Dropped the oil pan tonight. Found this.
so the bearing spun, squishing it out the sides of the rod. There was a complete ring of bearing still surounding the crank journal. A bit of a pain to get the rod end cap un-jammed from the crank.....
Pulled the other 3 cylinders and the bearings looked in decent shape, so only cylinder #4 was affected.
The good bearings that i pulled out were marked STD and "clevite 77" so now i know which bearings were in there. I plastigauged all the good leftover bearings and they all came to around .0018" clearance which is about right. I then put a good bearing back into the rod that had the spun bearing and plastigauged that with a good bearing in there. came out to around the same (.0019"ish)
surprizingly there is very little scoring to the crankshaft journal, nothing which i can really feel with my fingers. I havnt polished the journal yet, but that will be the next stage, (polish affected journal with crocus cloth, clean off transfered bearing material to big and small end of rod, and recheck bearing clearances with new bearings (i think ill try either Altrom, Beck arnley or sealed power bearings instead of clevite 77 that the last engine rebuilder used with no success)
Ill also make sure to grab my micrometer/bore gauge and make sure the crank, and rod big end are true and round.
Other then that its throw it back together and hopefully the car can get some km's on here again.
Why the bearing failed like this???, i do not know. the clearances seem close (from initial testing).... but maybe something was either assembled wrong, or missaligned... or the journal is out of round or tapered or something.
Ill keep this post updated and let u know how it goes.
