Re: 1958 FD-12 18 hp drive shaft seal(s)

Home › Forum › Ask A Member › 1958 FD-12 18 hp drive shaft seal(s) › Re: 1958 FD-12 18 hp drive shaft seal(s)

September 27, 2015 at 11:14 pm #24725
sedover
Participant

    As mentioned single seal lips down toward the gearcase. Two seals, back to back, lips down and lips up. The old gearcases were never checked for vacuum just pressure after assembly.

    With the Sierra kit you have to be careful with the prop shaft seal. If it is still the case, the shielded one supplied has the lips facing out which is incorrect for the solo seal application on the propshaft as the lips need to face towards the gearcase. The correct OEM one is still available for most 18/20/25’s but I’m not sure if all bearing heads will take this seal.

    As I’m sure you are aware the the real weak link with the OMC gearcases is the shift shaft o-ring.

    Steve