Oil from primary to gearbox

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Jed

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Another Norton Puzzle

The last 3 checks of the gearbox (MK 3) I found it was overfull (about 50-100ml)
So oil is migrating from the primary side to the gearbox making it a blue in colour the result of red from the primary mixing with the green
There is plenty of information about gearbox oil getting into the primary but I have not seen anything about the opposite
One possible fix is greasing the rod but I'm concerned this may make the clutch slip so would you use rubber grease or put on O ring in there somewhere?
Any ideas greatly appreciated

Jed
 
Hi Jed
How much oil have you got in your primary after you have checked your gearbox?
 
I just checked it and it seems to be just below the overflow level so I did not need to add

I just looked up the info on the seal thanks for that looks like it what I need

Thanks for the replies
Jed
 
There is good reason you or anyone else I've heard of hasn't mentioned oil flowing form primary because it essentially impossible and reason for DynoDave's seal and axle grease [+ other cleaver solutions] applied to the clutch rod to keep gear box lube out of the primary or the ground. One would have to seriously over fill primary case to point it'd be leaking out felt seal and flood clutch plates up over main shaft with oil > to make a mess on the floor before starting to ride off to pump 1' lube into AMC box. Chain case should only have oil enough to just wet the bottom of triplex chain/links when its tension is set properly loose cold. Side stand use only allows oil to flow out of AMC box so more mystery to what is really going on.
 
hI sTEVE, I HAVE PROBLEMS WITHMY 850 IF I LEAVE IT FOR A LOMG TIME THEN THE OILD FROM THE ENGINE MIGRATES INTO THE PRIMARY AND IHAVE TO DRSAIN IT OUT. Got a ball valve in the line now so that gets turned off if I don ride the bike twice a week. your primary must be pressurizing, so your felt seal on the sliding seal behind the clutch must be bloody good. Mine just pisses out there if I forget to drain it.
The primary has to breath, so fix that problem. don't know what's causing your problem, but you have to fix it. Don't want residue from you r clutch in your g/box.
regards, dereck
 
Engine oil filling primary to then spill into AMC box means fix engine leak nothing to do with primary or gear box. Hm Funny business if anti wet sump valve must be kept closed to keep cold engine oil out when parked but not when running. If ya want to know what happens from engine oil leak into 1', just let one of the 3 front inner case mount bolts come out > Ugh, gearbox over fill color change will not be your first symptom by a LONG SHOT.
 
Primary is not filling up
It was leaking due to a blown crossover shaft seal but I pulled it to pieces and replaced that + alternator grommet
No leaks from the primary now. While I had that problem I only filled the primary to the overflow bung. It was on a big trip so the oil escaping from the primary made the hell of a mess before getting home (at least the chain was well lubed)
The thing that gets me about the extra oil in the gearbox is the centrifugal motion in the primary throws oil away from the centre so how it would get down the clutch rod does not make sense but there is nowhere else it can come from and its definitely not water
As Hobot says if the primary were swimming in oil that may explain it but its not, I've greased the rod up (none left on the clutch side) and will keep an eye on it
If the main seal is gone then the engine oil should be dropping
That looked OK when I pulled it to bits a week ago and the level in the primary seems to have stabilised but will keep possible causes in mind and monitor all oil levels

Cheers

Jed
 
Jed said:
how it would get down the clutch rod does not make sense but there is nowhere else it can come from
Click to expand...

Potentially, I think oil could also get through between the main shaft and the sleeve gear (bushes), however I would still have thought there was more chance of the gearbox oil leaking to the primary, not the other way around.....but?
 
Bushses were all new a on the rebuild so should still have a bit of mileage left in them (especially since it does not get thrashed)
I have just changed the box oil and greased up the clutch rod (hoping for a seal as a seal kit install looks a little involved) and will keep an eye on it to see how that went
The oil level in the primary side has never been over the inspection bung at the bottom of the primary so if the box level keeps increasing more intensive investigation is on the cards. Bit of a bugger when the bike is running sooo good

Cheers

Jed
 
Jed said:
I only filled the primary to the overflow bung. Jed
Click to expand...

Please tellus what you mean by the overflow bung on the primary and how much oil it took to reach it.
 
Oil from primary to gearbox


Is this what you mean by problems Steve?
 
Ugh, I reflexly forget about there being a fippled shift lever version near the end.
 
I know primary pressurising has already been mentioned, but, just to back it up my Combat developed a fairly gross leak from the primary, and most of it came from the felt 'seal'.
Replacing the drive side crank seal with a fully rubberised one fixed it - the steel rimmed seals would appear to be a breach of the trades description act!
 
L.A.B. said:
Jed said:
Red oil is the colour of the SAE 30 same as the engine oil
Click to expand...

SAE30 seems a bit thin for your climate?
Click to expand...

This oil is what the Norton guys use and swear by around here. Moves quick and gets where it's needed faster
Oil changes are a bit more frequent but that's about the only drawback (apart from any leaks dripping a bit quicker)

What blend do you think would be more appropriate for a warmer climate?
So long as it were a mineral base I guess there would be no risk giving it a burl especially in the primary maybe the thin oil is the problem there

Cheers

Jed
 
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