Oil Leak on Primary Side
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Road Warrior
Joined: Apr 2009
Posts: 1,757
Likes: 4
From: Northern Illinois
Oil Leak on Primary Side
Just got home from an extended weekend trip and noticed a small amount of oil on the garage floor, after inspecting it appears it's coming from the transmission side of the inner primary. My guess is the mainshaft bearing and lip seal is leaking. Any other areas the oil may be leaking from other than the previous mentioned?
Road Warrior
Joined: Oct 2007
Posts: 1,824
Likes: 59
From: SW Burbs of Chicago
Same thing would happen to me after a long ride. Come home and next day I would find a dime size drip on the floor. I kept an eye on it and found I was losing about a qt in 2 weeks. Took it in and had all the seals on that side of the motor changed. $450.00 later no more drips and oil is right where it should be on the dip stick.
Seasoned HDF Member
Joined: Jun 2006
Posts: 28,559
Likes: 3,954
From: Vermont
Change out all the seals whilst you have it apart. If it happens to be the shifter shaft seal, try out a Cometic double lip one as it is better than the HD one, but if it's coming from the rear near the tranny, it's probably the main one like you said.
Banned
Joined: Feb 2009
Posts: 6,259
Likes: 5
From: NW NC
Cost me about $40.00 to have a MMI certified tech replace my gasket. My guess would be about $200.00 at an HD shop.
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Road Warrior
Joined: Jan 2008
Posts: 1,752
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From: Indianapolis, IN
I had a small leak after 30,000 miles on my 06. My extended warranty covered the replacement of all the seals on that side.
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Banned
Joined: Jul 2009
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You said 'tranny side of the inner primary'... I just did a baker dd6 gear set install and once completed I have a little seepage of tranny oil between the inner primary and the main drive pully. Originally I thought it was the primary cover drain plug leaking. Turns out I must have nicked the main drive pully lip seal with the main shaft end when installing the gear set. It sounds like that same seal is your culprit to me.