Wet sumping while running

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
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Re: Wet sumping while running

Postby Harry44 » Wed Jun 17, 2020 7:33 am

At least I'm not the only one to suffer wet sumping with the engine running. Hope you get yours fixed


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Re: Wet sumping while running

Postby SPRIDDLER » Wed Jun 17, 2020 7:46 am

56G80S wrote:Sprid

Thanks. Mine will pass through the bush. Cheeky but where is the data on wear limits?


Where relevant I use the Army Inspection Standards for my '54 model. Good move to check the wear limits as I've no idea why, (probably senility) I gave you the wrong dims for bush wear :oops: although your bush seems to be right on the acceptable limit.

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

See page 8........

Bush timing side dims (640x321).jpg
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Re: Wet sumping while running

Postby 56G80S » Wed Jun 17, 2020 4:02 pm

Thanks Sprid

It took me a while to work out but I realise that 6 thou looks like the condemn point. I was only guessing at the play. Short of a dial gauge on the end of the axle..............

I reckon the play is too great and it's stuffed one way or another but perhaps not so much that the pump plunger will be as well (hopes).

I'll pick this up again when I get the cases split.

Cheers

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Re: Wet sumping while running

Postby 56G80S » Thu Jun 18, 2020 12:02 pm

Rocker box and head off now. What a lot of carbon. It had obviously been running too rich but at least it's not oily. I probably left it rich for the running in after barrel re-sleeve and didn't weaken it later. Somewhat oddly, both pushrods were very, very slack. Maybe I did this when I was carrying out explorations at the Jampot. I really hope so.

Put some 3-in-1 oil in the top threads of the barrel nuts and maybe I won't wind the studs out like last time I took the barrel off. MIght pop some Plus gas in too. They tend to get water sitting in them.

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Re: Wet sumping while running

Postby 56G80S » Thu Jun 18, 2020 5:51 pm

Me again

Well, the nuts came off nicely. Unfortunately, the barrel is naughty word, naughty word. the inlet side of the piston is also naughty word. The former is cored sufficiently that I can feel it through the "rubber" gloves. I wonder it T&L can remove the liner and do it again? The piston has at least one piece of brass and probably more tightly ensconced in the line with the inlet valve.

Ironically I had made a nice job of reaming the small end and fitting the piston.

Lost heart at this point and will proceed to removal of the engine tomorrow or over the week-end.

So the target now is Easter next year.

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Re: Wet sumping while running

Postby Harry44 » Sun Jun 21, 2020 6:52 pm

Heart breaking I feel for you mate

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Re: Wet sumping while running

Postby 56G80S » Tue Dec 29, 2020 9:47 pm

Engine now out of frame as well as the AMC gearbox.

I'll speak with Alpha Bearings w/c 04 January about getting work done as they did the bottom end last time, back in the 1970's.I'm confident that the barrel / piston is too badly damaged to be managed by a rebore and new piston. T&L relined the barrel only a couple of years ago and there were a couple of hiccups. I'm tempted to save carriage and send all to Alpha.

I now find that the drive side axle splines are worn and when the weather picks up I'll post a photo or two for an opinion on what's what. Setting aside the pandemic, when all's back together (but with the Burman box back in as there's some work to do on the AMC) I anticipate covering plenty of miles. I don't want to change things for the sake of it but wold feel a fool to have the pin and timing side done and then find the drive side lets me down. On the other hand, new parts may not be of the same quality as the old parts.

Looking forward to a better 2021 for us all.

Johnny B

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