So far I took appart 4 3B, 2 pre1985 , 2 post 1985.
The pre 85 have two hole on top of the conRod to cool piston (idle) and lubricate the wall instead of one on the post85… which leave a little less oil for the wrist pin.
Might be a coincidence but. the wrist pin were really worn out on the older. Even at 400k km the 1986 were not too bad.
All of them were NA
I would be more concern about preventive maintenance on older 3B, specially on a turboed one.
A crankshaft running low on oil pressure make hot spot on bearings, kind of melt the antifriction material and eventually seize, won’t turn after. The crank shown signs of increased temperature, turn blue, mini fracture.
The pre 85 have two hole on top of the conRod to cool piston (idle) and lubricate the wall instead of one on the post85… which leave a little less oil for the wrist pin.
Might be a coincidence but. the wrist pin were really worn out on the older. Even at 400k km the 1986 were not too bad.
All of them were NA
I would be more concern about preventive maintenance on older 3B, specially on a turboed one.
A crankshaft running low on oil pressure make hot spot on bearings, kind of melt the antifriction material and eventually seize, won’t turn after. The crank shown signs of increased temperature, turn blue, mini fracture.