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Leaking primary drain bolt

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Old Apr 25, 2024 | 06:45 AM
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Default Leaking primary drain bolt
is gonna be the death of me.

I have changed my primary fluid on this bike 4 times before, never an issue. this time, for some reason, the drain bolt will not seal. I have replaced the O ring multiple times, used Hylomar, regular thread sealer, and even teflon tape, and it still leaks.I swear it must be coming from someplace else, but I don't see any wet spots anywhere else.

Has anyone ever used an automotive drain bolt with a crush washer on this hole? I am running out of ideas...
 
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Old Apr 25, 2024 | 06:52 AM
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Are you sure it is not coming down from seal above it?
 
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Old Apr 25, 2024 | 07:06 AM
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Originally Posted by Rounders
Are you sure it is not coming down from seal above it?
you mean from the derby cover gasket? it doesn't seem to be, but I have a couple spares, will change that today to be sure
 
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Old Apr 25, 2024 | 07:08 AM
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No from the seal on the shaft going into to your primary that has a seal, that can drip down to that area. I reuse the derby oring for decades.
 
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Old Apr 25, 2024 | 07:50 AM
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Originally Posted by Rounders
Are you sure it is not coming down from seal above it?
Or perhaps a small crack in the thread area of the drain plug.
 
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Old Apr 25, 2024 | 01:08 PM
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Originally Posted by Rounders
No from the seal on the shaft going into to your primary that has a seal, that can drip down to that area. I reuse the derby oring for decades.
That's exactly what mine does. Runs down the back and drips from the drain plug.
 
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Old Apr 25, 2024 | 02:25 PM
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I had that on a Deuce that I had. Really looked like it was coming from the drain plug, but it was the shaft seal.
 
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Old Apr 26, 2024 | 06:48 AM
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thanks everyone. I think the folks talking about weeping out of the shaft seal were right. I was trying a new primary fluid that was much thinner than my normal primary oil. I think it was just too thin and weeping past the seal. Anyways, I changed back to my normal primary fluid, went for a ride, and dry as a bone. Weird I know, but thats what it seems to have been
 
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Old Apr 26, 2024 | 10:14 AM
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I spent a fortune chasing that same leak. Shaft seal. Looked like it was drain plug. Never could resolve it. I wish now that I had just lived with it.
 
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