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Originally Posted by blown 68
the seal journal was ground down last time,(really rough serations,) and welded back up to spec. it seems that the weld didn't take well, it is all crazed, leaving cracks you can feel with your nail.
one point of interest is the fourth main. the wear on the thrust surface is odd, like it was leaning forward a bit. there was a ton of wear at the lower most portion on the thrust side, the bottom of the shell, but where it met the block, it was un touched. the block half was pretty beat, uniformly. the back side, showed little wear at all on the block portion of the bearing, but the cap was only touched at the thrust edges where it meets the block. could the cap be off in machining? maybe leaning forward a bit? i don't know.
davey
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If there is roughness on the seal area it will wipe the seal. Also the same thing with the thrust flanges on the crank, they need to be straight and smooth.
The #4 main deal concerns me. I've had to correct several screw ups by other shops that didn't either get the cap to match with the block or with thrust surfaces not being perpendicular the the crank centerline. Uneven wear is the tip off there. Easy test though. I mount the line boring bar in the BHJ main spacers and dial indicate the thrust surface.