dry primary leaking
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Stage IV
Joined: Nov 2010
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dry primary leaking
i own a 79 fxs superglide that was converted to both primary and secondary belt drive, problem is its leakin oil on back side at rear of primary cover, the primary drain plug is left in it, and it will spot about the size of an apple after a ride if i let it sit for an hour and stand bike up straight within mins its puddled up. im told the oil line that supplies the slinging is plugged and there is a rubber plug on a line. but i actually dont know what im lookin at so im takin ppls word for it. if it is plugged off where can the oil be coming from? and how is it leaking out if the drain plug is still in? also my primary is stock and not vented, is it necessary to buy vented derby cover and inspection plate for a belt drive. any 411 greatly appreciated, thanx
Elite HDF Member
Joined: Jul 2010
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From: Lorain Ohio
I think you are experiencing what I have an that's a bad mainshaft seal. I just pulled my trans. The main shaft bushing has too much play. The shaft wobbles a little an distorts the seal. I just got the replacement bushing, next is to have the old one pressed out the shaft micro polished an the new one machined to fit. I also ordered a spacer that goes on the outside of the shaft between the trans case an sprocket with an "O" ring to help prevent future leaks.
Elite HDF Member
Joined: Jul 2010
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From: Lorain Ohio
Road Warrior
Joined: Dec 2007
Posts: 1,854
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From: Eagle River WI
About venting the primary With a belt drive primary what I do is put 1/4 in spacers between the inspection/derby cover and the outer prim to get air flow inside the primary Keeps the heat down That oil coming through the drain plug could it be coming from the back of the inner primary ? One more question do you have an idle on the primary belt and if not how much up and down play does this prim belt have in the middle Just curious
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Stage IV
Joined: Nov 2010
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I think you are experiencing what I have an that's a bad mainshaft seal. I just pulled my trans. The main shaft bushing has too much play. The shaft wobbles a little an distorts the seal. I just got the replacement bushing, next is to have the old one pressed out the shaft micro polished an the new one machined to fit. I also ordered a spacer that goes on the outside of the shaft between the trans case an sprocket with an "O" ring to help prevent future leaks.
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Stage IV
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Stage IV
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thanx for the info, i havent had primary off yet but yes the oil is coming from the back off inner primary and the primary drain plug is still intact, do you know how i can distinguish 60wt oil from 80/90 wt gear oil i jus changed both at same time and have ridden it since but the fluid on floor loos too dark for the 80/90, oh yeah i did crank it and let it warm up good as to check the oil level when at operating temp so i was thinkin the oil never being all the way sucked out would leave enuf old oil to discolor the new, which would point me to the front of the primary for the leak? am i rite?, i guess i need to pull cover off and inspect closer