Sealing tin chaincase?

Raet · Post by **Raet** » Sat Dec 29, 2007 12:00 am

Hi
I am fitting the tin chaincases on my '51 18 S
can any one give me any details on a leather washer fitted to the back of the chaincase at the gearbox hole refered to by Ken Bryant in his 2005 post"tips for oiltight tin chaincases"
Where do you get half inch thick felt to make a seal for the dynamo hole?
when I am measuring the spacers do I allow for the buckingham seal between the tins
I have some nice new stainless studs, the one for the chaincase has a long Adjuster nut, is this used instead of a spacer, if so does it tighten up against the back chaincase tin
any help is greatly appreciated
cheers
Rae

itma · Post by **itma** » Sat Dec 29, 2007 9:28 pm

you have to make your own felt washers; dr scholls shoes inserts, bits of underfelt etc any thing you can find.
the long nut does up tight against the rear case, but check that it contacts the front half or you risk distortion, pack it with a fibre washer, or one cut from a bit of old leather, helps the seal.
dont know what a buckingham seal is.

Samuel · Post by **Samuel** » Sat Dec 29, 2007 9:54 pm

G W Buckingham, neoprene seal for pressed steel chaincases - see page 21 of current Jampot

itma · Post by **itma** » Sat Dec 29, 2007 10:17 pm

ah those.
never needed one. original works just as well.

SPRIDDLER · Post by **SPRIDDLER** » Sat Dec 29, 2007 10:38 pm

quote:
when I am measuring the spacers do I allow for the buckingham seal between the tins

I use the Buckingham seal and the instructions state:

<< Check that the cases mate well without distance piece in place. Fit distance piece. If necessary add washer(s) to allow for 1.5mm thickness of GB seal. This is to avoid distortion of outer case.
(Sprid's note: i.e. there should be a 1.5mm gap between outer and inner case halves when the outer case is in position hard against the distance piece. In other words washers of 1.5mm should be fitted to the distance piece.)

Fit GB seal onto rear half of case with join at top putting tin lip into groove in seal.

Fit outer half of case into outside groove of GB seal.

Screw on centre nut finger tight keeping cases aligned

Refit aluminium band

Tighten centre nut fully >>

You're welcome.

Raet · Post by **Raet** » Sun Dec 30, 2007 9:47 am

Hi
Thanks for all your help
I didnt want to cut up my Birkenstocks, so I searched the interweb and came up with a company in Rochdale called Anglo felt Industries, which I'll try in the new year if I cant scrounge anything up before then.I am still not sure what should be used to seal the gearbox hole, leather or felt and what size it should be
Thanks again for all your help
Cheers
Rae

SPRIDDLER · Post by **SPRIDDLER** » Sun Dec 30, 2007 10:48 am

Rae
Thick felt is used inside car body panels for sound proofing.
have a browse around a breaker's yard for a piece.
The o.d. for the felt washer is not critical and you'll be able to work it out for yourself once you offer up a piece to the pressed steel chaincase, allowing an overlap for adjustment.
I don't have any seals covering my g/box or dynamo holes and there is no significant leakage.
That said, I'm pretty tolerant of drips.

Merlin · Post by **Merlin** » Sun Dec 30, 2007 2:07 pm

Hope that includes all of us.

SPRIDDLER · Post by **SPRIDDLER** » Sun Dec 30, 2007 4:30 pm

Well, you can relax as it certainly includes you, Merlin..........

laxy · Post by **laxy** » Mon Dec 31, 2007 7:25 pm

Spriddler did you use any silicone or other sealer with the Buckingham strip or did you assemble everything dry?
Its such a pain if you have to remove old cured sealant from these rubber seals before re-using them.
Also If the rubber strip does its job dry then that saves having to wait overnight for sealant to dry before putting oil in chaincase and using bike.