Does anyone know which model this cover is likely to be from?
It is stamped inside with 19256, Birmal, and 53. The 3 holes are for a tacho drive I assume.
Late 50's or early 60's 88/99 with home made RC drive from a manual magneto.
Thanks Robert. Can you explain more? Not sure what an RC drive is. Andy
Revolution counter. Usually the drive is from the camshaft .I modified the same cover back in the 1960's ( too skint to buy anything) but drove the RC from an extended cam sprocket nut.
Although it looks like someone has tried to drill for a Rev counter fitting, it is in the wrong place and at the rear rather than the front of the Timing case!
The holes should be at the opposite end to the Pressure release mechanism!
Thanks guys. I had an Atlas with the tacho drive in the correct place. Anyway, it’s going to be made into a clock for the garage!
The attachments are courtesy of Bruce Tinworth and his contribution to the Dominator Service Notes. They give slightly more definitive model dates. Around 1962 the central badge disappeared leaving a large flat surface that was easier to polish on standard models. The SS model cover got a round hump over the camshaft end where the rev-counter drive was bolted. At that time there were a few people like Paul Dunstall offering their own versions of the cover. Usually as part of an exchange deal. These tended to have alternate style rev-counter mountings.
Would it not be better to make a cutaway dummy timing cover to support the intermediate gear spindle whilst the camshaft nut is slackened? As per the Norton Maintenance manual.
Mikael I was just thinking that!
Or having it welded up by an alloy specialist and used again!
I quite like the idea of using it as intended, A RC drive. It would be a good talking point ,never seen one like it . Would need a longer than usual cable. And some tolerance to allow for the mag chain adjustment.
I haven't seen too many covers like the one in the attachment. Double Trouble!!!
Add the two readings together and divide by two !, Thats accurate.