Mk3 backfire device

Hi there, I am in the process of completing the rebuild on a Mk3 that came to me in pieces and I do not know the history of, as I am completing the assembly of the primary a friend suggested that I check the torque on the backfire gear, from what I understand to do this I would have to buy/ build a socket adaptor that would enable the torque wrench to be mounted on the splined shaft and the cost appears to be considerable, is it common for the backfire gear not to be at the correct torque setting?

possm said:

from what I understand to do this I would have to buy/ build a socket adaptor that would enable the torque wrench to be mounted on the splined shaft and the cost appears to be considerable,

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I used short lengths of welding rod inserted between the splines and a suitably sized socket.

possm said:

is it common for the backfire gear not to be at the correct torque setting?

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It's worth checking if you are able to, in my opinion.

Hi,

Look at this Old Brits article:
"Another way to adjust this device which I have not tried, but a couple of customers have tried successfully, is to slowly back off the nut and hit the starter until the device slips and will not turn over the engine. Then tighten the nut until it will just turn over the engine. Again I think you will need to mark the nut in case it backs off when the device slips."

When I replaced my sprag, bearings, washer, chain, clutch hub etc., I left the backfire overload device well alone. It didn't look like it had been mangled by wrenches / spanners, so I trusted it.

L.A.B. said:

I used short lengths of welding rod inserted between the splines and a suitably sized socket.



It's worth checking if you are able to, in my opinion.

Old Britts, Overload backfire device assembly and adjustment

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Sorry, duplicated your reply. You're quick off the draw!