ok, i had to rebuild my engine again, this time because a bad detonation killed my piston. so i rebuilt it to factory spec, all clearences good. 50 miles into the build and i hear a faint knocking. a few more miles and its bad. so i drop the subframe and take the pan off to find all the rod bearings shot and the main bearings slighlty scored. the journals have slight grooves in them but im not taking the crank out so it will have to do hopefully. but i would like to know why the bearings died so fast. i did sandblast the head(on the sides) and spent two hours cleaning all the sand out and what i thought was sand free. but i think some sand must have gotten in the oil and went to the bearings. i had a fram filter on there which now i know is a pos, so my question is would a good filter be able to catch any contaminations? i would thinkl the filter would have caught any sand blasting particles but i guess not. oil pressure was good btw.
