1958 Matchless G3

Information relating to the Matchless G3 or AJS Model 16 350cc Heavyweight
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Re: 1958 Matchless G3

Postby George Kaplan » Wed Jan 09, 2019 8:57 pm

Second question (actually its sort of two questions)

The front bracket has a hole through it. However it is roughly 3/8" at one end and roughly 1/2" at the other. Is this correct? I can't imagine why it needs to be of two different bores?

If it is correct then my question is what is the stud like that goes here to attach the engine plates?

If not the I assume it should be 3/8" all the way through?

Here are a couple of pictures.

Front Bracket 2.jpg


Front Bracket 3.jpg


John.
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Re: 1958 Matchless G3

Postby Duncan » Wed Jan 09, 2019 9:41 pm

This file should give you all you ever wanted to know about engine mounting studs and spacers for post war singles: http://archives.jampot.dk/technical/General_technical_topics/Singles_engine_mounts_studs_spacers_1946-1964.pdf

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Re: 1958 Matchless G3

Postby George Kaplan » Wed Jan 09, 2019 9:56 pm

Hi Duncan, thanks for that that is a very helpful file, I thought I had saved all of the relevant files from the archive but I must have missed that one.

It confirms what I thought, the hole should be the same all the way through for a 3/8" stud. I will undo the previous modification when I repair the other issues.

That just leave the other question regarding symmetry of the brackets around the centreline of the frame. My gut says that they probably are symmetrical but it would be nice if someone could confirm.

John

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Re: 1958 Matchless G3

Postby George Kaplan » Wed Jan 16, 2019 8:47 pm

I managed to get some correct engine plates which arrived today. I had hoped that once the plates were here then the alignment of the engine would be obvious and I was pleased to find out that it is obvious.

In the first picture the two highlighted mounting points have not been modified and confirm that the alternator models share the 3 1/2 inch width and I can now define the extent of the required repairs. Note I don't have any studs yet but plenty of bar in the correct diameters so I have cut slightly oversize lengths to use to locate everything and will turn them into studs when I repair the frame.

Image


The second picture shows what I had wondered about, if the engine mounts are symmetrical around the centre line of the frame? It isn't.

Image

When I was putting the engine plates on I have noticed that the front mount that has been sawn off hasn't been bored out as I had first thought. The engine mounts are 3/8" bore at the edge but are a bigger bore in between.

I have take a poor phone picture of one of the rear mounts of what I mean.

Image

Now I can get on with repairing the frame.

Once that is done I want to get it on its wheels and to do that I need a right hand fork leg. I have made some enquiries but haven't found one yet.

John

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