How is the engine cover attached?

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
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How is the engine cover attached?

Postby schrottschlecker » Tue Jan 16, 2018 10:00 pm

Hello,

in my basketcase parts box, I found a metal that looks like the engine cover which sits on the engine plates. It has a metal half-circle-ring soldered on the inside. It might be a hand-made one, but I would like to know how the original cover is attached. Any idea or photo?

Thanks a lot,

Christian
outside.jpg

inside.jpg
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Re: How is the engine cover attached?

Postby cbranni » Tue Jan 16, 2018 10:45 pm

Hi Christian

See the slot in the engine plate in your first photo directly above the left side of the slot there is detent in the plate, the original covers have deeper sides than yours and have a location tit either side which locates in the detent.

"tit" is an engineering term for a raised locating dimple or protrusion.

I can't find a photo at the moment.

Colin

PS In your third photo you can clearly see the detent, a blind hole
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Re: How is the engine cover attached?

Postby Duncan » Tue Jan 16, 2018 11:44 pm

Hi Christian

This is a picture of a replica one from the spares scheme http://www.amoc-parts.com/store/comersus_viewItem.asp?idProduct=21481

If originalty does not matter you should still be able to use yours, it looks like a stud through the engine plates would engage with the washer providing it is firmley affixed, it may require a grommet to make up the difference in hole size and stop it rattling.

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Re: How is the engine cover attached?

Postby schrottschlecker » Wed Jan 17, 2018 11:35 am

Thanks for your answers.
First, I will try to get a good attachment of the part that I have. It is nicely smooth and fits well over the plates.

Christian

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Re: How is the engine cover attached?

Postby Mick D » Wed Jan 17, 2018 11:41 am

Hi

I'd be tempted to use some sort of elastic band through the washer and attached below at some convenient point, it's more easily accessible than a bolt through the engine plates and would keep the cover under tension.

Regards Mick

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Re: How is the engine cover attached?

Postby schrottschlecker » Wed Jan 17, 2018 1:48 pm

Yes, that could work or even a metal spring.

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Re: How is the engine cover attached?

Postby leswaller » Wed Jan 17, 2018 2:57 pm

A small dab of silicone sealer on the side tabs will stop the cover going walkabouts and is invisible, but it is still easy to get the cover off.
Les
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Re: How is the engine cover attached?

Postby George Kaplan » Wed Jan 17, 2018 7:09 pm

cbranni wrote:
"tit" is an engineering term for a raised locating dimple or protrusion.


Hmm. I have always thought of it as more of a slang engineering term than an official one.

You could try googling the term but I fear that the results wont help with your bike rebuild. :shock: :D

John

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Re: How is the engine cover attached?

Postby cbranni » Wed Jan 17, 2018 8:25 pm

Hi John,

Lots of slang terms in tool making :D :D :D

Colin
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Re: How is the engine cover attached?

Postby Expat » Thu Jan 18, 2018 2:48 pm

As the actress said to the bishop ;)

:rofl: :rofl:
Keep shiny side up.

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