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Replacing Lower Unit Seals BF225 ?

J

jamey

Member
Happy New Year Everyone!

Year two with my 2005 BF-225's, and my gear case oil came out milky on both motors. No metal or raw water, just milky. I plan on pressure testing to see which seals leaked, but since they are cheap enough, I am thinking it wouldn't be a bad idea to change them all, including the shift shaft seal. Is this a good idea, and is this a hard job? Any tips? I am an auto mechanic, and have rebuilt plenty of automotive differentials. Honda service manual shows pulling prop shaft holder to replace the prop shaft seals, but I would like to avoid that if possible.
 
Not terribly hard to do. If you have the Honda manual follow it carefully.

Do not try to remove the prop shaft holder without removing the shift shaft first...if you do, there are detent balls (ball bearings) #28 http://www.boats.net/parts/search/H...5/BF225A5 XXA /PROPELLER SHAFT (1)/parts.html that will pop out and probably wind up in front of the forward gear. They are difficult to get out if that happens.

There is probably a way to change the seals without pulling the holder, but I think it will probably take more time and effort not doing so.

Good luck.


Mike
 
Both drain plug and vent screws had new OE o-rings installed when I serviced them in the spring. They were not loose, gaskets looked fine. I will have the props and water pumps off this weekend to see if there is anything obvious.
 
jamey said:
Both drain plug and vent screws had new OE o-rings installed when I serviced them in the spring. They were not loose, gaskets looked fine. I will have the props and water pumps off this weekend to see if there is anything obvious.
Click to expand...

Just checking the simplest first. The seal under the water pump is the probable the culprit.
 
Docksidemarineservices said:
Just checking the simplest first. The seal under the water pump is the probable the culprit.
Click to expand...

Thanks. I was thinking the same after looking at the design, I may have tampered with the seal under the water pump some how, last year when I changed the impellers. If that is the case, is it standard procedure to change all of the seals anyway, or just the one that is leaking?
 
jamey said:
Thanks. I was thinking the same after looking at the design, I may have tampered with the seal under the water pump some how, last year when I changed the impellers. If that is the case, is it standard procedure to change all of the seals anyway, or just the one that is leaking?
Click to expand...

If the input shaft seal is leaking, replace it and pressure test again. No special tools needed to replace that seal.
 
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