Thread: Lower unit
View Single Post
Old 09-04-2018, 11:31 AM
tkwalker's Avatar
tkwalker tkwalker is offline
Owner and Administrator
Join Date: Apr 2005
Location: Lebanon, Tennessee
Posts: 2,891
Smile Lower unit seals ... <'TK><

The lower unit can be removed by yourself. Sometimes it helps if there are two people to help go back with it .. You will need to align the water tube, engage the drive shaft into the crank while turning the flywheel until the splines match.

As far as the seal leak 90% of the time it is the shift linkage "O" ring seal. I haven't replaced a 3 cyl. 70 hp OMC in a while and off the top of my head can't remember the the logistics of removal and replacement ...(Is it an electric shift?) It would also help if you pressurized the lower unit with about 7 PSI of air and check all of your seals via Soapy water ...

While you are there you might as well change the Water Imp. Now if you want to make this a winter project and it seems this is not a fast leak, Just keep an eye on it .. It takes 3 to 5 days for the water and oil to separate. The first thing out will be the water out of the bottom fill hole or it may be milky. you do not need to dump all of the oil ...Just add until it clears up coming out of the upper vent... Quicksilver High Performance HyPo 80/90/ will mix with water and continue lubricating ... Hope this helps <'TK><
Reply With Quote