Dominator chaincase inner seal

Hi Nigel, As I understand it, the seal is meant to keep oil in the chaincase, not out (oil should not be leaking from the gearbox shaft). Since you will be running the crankcase dry, the seal is not really needed.

Hi Nigel,

There should be a recess between the two halfs of the sliding plates which the felt seal is pushed into. Soak the felt in oil & work it into the recess with a blunt tool such as an old screwdriver. when done, it should be a tight fit over the gearbox output shaft & will therefore keep the metal from making contact & being soaked with oil will provide the lubrication for a good while.

Hope this helps,

Tim

Previously nigel_orchard wrote:

Apologies for starting further conversation on this but I fear my latest query might be lost to view at the end of the very helpful series of Q & A's I have already had. I now urgently need advice so thatI can start rebuilding my primary drive.It concerns the inner sliding seal that goes round the gearbox output shaft behind the clutch.I have received a felt sealfrom RGMbut it is by no means clear how to fit it. The radial clearance between shaft and metal slidingseal isless than one mm and the felt seal has to keep the metal sliding seal from resting on the shaft. 1.Which side does it sit? - I presume inside the primary chaincase and 2. How does it attach - glue, small screws, rivets - as it has to hold the sliding metal seal plates from coming into contact with the gearbox output shaft? Bear in mind I have never seen one as it was missing from my bike and not on the replacement inner chaincase either.There are no holes in the sliding plate suggesting no screws or rivets have been used. I am also worried that, as I have a belt primary drive and there is no oil in the chaincase, there will be no lubrication for the seal and it will therefore just overheat or wear away quickly.Advice would be much appreciated. Nigel Orchard

Well with a belt drive your felt oil seal is redundant, as there no oil to keep in the clutch cases , But the correct way of fitting a felt oil seal is by removing the outer case first then the clutch its self then the rear half of the clutch case, then you can fit the felt oil seal in the correct way, then you need to re-fit every thing in the same way as removed , but the only reason people fit a belt drive, is there lots in these Classic bike mags about them, and very little about about the correct way of maintaining the original items , As I do, I like my chain drive clutch, and I can seal these pressed steel clutch cases so there is no oil leaks, Maintenance on a regular bases this the right way of looking after your motorcycle, And my biggest things that drive my up the wall , is seeing Norton motorcycle with Anti-wet sumping devices like Taps ETC , That do NO good at all , only cover up there real problem of a worn Oil Pump, its the same with the gear box owners fear getting stuck in and stripping the gear box , and the Norton Gear box is one of the easiest to under stand and do, go buy the DVD on the Gearbox and play it more that once so you know it backwards , even the gearbox is timed , so when you select a gear it gets the right gear at the right time, so owners Need to pay more attention to the humble gearbox as it as a hard life, Yours Anna J Dixon Technical officer for the East Yorkshire Branch

My inner cover arrived with no discs for the oil seal So I opted for a plan B. I fabricated two discs out of some thin steel, cut a shaft size hole and then rivited them togethere to give a rough sliding fit in the inner case.

I then purchased a nice chunky felt seal, the same diameter as the gearbox shaft. This was given a good smearing of HMP grease (excess wiped away) and now sits between the clutch body and the discs I made. Seems to do the job asked of it.

Hello Nigel, i was faced with the same dilemma re the inner cover'stwo sliding metal dust seals running on the main shaft. I fitted a thin sleeve over the shaft which was a firm fit through the two metal sliding covers. The length of whichcovered from the box high gear bush to just behind the clutch hub. G/box oil will keep this lubricated.

The felt seal you referr to is, I think, #A2/493 Plate T4 in my parts book.

The parts book calls this a "front chaincase inner portion to gearbox felt seal ", and , with a bit of imagination, shows this fitted over main shaft between the main drive sprocket and behind the inner case. This would then act to seal off dirt from getting onto the mainshaft which would work it's way into andabraid the high gear bush and also work it's way into the primary drivecover.

When I dismantled my primary drive and g/box, this felt washer was missing, and the dirt that had then worked its way into the high gear bush had virtually destroyed it. Though, there was no evidence of wear where the sliding shields had made contact with the main shaft.

Paul