds more like one cylinder is not firing to me than a rod/bearing issue. I would take the plugs out and inspect them. If it turns out that one is not firing (due to no spark) it's probably a coil or coil driver failure.
Originally posted by MBGold View Posti've replaced the tensioner maybe at 3000km/1800miles ago.
I've also replaced the timming cover gasket and when i did the guides looked ok.Even so i noticed some random rattle coming from the chain when i rev it hard, then it goes away. But now the sound is different.
Probably is the a rod bearing or crank bearing.Will get the oil pan out tomorrow and look into it.
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