Posted by Notjustair on September 28, 2014 at 19:30:29 from (174.229.64.78):
In Reply to: Re: 560 gas motor knock posted by Brad Vaughn on September 28, 2014 at 14:10:48:
Get it hot so the oil thins a little then listen to it. If it knocks when you load it up or when you throttle it up quick it is a rod bearing. At least in my experience. I had one that I didn't notice when using but after it was hot (like when you were parking it) it knocked like Thor's hammer at idle (lower oil psi) and really bad when you throttled it up, too. The crank was totally toast on that one not just the bearings. Have it pull a hill and it will knock as well. Main bears are deeper down - more of a rumble. Rod knock makes it sound like a diesel if it is all of the rod bearings worn out like mine was.
Do something about it before you have a rod make an escape attempt or the crank is too abused to reuse. If it is knocking the crank will need ground.
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