I recently replaced my crankshaft seal on my 95 Infiniti but it’s still leaking oil in the same area, what could be the problem?

Question

recently replaced my crankshaft seal on my 95 Infiniti but it’s still leaking oil in the same area, what could be the problem

Answer 1

Two possibilities come quickly to mind:

One: that the seal land on the crankshaft is damaged and it still leaks even with a new seal - will need maching or polishing to correct.

Two: that the casting holding the seal is porous and the oil is coming out around the seal - need to replace the casting.

Answer 2

A different possibility. Your engine had lots of miles on it. Perhaps oil wasn’t changed on a regular basis. There is excessive wear between the crankshaft and the main bearings. That wear allows for slight movement of the crankshaft, causing an oil leak.

Its also possible that the outside of the crankshaft is worn at the exact spot the seal engages with. Generally this is observable with an inspection mirror.