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Primary leak

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Old Apr 13th, 2008, 12:05 PM     #1
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Primary leak

Hello All,

New member with a question. My 2005 RK Classic seems to have sprung a leak at the primary. It is collecting near the drain plug, but I don't think that's where it is leaking. Where are the most common leaks developed at after 23,000 or so miles? I'm riding to Laughlin in less than two weeks and won't be able to do much about the leak until after the trip. Figured I would top off the oil before I go. It is a very slow drip.

Last edited by BKDIII; Apr 13th, 2008 at 12:28 PM.
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Old Apr 13th, 2008, 12:53 PM     #2
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Re: Primary leak

More than likely if it's not the gasket, it's the starter jack shaft seal or the trans shaft seal as a second choice . Each which would require a bit of work to change.
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Old Apr 13th, 2008, 01:04 PM     #3
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Re: Primary leak

It's not leaking man, it's Marking it's spot.
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Old Apr 13th, 2008, 01:06 PM     #4
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Re: Primary leak

Couple of quick questions:

How bad is the leak? Couple of drops over night, or a pretty good puddle everytime you stop?

Have you cleaned it well so that you can determine if the oil is coming from the left or right side of the primary?

If it is coming from the left, snug up the drain plug a quarter turn (did you use teflon tape on the drain plug when reinstalling?).

Snug up the five derby cover (clutch inspection cover) screws or better, replace the quad ring (gasket).

If the leak seems to be from the right side of the primary, is it chain case oil, or does it seem to be tranny oil or engine oil?

If you are getting a "leak" on the right side of the primary, but can not seem to find a source for the leak, do you still have that goofy u-tube shape short piece of hose on the transmission vent? I had that spraying a fine mist of transmission oil on the right side of the primary that I fussed with for weeks until I figure it out. I just got a longer hose and routed it across the top of the tranny to the rear of the starter and over by the over flow hose on the right side of the bike hanging down towards the road.

Anything more than this will probably mean taking stuff off the bike to see where the leak is. Good luck.

TQ
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Old Apr 13th, 2008, 01:39 PM     #5
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Re: Primary leak

Replace the "O" ring on the drain plug. The newer ones have a "O" ring. Older bikes had none and guys would use thread compound or Teflon tape...Good luck...Hope ya have a great trip.
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Old Apr 13th, 2008, 02:04 PM     #6
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Re: Primary leak

Quote: Originally Posted by TQuentin1 View Post
Couple of quick questions:

How bad is the leak? Couple of drops over night, or a pretty good puddle everytime you stop?

Have you cleaned it well so that you can determine if the oil is coming from the left or right side of the primary?

If it is coming from the left, snug up the drain plug a quarter turn (did you use teflon tape on the drain plug when reinstalling?).

Snug up the five derby cover (clutch inspection cover) screws or better, replace the quad ring (gasket).

If the leak seems to be from the right side of the primary, is it chain case oil, or does it seem to be tranny oil or engine oil?

If you are getting a "leak" on the right side of the primary, but can not seem to find a source for the leak, do you still have that goofy u-tube shape short piece of hose on the transmission vent? I had that spraying a fine mist of transmission oil on the right side of the primary that I fussed with for weeks until I figure it out. I just got a longer hose and routed it across the top of the tranny to the rear of the starter and over by the over flow hose on the right side of the bike hanging down towards the road.

Anything more than this will probably mean taking stuff off the bike to see where the leak is. Good luck.

TQ
It left a few drops yesterday after a long and hot run here in Orange Co. Wiped it down last night and did not see anything new today.

I did tighten the drain plug, but I noticed it doesn't bottom out, it just keeps turning, but that does not seem to be where the leak is coming from.
All other bolts were tight.
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Old Apr 13th, 2008, 02:40 PM     #7
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Re: Primary leak

Be very careful tightening the primary drain plug. The older bikes (before the new design) have a tapered allen head bolt and I you over tighten it, the end can contact the clutch basket knocking off the magnet on the end which ends up in the primary oil then.

Primary Chain Case Servicing - Harley Davidson Community
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Old Apr 13th, 2008, 07:31 PM     #8
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Re: Primary leak

I know drain plugs for the primary are cheap. $3.95 @ the HD dealer. I can't see much difference being in different parts of the country. A few cents maybe, but I would question if they say $13.95. Better safe than sorry.
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Old Apr 14th, 2008, 11:35 AM     #9
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Re: Primary leak

Quote: Originally Posted by joyflyin View Post
I know drain plugs for the primary are cheap. $3.95 @ the HD dealer. I can't see much difference being in different parts of the country. A few cents maybe, but I would question if they say $13.95. Better safe than sorry.
Replaced the plug and replaced the Syn 3 with F+. Parts guy at the stealer said Syn 3 has been known to leak where other lubricants may not. So far, no leaks after short test run. Thanks to all for input.
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