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Old 02-26-2015, 04:00 AM   #1
Picklez_84
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Default oil getting into belt primary

hey crew, I'm still working my around this panhead... so the oilfeed to the primary has been screwed right down to shut but still seem to have oil getting into the primary?? as far as i am aware that screw all the way in should top that... any info would be great!!! it has a belt drive inside the tins
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Old 02-26-2015, 04:50 AM   #2
govmule84
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Default Re: oil getting into belt primary

Mainshaft seal leaking, maybe?
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Old 02-26-2015, 05:28 AM   #3
little d
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Default Re: oil getting into belt primary

Picklez,
I'd bet Liam is right. Pull the outer off and wipe down the inner as best as ya can with solvent, let it dry and fire it up and then chase the leak backwards.
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Old 02-26-2015, 08:09 AM   #4
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Default Re: oil getting into belt primary

And...Don't get overly concerned...Contrary to popular opinion...oil will Not harm the Belt.
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Old 02-26-2015, 08:56 AM   #5
dan r
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Default Re: oil getting into belt primary

a panhead engine never had a real sprocket shaft seal from the factory. they used a spiral groove cut in a steel bearing spacer or bearing retainer nut, depends on the year what type.

colony, the aftermarket parts maker sells two different types of seals that will work in the 48-54 and also the 55-65 panhead engines.

the 55-65 replacement simply replaces the screw in bearing retainer nut, just screw it in and be aware that it's a left hand thread.

the 48-54 is not so easy to install on a complete engine.

this one fits 55-68 engines...




this one fits 36-54 engines...
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Old 02-26-2015, 09:09 AM   #6
Scott McKelvey
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Default Re: oil getting into belt primary

Quote:
Originally Posted by dan r View Post
a panhead engine never had a real sprocket shaft seal from the factory.
For the mainshaft, +1 on the retrofit seals Dan R mentioned.

But oil may still pass through the breather (from a variety of issues) regardless of whether the chain oil passage (i.e. the screw) is closed. Also make sure the screw for the chain oiler is correct and not buggered: it wouldn't be the first time someone stuck another screw in there.
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Old 02-26-2015, 11:31 AM   #7
Larry T
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Default Re: oil getting into belt primary

The engine vents into the primary on a stock Panhead and will always pass some oil. I modified my vent tube so that instead of venting into the primary, it vents onto the rear chain. Cut the tube off in front of the 90, braze a 3/8" tube inside the vent tube, run it where ever you want it.
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Old 02-26-2015, 01:51 PM   #8
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Sweet... Thanks heaps crew I will do that... It's a 1950 by the way
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Old 02-26-2015, 02:04 PM   #9
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Default Re: oil getting into belt primary

yeah I cut my breather tube off in front of the 90 and run a tube to the chain.
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