Hello mga paps!

Front crank oil seal jumps out of its seat (4x in my truck). what causes this?

1. no endplay on the crankshaft
2. no visible "canal" marks on the crankshaft

this last remedy, i put RTV silicone on the outer lip for additional grip. still under observation.

is overspeeding a big player here? medyo mabigat konti paa ko netong mga 2 beses na natanggal e. sudden WOT kasi. hehe

engine btw is 1986 model 4d56 turbo diesel fitted with a gear type oil pump