1954 18S preservation project (with lots of pictures)

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
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Re: My new restoration project (with lots of pictures)

Postby SPRIDDLER » Sun Sep 23, 2018 6:32 pm

Looks like good fun. Spanner candy! I always enjoy putting a nice clean engine back together.
A propos of nothing more than idle curiosity when enlarging the photo of the head it appears that the pushrod seals (dished washer, rubber collar & flat washer) are still in place. You will of course be replacing the rubber collars?
The pattern rubber collars soon become as hard and brittle as Bakelite with heat which leads to oil leaks. I and many others have used a suitable number of Nitrile 'O' rings instead which don't harden and work very well.

Photo of suggested 'O' rings and the original rubber collars.....

Pushrod 'O' rings seal (640x480).jpg


O rings BS 210 jpeg.jpg



In this photo the (greased) 'O' rings are in place but the essential dished washer isn't shown but will be fitted.

100_1411 (640x480).jpg
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Re: My new restoration project (with lots of pictures)

Postby cfaber » Sun Sep 23, 2018 7:00 pm

Yeah, I have the seals ready and may try the oring trick, in fact you can see them (upper right corner of the work bench photo)

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Re: My new restoration project (with lots of pictures)

Postby cfaber » Mon Mar 11, 2019 5:15 am

Over the last few weeks I've finally found some time to work on the bike. I've got the engine back together
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I also started taking the bike back apart so as to do a thorough cleaning as well as polish the paint back up as much as I can.

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So part of that is to clean up the exhaust system. It's got 60 year old bentonite clay mixed with oil baked on it in layers and I suspect there were a lot of oil burn before this engine went quiet in the 1960's.

Here's what It use to look like:

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and after some cleaning

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I still need to deal with some rust but for the most part it's a lot better than what I had. I'm also going to have to deal with the band clamp. It's partially broken on one side, presumably from whatever dented and scratched up the system to begin with.

So next I'll see if I can just tack the broken clamp together, otherwise I'll have to try and find one that matches this one, with the two straps on a single bolt. I checked fleabay but so far all I found was the solid strap design from India.

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Re: My new restoration project (with lots of pictures)

Postby Group Leader » Mon Mar 11, 2019 9:55 pm

SPRIDDLER wrote:Looks like good fun. Spanner candy! I always enjoy putting a nice clean engine back together.
You will of course be replacing the rubber collars?
The pattern rubber collars soon become as hard and brittle as Bakelite with heat which leads to oil leaks. I and many others have used a suitable number of Nitrile 'O' rings instead which don't harden and work very well.

Photo of suggested 'O' rings and the original rubber collars.....

Ah, nice photograph of the installation, thanks Spriddler.

I have the O rings, I just need to build up sufficient courage at some point to whip the head off! But the engine runs, and I have so much fun on my only bike.

Maybe I need another to allow for workshop visits? :D

Very nice project cfaber, looks great!

Alan
1953 AJS 16MS and a 1/3 scale Sopwith Triplane but that's another story ..... :lol:

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Re: My new restoration project (with lots of pictures)

Postby cfaber » Sun Mar 24, 2019 4:59 am

It's finally warmed up and I'm finally feeling a little better so the the bike got a degrease and bath

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Looks a lot better, next I decided to see how well this NuFinish stuff works, this is what I'm working with over most of the bike

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and here's what I came out with after a few seconds of polishing

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Looks 1000% better and retains the original paint nicely. With this success I rolled the bike back into the garage and stripped it down. After another cleaning to get the remaining oil and clay muck off the frame this is what I ended up with

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So the frame is done and I'll move on to the rest of the bigger parts now

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:beer:

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Re: My new restoration project (with lots of pictures)

Postby SPRIDDLER » Sun Mar 24, 2019 12:56 pm

That has come up really well. You may be aware of this but I've read that the main reason for AMC acquiring the Sunbeam Motorcycle Company was to have access to their excellent stove enamelling expertise and process.
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Re: My new restoration project (with lots of pictures)

Postby cfaber » Sun Mar 24, 2019 4:14 pm

SPRIDDLER wrote:That has come up really well. You may be aware of this but I've read that the main reason for AMC acquiring the Sunbeam Motorcycle Company was to have access to their excellent stove enamelling expertise and process.


Yeah I was really pleasantly surprised how well this came out. My goal isn't to restore but to preserve and this foes a long way to not having to repaint. Can't wait to get to the remaining parts now that the frame has come out looking so great

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Re: My new restoration project (with lots of pictures)

Postby cfaber » Mon Mar 25, 2019 4:21 am

Had a few minutes tonight to get a few more parts washed, and got the front fender on
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I think it came out pretty good, considering what I started with :D

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Re: My new restoration project (with lots of pictures)

Postby cfaber » Tue Mar 26, 2019 4:29 am

More work tonight. Got the back end put back together and polished up
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Re: My new G80 restoration project (with lots of pictures)

Postby cfaber » Sun Mar 31, 2019 2:10 am

Lots of progress today. Got just about everything on the bike to discover I'm still missing some bolts and a few spacers :headbang:

Some I knew about others were a surprise. Also, putting this machine back together was a major PITA. It must have cost AMC a fortune in labor to service and build these bikes with the way they're designed. Like a reverse Japanese puzzle box

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Missing these screws here, I thought I ordered them but apparently not.
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Missing spacers
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Missing the threaded rod, washers and spacer here, Also, it appears that the previous owner may have added a link to the dynamo drive chain, or possibly was using a different sprocket (I have 3 different ones that came with this bike) so I need to investigate further.

Does anyone off hand know what the stock sprocket was for these bikes?

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Missing the bolt washer and nut for this
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And the bolt washer and nut for the top engine mount, right now I've just got an SAE bolt in there until I get the right one.
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Also, does anyone know how the spark wire was routed?

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