The Marston Sunbeam Club & Register Forum

General Category => Technical Discussion Forum => Topic started by: Steve_M90 on July 07, 2017, 06:11:19 PM

Title: Clutch corks
Post by: Steve_M90 on July 07, 2017, 06:11:19 PM
Is there a specification for how thick the cork should be in the sprocket and the clutch plates? I've had mine replaced but I'm having trouble reassembling the clutch and getting the final steel plate to engage with the centre piece.

Steve
Title: Re: Clutch corks
Post by: VicYouel on July 07, 2017, 07:57:20 PM
The 1932 parts list available from the club web site specifies  the two thicknesses. I have found they are usually a little too thick and need some work of mix in some used ones.
Vic
Title: Re: Clutch corks
Post by: Steve_M90 on July 07, 2017, 09:05:17 PM
Vic,

Thanks for making me look at the parts list more closely. Being a young lad and metric, I had assumed the dimensions referred to the plate thickness and not the cork. The dimensions imply 9mm and 5.5mm. I have had to sand the two inner plates down to ~5mm and I'm still little concerned by the slim engagement of the final steel plate with the centre piece.

Steve
Title: Re: Clutch corks
Post by: VicYouel on July 08, 2017, 07:50:46 AM
Yep it is pretty dodgy in my opinion so I use  some worn or the slimmer version.
Cheers
Vic
Title: Re: Clutch corks
Post by: phutton on July 10, 2017, 02:27:18 PM
I had exactly the same problem with my 1935 clutch. I took Vic's advice and used three of the thinner corked plates. I am told, but haven't tried it, that if you use modern ferodo-type friction material, you can take out one corked and plain plate. Anyone want to have a go?

P.