1955 AJS 18CS - Fire Ring dimensions

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
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Re: 1955 AJS 18CS - Fire Ring dimensions

Postby Mick D » Sun May 05, 2019 6:34 am

Hi

The damage to that head gasket is more likely to be the result of a bad head to barrel joint, lack of clamp up where the gasket has spread and leaking hot gas causing the heat damage.

Regards Mick

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Re: 1955 AJS 18CS - Fire Ring dimensions

Postby Halfwhelk » Sun May 05, 2019 8:42 am

Thanks Dick,
What is the source of this detailed information? Is it publicly available? None of the manuals/instruction booklets I have found and downloaded are anywhere close to a 'Workshop Manual'.
BTW, thanks for your YouTube videos, they are the most detailed source of instruction I've yet found.

Matt

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Re: 1955 AJS 18CS - Fire Ring dimensions

Postby Dixter » Sun May 05, 2019 10:47 am

Hello Matt, the instructions are on page 36 of FW Neil’s Manual at this link.

http://archives.jampot.dk/book/Workshop ... models.pdf

The page looks like this.

F6C17AE9-C1B3-4263-92A9-C0CC4EF3F10A.jpeg


When I find poor gas tight joints on AMC engines, with ALLOY barrels, I first flatten the head by careful use of grinding compound rubbing the head on a sheet of thick glass. Alternatively, adhesive backed sanding discs on a granite surface plate. Once the head is flat, invert head and secure to bench top, and grind barrel to head with short rotating strokes, as used on seating engine valves with grinding paste. When a nice even flat matte appearance is obvious, clean up and assemble with 40 lbs/ft torque. No gasket, no leaks!

Ciao, DC
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Last edited by Dixter on Mon May 06, 2019 6:28 am, edited 3 times in total.
Dick Casey
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Re: 1955 AJS 18CS - Fire Ring dimensions

Postby Dixter » Sun May 05, 2019 11:06 am

Matt, here is the info archives we all use for detailed information on AJS / Matchless bikes. It’s maintained by a hard working Dane named Christian Gyde.

Here is the page leading to many technical books.

http://archives.jampot.dk/book/

At this level, you can find Owners Manuals, Workshop Manuals, and Spares Lists.

Moving up one level (we all fondly recall navigating on DOS based computers) we get this link.

http://archives.jampot.dk

Now at the “parent” or Root Level, you can see the entire wealth of Christian’s collections of books. Please also note, a PayPal link. Christian pays for server time, space, and hardware and appreciates a donation. Toss the Lad a Kroner or two!

Ciao, DC
Dick Casey
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Re: 1955 AJS 18CS - Fire Ring dimensions

Postby Halfwhelk » Sun May 05, 2019 5:10 pm

Dick,
Thanks for this. It was the information I had been seeking. Thanks also for the link to the archive. All duly bookmarked and Christian appreciated.
Cheers
Matt

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Re: 1955 AJS 18CS - Fire Ring dimensions

Postby Andy51 » Mon May 06, 2019 8:17 pm

Apologies for delay, but I have just measured spigot height on cast iron 500cc barrel at 0.115 ins. Cheers, Andy

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