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#711497 - 10/14/17 7:51 am Primary chaincase, aerosol chain spray  
Joined: Apr 2015
Posts: 347
Dibnah Offline
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Dibnah  Offline
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UK
Hi all

The primary chaincase on my AMC 500 (AJS/Matchless hybrid) was oil tight for a year or so, it's now started leaking oil at higher road speeds. I am considering trying aerosol spray for final drive chains on the primary chain and engine shock absorber instead of traditional oil. I have reasonably easy access via a small inspection cover.

Self-leveling grease might be an alternative for the chain, or possibly one of the high pressure aerosol greases (sprays as a low viscosity film for penetration).

Has anyone used this approach successfully over an extended period. Perhaps a couple of years at 2k or more miles per year?

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#711765 - 10/17/17 2:09 am Re: Primary chaincase, aerosol chain spray [Re: Dibnah]  
Joined: Aug 2001
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Mark Z Online content
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Mark Z  Online Content
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Owego, NY, USA
Direct answer, no, never tried it, but the oil bath, or splash, in the primary is there for cooling as well as lubrication, both for the chain and the clutch.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
#711779 - 10/17/17 6:52 am Re: Primary chaincase, aerosol chain spray [Re: Dibnah]  
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Dana_twin Offline
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Dana_twin  Offline
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Oregon
Mark, that's interesting since race bikes tend to have dry clutches with no lubrication, but the clutch itself is usually open to the environment, thus air cooled.

Dib, I have used Dupont teflon chain saver spray which eventually 'dries' to a wax-like substance on the chain, and seems very effective, monitoring wear/chain stretch. But I would not ride more than thirty or forty miles without a new treatment of the teflon spray, which puts the kaibosh on that, I suppose.

Some folks use ATF in the chaincase which seems like a great idea, after all the transfer case on four wheel drive cars uses a type of ATF to preserve the rubber seals, which regular oil will eventually degrade. However I believe ATF may be lighter viscosity than oil, so perhaps ATF will leak more easily?

#711838 - 10/17/17 8:18 pm Re: Primary chaincase, aerosol chain spray [Re: Dibnah]  
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Andy Higham Online content
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Andy Higham  Online Content
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Bolton Lancs UK
Conversely ATF being less viscous will penetrate the chain links easier. Cure your oil leaks and have a rusty side stand ;-)


1955 BSA B31 400cc "Stargazer"
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#711890 - 10/18/17 11:54 am Re: Primary chaincase, aerosol chain spray [Re: Dibnah]  
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Dibnah Offline
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Dibnah  Offline
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UK
Thanks for the replies, the seal between both cases appears to be OK (minimal leakage when resting), the oil leakage appears to be at sustained higher revs and speed (60mph+), possibly blowing oil out of the hole in the inner chaincase for the output shaft to the gearbox. A deflector is fitted to reduce oil leakage via the hole for the output shaft, but no oil seal is fitted (Burman gearbox, tin primary chaincases).

I have been looking for another outer tin chaincase that I can modify whilst retaining the original case unmolested, but they are rare.

I can probably rig up a ventilation tube to the small inspection cover, can also possibly modify a spare domed cover for the clutch, if I can find a spare.

An alternative is oil drip to the chain, again via the small inspection cap. Or ride at slower speeds.

Similar to mine:

[Linked Image]

#711966 - 10/19/17 6:17 am Re: Primary chaincase, aerosol chain spray [Re: Dibnah]  
Joined: May 2010
Posts: 2,550
TR6Ray Online content
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TR6Ray  Online Content

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Posts: 2,550
Illinois, USA
Originally Posted by Dibnah
Hi all

The primary chaincase on my AMC 500 (AJS/Matchless hybrid) was oil tight for a year or so, it's now started leaking oil at higher road speeds. I am considering trying aerosol spray for final drive chains on the primary chain and engine shock absorber instead of traditional oil. I have reasonably easy access via a small inspection cover.

Self-leveling grease might be an alternative for the chain, or possibly one of the high pressure aerosol greases (sprays as a low viscosity film for penetration).

Has anyone used this approach successfully over an extended period. Perhaps a couple of years at 2k or more miles per year?

Dibnah, did you ever read this thread?


'64 TR6R Plus some Twins from other countries (U.S., Germany, Japan)
#711979 - 10/19/17 1:31 pm Re: Primary chaincase, aerosol chain spray [Re: Dibnah]  
Joined: Mar 2013
Posts: 293
robcurrie Offline
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robcurrie  Offline
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Irene, South Africa
I hadn't realised you were talking twin cylinder till I saw the photo. The twin engine breathes into the primary chaincase, so you should use the same oil in there as in the engine, the level should be so the chain just kisses it, otherwise if too full, there will be a lot of churning. There is a roller bearing supporting the clutch basket which needs a splash of oil now and then. Oil shouldn't leak from the sliding seal behind the clutch if the oil level is correct, it probably leaks via the primary case breather hole (near the centre mounting bolt). I underfill the primary case, but I like to brake hard occasionally which will cause oil to rush to the front of the case and wet the chain. Check that the dripping oil is not from the oil tank breather which is sometimes routed to the front drive sprocket.

Rob C

#711980 - 10/19/17 1:34 pm Re: Primary chaincase, aerosol chain spray [Re: Dibnah]  
Joined: Feb 2007
Posts: 455
edunham Offline
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edunham  Offline
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Posts: 455
Ewing. NJ
Any chance that your breather is not keeping up with crankcase pressure at higher speeds? Could it be blocked, wholly or partially, or perhaps you are getting more blow by?

Ed from NJ

#712009 - 10/19/17 6:26 pm Re: Primary chaincase, aerosol chain spray [Re: Dibnah]  
Joined: May 2014
Posts: 325
Fetch Offline
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Fetch  Offline
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Joined: May 2014
Posts: 325
New Jersey
Chased a similar primary leak situation, turned out to be the oil level in the Primary as Rob C said. I'd verify capacity (from several sources) then run the bike with the minimum volume of oil and check for leaks before I did any work on the Primary Case or Breathers.

#712058 - 10/20/17 4:19 pm Re: Primary chaincase, aerosol chain spray [Re: Dibnah]  
Joined: Apr 2015
Posts: 347
Dibnah Offline
BritBike Forum member
Dibnah  Offline
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Joined: Apr 2015
Posts: 347
UK
Thanks for the replies, what a fine resource this forum is.

@TR6Ray, thanks for the link, chain temperature does seem to be the biggest potential issue, I can monitor it easily through the small inspection cover (although I'll have to stop first!), I have a dynamo external to the chaincase, so although the drive chain to the dynamo might be affected by an overheating, the dynamo should be safe.

@ robcurrie, poor choice of internet photo on my part, my bike is a 500 single, the primary chaincase on the twin in the photo above looks similar, this is my primary chaincase:

[Linked Image]

Oil level was set to just touch the underside of the lower chain run, most of the oil blew out in about 300 miles of hard(er) use (minimal leakage in previous 1000+ miles of plodding around). I don't think that I have a sliding seal behind the clutch (Burman gearbox), did not the sliding seal arrive with the AMC gearbox?

@ edunham, I have seen the crankcase breather, I'll check that it's clear.

@ Fetch, oil level was substantially below the chain after some hard(er) use


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