[BIB1132]

I have a lower end oil leak having trouble fixing on my 1978 15hp Evinrude.
I have replaced the back to back shaft seals and the oring on the Gearcase assembly. I still have oil coming out of the prop. I have even used a blue gasket seal along the oring for a tight seal as it seemed loose. There is still water getting into the oil (milky) and around the Gearcase Oring you can see heavy oil residue. Is it possible there is a leak at the water pump or another seal that would cause enough internal pressure to push oil/water through the oring even with a good seal? Any help would be appreciated, getting tired of redoing the seals.

[Vic.S]

Oil Leaking from behind the prop is most likely coming from the prop shaft seals or the bearing carrier O ring Other places that could be leaking are the vertical drive shaft seals below the water pump or even the seal or bushing O ring on the shift rod.

THIS DIAGRAM shows them all

# 2 the prop shaft seals, #7 the bearing carrier O ring, #24 the drive-shaft seals, #25 and 27 are the O ring and seal on the shift rod.

A pressure test should identify the source of the leak.

Don't forget that the fill and level plug washers should not be reused as they can be a source of water ingress.

Don't confuse partly burnt oil from the fuel with gearcase oil. Oil from the fuel leaking from around the prop is normal

See the item "Oil leaking from the lower unit" on the engine FAQs board, top item in the Repair and Maintenance index above