Has anybody experienced their rear main bearing retainer falling apart, or is it just me? The rear main bearing retainer is normally made of nylon or plastic. I had radio interference in my truck and it took me a long time to find out that my bearings were grinding because the retainer fell apart in pieces and the bearings were off to one side. Piston and sleeve were ruined. I know it's not the heat because my truck never went over 260 deg. I suspect fuel, but who knows!