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javadog javadog is online now
Join Date: Apr 2005
Location: In the wind...
Posts: 29,092
First, quit starting and driving the damn thing. If you've got what you think is a rod knock, an oil analysis is useless. Pull the pan and look at the rod end. If you have excess clearance, pray that the crank journal isn't ruined. If you see that the rod end or crank journal is darker than the others, that is a sign that excess heat was involved and I'd suggest you look for an oiling problem. If you end up pulling the motor apart, check that cylinder's piston top for detonation signs.

Examining the cat will tell you if it failed from heat. That's usually from excess raw fuel in the exhaust.

The two problems may or may not be related but the cat failure was probably a result, not a cause.

I should probably mention that the oil viscosity that should be used is dependent upon the designed bearing clearances, so it's possible that one of the bearing clearances wasn't right to start out with, or maybe the wrong weight of oil was used at some point.

Last edited by javadog; 09-03-2020 at 07:01 AM..
Old 09-03-2020, 06:58 AM
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