Evo main sproket seal
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Joined: Jun 2025
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Evo main sproket seal
I recen̈lly purchased a used evo upgraded to a 27 andrews. i have changed the seal twice both times seal spring faceing in i have a bdl belt drive im Thinking the crank is cuasing the seal to fail any and all answers will help figure this leaking seal out.oʻ⁸
Tourer
Joined: Jan 2011
Posts: 462
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From: Pineville, LA
Are you sure you are installing it correctly? In the manual for a 1998 softail on page 3-66 it says to install the sprocket shaft seal with the spring facing out (away from the flywheels). That's how I installed mine. Click on this link ( 1997-1998 Softail Service Manual ) and look on page 3-66 at number 4.
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Joined: Sep 2022
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From: Florida
Are you sure you are installing it correctly? In the manual for a 1998 softail on page 3-66 it says to install the sprocket shaft seal with the spring facing out (away from the flywheels). That's how I installed mine. Click on this link ( 1997-1998 Softail Service Manual ) and look on page 3-66 at number 4.
I use a smear of Rtv on the metal outside of the seal and a touch of white assembly lube on the inner rubber.
Last edited by Rains2much; Yesterday at 12:48 PM.
Thread Starter
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Joined: Jun 2025
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Seal
Are you sure you are installing it correctly? In the manual for a 1998 softail on page 3-66 it says to install the sprocket shaft seal with the spring facing out (away from the flywheels). That's how I installed mine. Click on this link ( 1997-1998 Softail Service Manual ) and look on page 3-66 at number 4.
Road Captain
Joined: Sep 2014
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From: Utopia
Seasoned HDF Member
Joined: Mar 2010
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From: Honah Lee
You need to add a signature line for your year and model with those letters Harley tags it with.
Is it leaking so bad, it's overfilling the primary?
I replaced one damaged whe alternator spline broke.
Be sure your installing seal in correct direction. My sleeve ran the seal toward one end.
it did have a groove in it. I just flipped the sleeve.
Be sure faces that the sleeve go against are not damaged.
Make sure engine vent system is correct.
Is it leaking so bad, it's overfilling the primary?
I replaced one damaged whe alternator spline broke.
Be sure your installing seal in correct direction. My sleeve ran the seal toward one end.
it did have a groove in it. I just flipped the sleeve.
Be sure faces that the sleeve go against are not damaged.
Make sure engine vent system is correct.
Last edited by Jackie Paper; Today at 03:30 AM.
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Seasoned HDF Member
Joined: Mar 2010
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From: Poolville
It would help to know year, model and mileage.. Including all engine modifications.....
I would start with a leak down test on the rings and check to make sure the breathers are working..
I would start with a leak down test on the rings and check to make sure the breathers are working..
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HDF Community Team
Joined: Mar 2005
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From: The 1980's
FYI I combined the "main oil seal" thread with this one. They appear to be about the same seal. Easier than having people toggle back and forth between 2 threads on the same topic by the same poster.
Grand HDF Member
Joined: Sep 2022
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From: Florida
He mentioned Bdl.. open belt drive they often say flip it
personally I dont think it matters. Is there too much oil in your bottom? Too much pressure? Is your check ball screen upside down? Are you putting it in dry or with a lubricant? Is it going in straight? Does the main seal surface show scares or damage?
I use a smear of Rtv on the metal outside of the seal and a touch of white assembly lube on the inner rubber.
I use a smear of Rtv on the metal outside of the seal and a touch of white assembly lube on the inner rubber.