I don't know what you call it but the steel pressings that hold the mainshaft felt seal behind the clutch - this one was obviously leaking as it was plastered in Red Hermatite - so I drilled out the spot welds. Inside were some what I can only describe as elastic bands. Is this assembly available?
I seem to recall but yet to find a reference to someone turning up some alloy ones and using an O ring as a seal for their Commando.
Inner Primary Chaincase/mainshaft oil seal
- Martin.S
- Posts: 443
- Joined: Sun Mar 18, 2018 12:02 pm
- Location: Bristol UK
Inner Primary Chaincase/mainshaft oil seal
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- clanger9
- Posts: 1163
- Joined: Sat Jun 20, 2015 9:38 am
- Location: Chester, UK
Re: Inner Primary Chaincase/mainshaft oil seal
Yes, it's available from club spares: "910101 FLOATING SEAL KIT"
Cheap & easy to fit!
Cheap & easy to fit!
1989 Moto Morini Dart 350
1993 Ducati 750SS
1993 Ducati 750SS
- Martin.S
- Posts: 443
- Joined: Sun Mar 18, 2018 12:02 pm
- Location: Bristol UK
Re: Inner Primary Chaincase/mainshaft oil seal
Thanks Paul, £7.54 - Excellent.
Does the felt seal included fit inside the two discs or around the mainshaft?
Does the felt seal included fit inside the two discs or around the mainshaft?
- clanger9
- Posts: 1163
- Joined: Sat Jun 20, 2015 9:38 am
- Location: Chester, UK
Re: Inner Primary Chaincase/mainshaft oil seal
It goes between the discs - you fit a disc either side with the felt circle in between & pop rivet the assembly together. Once the felt has got some oil on it, it swells to fit the mainshaft. Here's a photo of mine from a while back (ignore the oil leak...)
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1989 Moto Morini Dart 350
1993 Ducati 750SS
1993 Ducati 750SS
- Martin.S
- Posts: 443
- Joined: Sun Mar 18, 2018 12:02 pm
- Location: Bristol UK
Re: Inner Primary Chaincase/mainshaft oil seal
Ah, that's what I thought, so nothing seals the steel discs to the alloy chaincase - what I imagine the elastic band type material on mine was trying to do?
- clanger9
- Posts: 1163
- Joined: Sat Jun 20, 2015 9:38 am
- Location: Chester, UK
Re: Inner Primary Chaincase/mainshaft oil seal
That's right - there's no seal between the discs and the casing. No need, because it's just a gentle splash here (and there's a reasonable amount of "springiness" in the plates to hold them tight against the casing...)
1989 Moto Morini Dart 350
1993 Ducati 750SS
1993 Ducati 750SS
- Ozmadman
- Posts: 2651
- Joined: Wed Dec 14, 2011 1:02 am
- Location: ESSEX UK
Re: Inner Primary Chaincase/mainshaft oil seal
More to keep the dirt out than the oil in I think!
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed
1960 Model 8
1974 Yamaha RD250B US Model 6 speed