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The Marston Sunbeam Club & Register Forum

Sales and Wants => Parts Wanted => Topic started by: mthearle on August 07, 2023, 12:16:20 PM

Title: Model 9 Magneto Sprocket Housing
Post by: mthearle on August 07, 2023, 12:16:20 PM
Hi Everyone,

I believe my 1930 Model 9 is missing housing for the magneto sprocket. 

Would anyone have one they would be prepared to part with?

Thanks
Mick
Title: Re: Model 9 Magneto Sprocket Housing
Post by: phutton on August 10, 2023, 01:06:02 PM
No Mick, you are not missing the housing - it was only fitted as standard to the M90 and M80, not to the other models.

P.
Title: Re: Model 9 Magneto Sprocket Housing
Post by: mthearle on August 10, 2023, 09:04:47 PM
Thanks Paul,

Is there meant to be some sort of sealing arrangement there? At the moment I just have the opening through the timing chest where the sprocket goes through.

Thanks
Mick
Title: Re: Model 9 Magneto Sprocket Housing
Post by: phutton on August 11, 2023, 11:00:13 AM
No Mick, there is no seal. The aperture is quite large to allow for chain adjustment. Strangely, very little oil comes through this large hole- I suspect that the sprocket acts as an oil slinger, and any oil thrown off just slides down the inner edges of the cover.

P.
Title: Re: Model 9 Magneto Sprocket Housing
Post by: mthearle on August 14, 2023, 10:15:52 AM
Cheers Paul.  I'll go with that and see what happens.

Thanks
Mick
Title: Re: Model 9 Magneto Sprocket Housing
Post by: singleminded on August 15, 2023, 07:19:34 AM
Another thing to bear in mind about the outrigger for the magneto drive is that not all the sprockets were machined to run in the bearing.
I have two Sunbeams and neither are running an outrigger including my M90.

John Hood
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