Primary Leak
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Stage I
Joined: Jul 2018
Posts: 1
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From: Texas
Primary Leak
05 Super Glide, Just changed Engine and Transmission oil. Everything was running fine prior to doing so. About 120 miles after the oil change I was warming up the bike and noticed the primary leaking (pretty good). With no obvious signs of leaking I decided to do a oil change on the primary. New O-ring and gasket installed with 1 quart of synthetic oil. While warming up the bike again (throttled up a little) I saw the primary leaking again and the oil looks fairly used. Have no idea what this could be from other than a over tightened O-ring on the drain pug, but why is the oil so black with out any use? Any help would be greatly appreciated.
Ultimate HDF Member
Joined: Aug 2010
Posts: 5,014
Likes: 739
From: Northern California
Best to clean the bike, check the engine oil filter is tight, check fluid levels are not more than they should be. Warm the bike on a stand and look for leaks. If you continue to see oil from the primary the question is, is the leak at the front or back of the primary? Derby cover, drain plug, etc?
Advanced
Joined: Apr 2018
Posts: 78
Likes: 5
From: Syracuse, NY
First thing you should do is figure out where the leak is coming from...is it even the primary? You said the leak started after doing engine and tranny oils. Chances are too slim for it to randomly start leaking immediately after doing other oil changes.
Outstanding HDF Member
Joined: Mar 2015
Posts: 2,840
Likes: 900
From: Philly Suburbs
07streetbob07 is right on the money... You really need to determine exactly where the leak is coming from. I just had my primary open for a clutch pack, and after my first ride I saw liquid dripping from under the center of the inner primary. I was sure one of the tower gaskets behind the inspection cover had slipped, and was allowing fluid out the back of the inner primary (in my immediate frustration it didn't even occur to me that the level of primary fluid would be way below this point when the bike wasn't running). I got everything together to pull the cover, but fortunately investigated further first... The "leak" was actually coming from my Mikuni vent line, which is routed right into the same area.
Supporter
Joined: Jan 2007
Posts: 15,787
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From: along the shore of Mishigami
If you put too much trans.oil in, rec. 20-24 ozs., there may be some venting out the vent hose. This hose will drip onto the inner case with the bike on the jiffy stand. The primary on the 05's take 26 ozs., or to the bottom of the clutch basket. Another less likely leak would be this shift shaft seal behind the inner case where the shaft goes into the transmission.
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