The T shaped mark looks to me that the rings were all aligned at one point or another and it blew all the combustion past. Maybe that's when I saw that poot of blue smoke on the highway?
Knockin' On Heaven's Door, what to do for a rod knock?
- Thread starter MrSony
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That looks more like aluminum oxide than carbon. Does the front of the piston look like it rubbed the wall?
I don't know. I tore it down to the short block yesterday but had to pack up early. I'll have more time tonight and tomorrow to tear further into it.
are you sure those marks were not there before you put the engine together? The honing marks go through the black marks and are still clean
They were not there. The engine was spotless inside and out before I put it together. I made sure of that.
PontiacGP can correct me if I'm wrong, but you cannot see the amount bend in a rod that he is describing. It needs to be checked by a machine shop. I still don't understand the detonation/pinging issue, but I agree with others that you had an oil stavation issue.
The debris in the pan identifies that you need to get the block cleaned and a new set of cam bushings. The rods with the bad bearings need to be resized and you might as well get the mains align bored.I think the oil pressure gauge at the rear of the block would be a great idea.
The debris in the pan identifies that you need to get the block cleaned and a new set of cam bushings. The rods with the bad bearings need to be resized and you might as well get the mains align bored.I think the oil pressure gauge at the rear of the block would be a great idea.
I finally had enough time to tear my motor down all the way to the block in the daylight. Here is what I found. After tearing the block down the entire way, this is finally what I think happened. The front cam bearing went, as you can see. The chunks and shrapnel from that got sent through the motor, and resulted in metal being ground into the bearings, and potentially blocking the oil passages starving the already trashed bearings of oil. Also, what the HELL happened to my fuel pump eccentric?!? How could that pump have done that?
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it doesn't take large pieces of metal to ruin the bearings. I always use a magnetic drain plug in my oil pan. At least you found the cause which is a good thing. But I would still get the #8 rod checked out at a machine shop. And read that article in the link I posted. Looking at the main bearings you might want to the use the Clevite P series for the mains
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Yeah, I read the article. I assume when resizing rods they check the straightness. But I'll tell em anyway.
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