Problems Removing A10 Primary Chaincase Inner

[trevinoz]

Hubie,
             The clutch centre hub should be a close fit to the sliding plate with almost no gap around it.
What clutch are you running?
If a six spring, there should be scrolled oil slinger pressed onto the gearbox end of the hub.
If a four spring, the slinger is machined into the hub.
Trev.

[brackenfel]

Hi Bill,
Thanks for the advice about the breather mod.. Mine has engine / frame numbers from '61 , registered May '62 so I'm afraid it's probably a different one.
Got to get some gaskets, bolts (the long ones for the chaincase / FERC front are bent!!) & start putting it all back together..

Adrian

[Hubie]

It appears then that the oil slinger is missing.  The bike is running a RGS clutch (4 spring) with the clutch hup doubling as the bearing surface for the rollers on the clutch basket.  If I can't find something to do the job, I will make something.

Cheers]

Hubie.

[orabanda]

Contact Colin Tie (Perth WA); he makes and  / or modifies the backing plate and installs a seaql. It works much better.

9295 6875





Richard

[orabanda]

This is how I added a pipe tp the breather hole, to prevent the crankcase oil / air making a mess at the rear of the crankcase.



Mind you, the original arrangement ensures that the chain is always lubricated!
Richard

[Hubie]

Thanks a million for that mate,

Now I know exactly what I need to get done.  Those picutres are a big help.

Cheers

Hubie.

[bsa-bill]

I recall a trader (sorry can't remember who - was on Ebay) stating that the hub adaptor he was selling had the scroll the correct way unlike some others on the market.
So there are hub adaptors out there that are going to scroll oil out instead of in.

All the best - Bill

[brackenfel]

Hi Richard,
Very neat, many thanks for the pics...

Adrian

[trevinoz]

Hubie,
              The scrolled slinger should be a machined part of the hub, unlike the six spring type which has a pressed on part.

Richard,
              I like the seal but I guess the hub has to be machined off to accommodate it. Correct?
  Trev.
           

[orabanda]

Trev,
Correct!

[Brian]

This is a mod I have been thinking about for some time and its good to see how someone else has done it. I assume he has a bronze bush the other side of the seal.

My thought was to leave the clutch hub as it is except to machine the scroll off and use a larger seal to run on that surface, that would leave more room between the hub and gearbox sprocket to run the bush.

Must pull mine apart sometime and put some more thought into it.

[orabanda]

Brian,
No bronze bush; it's a seal carrier.

[Brian]

Hmmmmm, so if there is no bush what stops the seal from distorting when you adjust the primary chain. There would have to be something to pull the plate back when you adjust the chain. If the seal carrier runs on the shaft to do this then thats steel on steel, would wear a groove in the shaft.

I would love to see a picture of the other side of the plate.

[trevinoz]

Brian,
            The plate is a sliding fit because the securing bolts have a shoulder which stops the plate locking solid to the inner case.
With the original set-up the bushed section of the plate finds its own centre when the gearbox is adjusted.
I suppose a garter seal would do the same.
Trev.

[orabanda]

Trev described it well.
The plate will slide, and the seal retains its correct shape