Primary leaks

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htown16

htown16

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I have a dribbling primary on my recently rebuild 74. Use ATF so only one place the red stuff can be coming from. Looks like it is coming from the bottom seam between the inner and outer cover. I'll take it apart and clean and check for flat. I carefully shimmed the inner cover when I built the primary.
I installed the rubber band seal with no sealer. Is it a good idea to use a sealer and if so what.
 
Do not over tighten your outer primary case or it will leak, is it a new sealing rubber or old one.

Ashley
 
Here is more discussion re: seals in the primary:

https://www.accessnorton.com/NortonCommando/inner-chaincase-sealing-discs.23670/#post-348915

I have no leaks in an Atlas primary ...... If that can be done, the Cdo is a piece of cake.

Check also, the gasket between the inner primary cover and the drive side crankcase. If you can find 1/32" thick synthetic cork or reinforced silicone gasket material, make your own gasket from those materials. BTW, those materials make an excellent sealing washer between the discs.

Slick
 
i haven't run across a confirmed fix for commando primary cover (rubber band seal mentioned op) O ring leak other than the above link,

even if there is, another issue mentioned by others for going belt drive is clutch slippage issues (dunno the details) with the chain/oil drive setup
 
Last edited:
texasSlick said:
BTW, those materials make an excellent sealing washer between the discs.
Click to expand...

Slick - sorry to be a bit thick - what discs are you referring to?
If it's the ones at the primary shaft I wasn't aware they could be removed and gasket material added.
Cheers
Rob
 
My '74 primary is OIL TIGHT. Shimmed correctly on the center stud, black (VERY oil resistant) RTV applied around the stud, stator wire grommet, trans seal sheet metal housing, and, in the groove before the giant o-ring. Also, on top of the o-ring. Nipped up, RTV wiped tidy.
I WAY OVERFILL the case with ATF (bottom chain run completely submersed).
No drips. At all.
 
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