76 Evinrude, 135 changing seals behind the prop

[Pacifictimes]

leaking milky oil by the prop. Figured it was the lower seal. Looking at my manual I don't see any specific directions to changing these out. I s there any concerns or special procedures I need to go about to replace these?

 

[Bosunsmate]

Re: 76 Evinrude, 135 changing seals behind the prop

Not really just watch out for the power in those split rings they can do human damage in an instant

 

[racerone]

Re: 76 Evinrude, 135 changing seals behind the prop

The 2 big circlips do not need to be removed in order to pull out the bearing housing.--------Leakage you describe can be quite normal for that motor when idling on a hose.-----Is any water getting into the gear oil ??

 

[Pacifictimes]

Re: 76 Evinrude, 135 changing seals behind the prop

In reply to "Is any water getting into the gear oil", I would have to say Yes, I believe that is what's turning my oil milky colored. But No I have not directly seen water per sey.

 

[racerone]

Re: 76 Evinrude, 135 changing seals behind the prop

Gearcases are pressure tested to check integrity of the seals.-----------Seals do wear out when shafts spin at 5000 RPM and 2500 RPM

 

[Bosunsmate]

Re: 76 Evinrude, 135 changing seals behind the prop

I normally just do all the seals, its often cheaper than paying for a pressure test

 

[boobie]

Re: 76 Evinrude, 135 changing seals behind the prop

Have the gear case pressure and vacuumed checked to see exactly where it is leaking. It may not be the prop shaft seals.

 

[boobie]

Re: 76 Evinrude, 135 changing seals behind the prop

Bosun, how do you know the seal job is done correctly after seal replacement if you don't pressure test it again ?? After a seal job I always test them again.

 

[Bosunsmate]

Re: 76 Evinrude, 135 changing seals behind the prop

Bosun, how do you know the seal job is done correctly after seal replacement if you don't pressure test it again ?? After a seal job I always test them again.

I take the boat out and then inspect the oil again afterwards. Luckily thats always fixed it for me. Id like a pressure tester system but considering i only look after my friends and their friends outboards i have a few other things up the purchase list to get first.

 

[emdsapmgr]

Re: 76 Evinrude, 135 changing seals behind the prop

Boobie is correct, a dealer will test lower units for water intrusion, by doing both a pressure and vacuum test. A lower unit seal kit will come with these parts: a shift rod seal, a shift rod housing seal, a pair of propshaft seals, an upper driveshaft seal, orings for the 4 bearing housing bolts and a large oring for the bearing housing. Any of these can cause water intrusion into the gearcase-including the nylon seals on the two drain/vent plugs. Best to get the whole gearcase seal kit and do them all.