[charlie]

The December issue of The Cultivator will be posted out by the printers today.
Please note, membership renewal form will be on the reverse of address sheet, if you have membership to end of 2021 you will not have a renewal form.

[charlie]

Brilliant, start em young.

[charlie]

I have had a look through all the Wipac information I have and cannot see a rotor arm like that anywhere. I did find a service bulletin showing a new type gear housing, see attached. All the multi-cylinder magnetos appear to have a conventional looking rotor arm.
Looking at the photos and thinking about how it works, if I understand the operation correctly. The external contact on the rotor needs to be in contact with one of the plug lead contacts on the distributor housing at the point where it will fire ie when points start to open. It should be possible to set magneto at a point where points start to open; then without moving magneto rotor shaft,attach distributor gear housing and set rotor arm to one of the plug lead terminals.
It may turnout that the witness mark lines up with the metal strip on rotor arm at this point.

Attachments:

1. 

[charlie]

so I ordered
3/8″-18 NPTF (National Pipe Taper Fuel) thread which is standard for these valves.
I assume the 18 means mm.

The 18 refers to pitch of thread, 18 threads per inch (tpi). There are so many different threads it would fill a book.

[charlie]

Neil, I have found someone that has the Bristol 10 register, they may be able to help, see https://www.silverfoxtractorspares.com/ekmps/shops/jws8408/contact-us-2-w.asp
Club member Stuart Johnson is another possible contact.

[charlie]

Interesting, that is different from what the service instructions show. I will have a look through what info I have and see if I can find that type of rotor arm. It looks as if te gears drive the rotor arm at half speed ie a 2:1 reduction, counting the number of teeth on each gear will confirm this.

[charlie]

Copy of service instructions attached. The rotor arm looks different to the one you have.

Attachments:

1. 

[charlie]

Mike, when uploading images the file size needs to be less than 5MB. There is a guide explaining how to do this in the Help and Information section of the forum.

[charlie]

The A955BZ is for the Gem but is for single cylinder engine!
The Gem series IV with the 360 twin engine had an A1483HZ magneto other Series IV Gem had an A1137BZ. I have service instructions for both.
Do you mean the magneto drive gear or where the rotor arm is fitted?
There should be a plate on the magneto saying which type it is.

[charlie]

Another good example of how our hobby involves all sorts of skills and thinking around problems.

[charlie]

Thanks Alan.
Publication date is around 15th December, subject to printers workload and speed of Postman Pat/Pidgeons delivering the magazine.
NOTE, to save paper and costs the renewal form will be printed on the reverse of the address sheet, please remember this.
Members that have joined recently and have membership to the end of 2021 will receive their membership/insurance cards in the next couple of weeks and will not have renewal form with magazine.

[charlie]

An interesting find. I suspect to find technical information about parts like engine, gearbox and transmission it will be a case of contacting the various makers of those components.

[charlie]

You need to compress the photo file, see the following for information about how to do this.

Compressing photo files using MS office picture manager

[charlie]

The CGA still exists with their offices at Codford near Warminster.

[charlie]

Certainly different, I wonder what it was like to drive?

[Author]

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