Reduction Gear oil seal replacement Yanmar 3gm30F

upsidedown · 23-07-2008, 12:34

My Yanmar 3GM30F reduction gear is leaking a little oil where the shaft exits the casing. This oil is thrown out by the flange. I have new seals but I am curious if I have to totally remove the transmission and reduction gear or can I simply remove the flange and replace the seal that way? I would appreciate knowing which way to go before I get into the small, tight quarters with my bad back.

never monday · 23-07-2008, 17:38

Quote:

Originally Posted by upsidedown

My Yanmar 3GM30F reduction gear is leaking a little oil where the shaft exits the casing. This oil is thrown out by the flange. I have new seals but I am curious if I have to totally remove the transmission and reduction gear or can I simply remove the flange and replace the seal that way? I would appreciate knowing which way to go before I get into the small, tight quarters with my bad back.

if you have enough room behind the trans to swing the required wrenches and sockets. It can be done in the boat. You'll need to be able to push your shaft back a good 6" or so. With a bad back, I'd recommend pulling the trans.

Chief Engineer · 23-07-2008, 19:08

I got advice from the previous poster.....not a problem if you have the room

BTW IS there a Bight, ME?

never monday · 23-07-2008, 19:20

Quote:

Originally Posted by Chief Engineer

BTW IS there a Bight, ME?

yes, kind of, in virtual altered reality way.

Chief Engineer · 23-07-2008, 22:04

I am heading up to Maine in a coupla weeks....wanted to get a decal like that...to go with my KW and MRE and HON (Baltimore)

Quote:

Originally Posted by never monday

yes, kind of, in virtual altered reality way.

23-07-2008, 12:34	#1
upsidedown Registered User Join Date: Jul 2008 Posts: 14	Reduction Gear oil seal replacement Yanmar 3gm30F My Yanmar 3GM30F reduction gear is leaking a little oil where the shaft exits the casing. This oil is thrown out by the flange. I have new seals but I am curious if I have to totally remove the transmission and reduction gear or can I simply remove the flange and replace the seal that way? I would appreciate knowing which way to go before I get into the small, tight quarters with my bad back.

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23-07-2008, 19:08	#3
Chief Engineer Registered User Join Date: Aug 2006 Location: North of Baltimore Boat: Ericson 27 & 18' Herrmann Catboat Posts: 2,011	I got advice from the previous poster.....not a problem if you have the room BTW IS there a Bight, ME?