Tuesday, 22 November 2016

Exhaust Clamp

As I may have mentioned, when I ran the W/NG (for the second time in my care) a couple of weeks ago the exhaust detached itself at the cylinder head, due to the poor fit and inadequate clamp.You can see in this picture that the pipe is not quite aligned with the cylinder head stub - I am probably going to have to cut and shut the pipe to get it to fit. The rear stand also hits the silencer, so it may be that removing and refitting the exhaust will help but we have to start somewhere, and having the right bits is always a good place to start.


This is not the correct clamp, though it looks like some of the original brass parts are there. Here's the clamp illustrated in the 1940 parts book:


We can make one of these. First we will make a card template.

Clamped to a piece of 14 SWG cold rolled sheet ready for marking out


Cut & filed to shape


The clamp formed and ready for bending. The long centre section is now curved across it's width and the ends have been folded up


Bending the clamp - I'm doing this hot.


Fitting it for the first time reveals it is about 3/8" too short:


In principle the design is sound. I've run the bike with the clamp in place and the exhaust pipe joint doesn't leak.


We'll just have to make a longer one.

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