LU Seal Leak?

[Dave K.]

While changing out the gear oil this past weekend, the old oil had a stream of lighter colored almost tan looking oil mixed in the w/ the rest.

Is this a Seal Leak & is replacing the LU Seals a difficult job?

Thx Dave

 

[pnwboat]

Re: LU Seal Leak?

It's fairly easy to do, if you have good general mechanical experience. Also depends on which motor you have. Some are easier than others. Corrosion is also a factor as these motors have been around for a while. Some parts/bolts can be difficult to remove.

 

[Dave K.]

Re: LU Seal Leak?

Model 856X4L.

Sorry about that, I just realized I didn't include the model. Thank you & YES I'm pretty good w/ a wrench. I changed out the impeller two seasons ago so most of the bolts have been out & I used antisieze to install.

I assumed I did have a leak as I've not seen this stream the past 5 years.

Thanks again. Dave

 

[pnwboat]

Re: LU Seal Leak?

The spool #11 in the diagram below is potentially your biggest problem (zoom in for a better view). It has two large "O" rings that seal against the inside of the gear case. Sometimes the spool is hard to get out. Other than that, it's pretty straight forward.

http://www.boats.net/parts/search/Merc2/Force/85%20H.P.%20%281984%29/856X4L/GEAR%20HOUSING/parts.html#

 

[jerryjerry05]

Re: LU Seal Leak?

It also depends on how much water was in the oil.My 85's both drain plugs weeped a little water.No mater what I tried to seal them with.I always found a bit of colored oil in the lower when I changed it.
You need to get it pressure tested before you disasemble.It might be just a fill gasket leaking.J

 

[Dave K.]

Re: LU Seal Leak?

Thank You Both...!