P11 Leaky Primary

elefantrider

elefantrider

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Apr 6, 2013
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Has anyone succeeded in having a 100% leak-free primary?

What is your secret, barring belt drives and O-ring type chains?

Do you use a Gasket/No Gasket, Sealant or No sealant.

Thanks
 
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I am still chasing a nasty leaky primary. It is leaking from the inner cover to engine area.

Leaks when on the side stand, and leaks when it runs.

Are you supposed to run a gasket on both sides of the spacer plate. (primary to engine)
Do you use any additional sealant there?
 
I have never had oil leak to my P11 and N15.
I use a double gasket (fitted dry without glue) both faces to the spacer plate that goes between crankshaft case and primay inner cover.
The primary covers are closed with his gasket without glue but be sure the covers are both flat (or make them flat before).
In any case be sure that the crankshaft oil seal works well.
Pay attention that the primary inner cover could have three holes:
-one for stator wires;
-one for footppeg stud;
-one for ... nothing and you must plug with glue because the chain and clutch that turn can spray oil trough (i plugged leaving a little tube for air ventilation).
Hope this help.
Piero
 
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Yes it does help, thanks Piero. Will tear it apart and write my findings here. I normally use Auto Trans Fluid in the primary just to try to determine the source of the leak. Chris
 
elefantrider said:
Yes it does help, thanks Piero. Will tear it apart and write my findings here. I normally use Auto Trans Fluid in the primary just to try to determine the source of the leak. Chris
Click to expand...
I use the same 20W50 oil of the engine
 
I think it is leaking from the bottom of the 3 screws which go into the spacer. Or from the crankshaft to inner cover.
I don't think the oil can travel up to the nothing center hole. It is not plugged on my other bike and that one doesn't leak.
Is the front or rear center hole for the stator wire?
 
I had a leak at the primary inner cover to crankcase with a new AN gasket. Made my own gasket from 1/16 inch thick synthetic cork ..... leak stopped but the 1/16" material required me to Dremel out a small relief to fit the stator mount. This would not be a factor with the P11's stator mount, but using 1/32" cork would/should solve leak without an interference problem.

The three mounting screws must be thread sealed, as the holes are thru to the crankcase.

The sliding disc seal on the transmission shaft can be better sealed by separating the inner and outer discs, and bonding a cork washer to the inner primary cover. Then rejoin the discs using short 4-40 or 6-32 pan head screws and red loctite on the nuts, tightening enough to get a snug sliding fit.

Keeping my fingers crossed, but at the present time, my Atlas primary is 100% leak free!

Slick
 
Found the source of the leak. It was the bottom tapered screw which was not flush. These screws are also bent for some reason. Guess they take the load of the footpeg when standing. I put hylomar on the taper and the threads, and swapped position of the screws until I got a tight taper fit on the bottom one.

Unfortunately, my spare primary gasket is cracked in a few places. Is anyone making solid metal-core reusable gaskets that don't harden and crack after 6 months on the shelf?? $20 for a standard gasket on US Ebay is a bit much.

Will probably also just use Hylomar instead of a gasket.
 
elefantrider said:
Unfortunately, my spare primary gasket is cracked in a few places. Is anyone making solid metal-core reusable gaskets that don't harden and crack after 6 months on the shelf??
Click to expand...


Perhaps Jim Schmidt can be persuaded to make some from his fiberglass reinforced silicone. The stuff seals well and is reusable.

Slick
 
elefantrider said:
Found the source of the leak. It was the bottom tapered screw which was not flush. .
Click to expand...
elefantrider, I have a continual static leak from my P11 that drips off the low point on the primary case. There does not appear to be a "running" leak from any of the inner case holes.

This tapered screw is the inner case/spacer/engine screw?
 
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Pa
elefantrider said:
I could not find on Andover's website under the factory part number.
Have emailed Andover for their cross reference.

20942 Inner-Chaincase fixing screws (3) Atlas and P11

Found on RGM:

https://www.rgmnorton.co.uk/buy/inn...ixing-screw-1-4-whit-x-1-2-dominator_1001.htm
Click to expand...


Pay attention because item RGM 20942
https://andover-norton.co.uk/en/shop-details/17310
are not the screws that you need.

What you need from Andover is 02.5552.

https://andover-norton.co.uk/en/shop-details/14894

Hope this help.

Piero
 
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Ok, thanks I will order those. My bike also has what looks like 02.5552 on now but they are bent. Probably not strong enough.
 
My P11 Norton primary simply static leaks slowly, which to me means a bottom edge leak. The primary does not have much oil but it all leaks out in a couple of weeks. I have not checked or rather surface plated the outside cover, but I am thinking the leak is out the bottom screw holes.
What sealant would work , and be non hard setting or make cover removal difficult?


P11 Leaky Primary

I have had issues in the past with the Norton P11 primary gasket sealant not allowing the outer case to release.
 
Is the big lower plug on the Primary cover an oil level check plug like on Commando or a drain plug?

I always considered it was the latter.
 
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