The Marston Sunbeam Club & Register Forum

General Category => Technical Discussion Forum => Topic started by: Graham9 on June 01, 2013, 08:57:59 PM

Title: Engine cush drive
Post by: Graham9 on June 01, 2013, 08:57:59 PM
Hi,

I'm having to strip the engine of my 1930 Model 9 but have got stuck getting the cush drive centre off the drive side mainshaft. The book I have mentions a special tool, but I have tried a standard 2 legged pulley extractor and heat without success. Am I missing a trick somewhere?

Any advice appreciated.

Cheers, Graham
Title: Re: Engine cush drive
Post by: phutton on June 02, 2013, 10:48:13 PM
Try this: put load on the drive centre using the two-legged puller (it need not be too much) then give end of the bolt of the puller a sharp tap with a hammer. This is usually enough to break the bond between the centre and the shaft.

Good luck!
Title: Re: Engine cush drive
Post by: Graham9 on June 03, 2013, 07:12:17 PM
Thank you for the advice, I tried that but it still wont come off. Why should it stick like that, is there a taper?

Graham
Title: Re: Engine cush drive
Post by: sunbeam8990 on June 04, 2013, 09:46:34 AM
Hi Graham I have added a picture of the cush drive assembly to the gallery. Here you can see the tool that was used to removed your stuck drive which sits on a taper shaft. It would be fairly easy to make a tool which will draw the drive off the shaft (hopefully!)
Title: Re: Engine cush drive
Post by: Graham9 on June 04, 2013, 09:34:58 PM
Thank you for the picture, it's interesting to see what the correct tool looks like.

Another tweak on the puller, a bit of heat and a whack on the puller bolt tonight and it still wont budge. It has been suggested a 3 legged puller would be better, so if it's not off by the weekend I will buy another puller or make a tool like the original. Only problem with that is not knowing what thread it is.

Regards, Graham
Title: Re: Engine cush drive
Post by: Graham9 on June 05, 2013, 07:14:22 PM
Yet another heat, tweak and bash and off it came. Thank you for your help. Now to change the big end...

Graham