Can't keep the oil in

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
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Can't keep the oil in

Postby chris kelly » Sun Aug 31, 2008 11:34 pm


Graham,

No, i don't think so This is called the 'Illustrated Instruction Book AJS, Model 14, Model 14 CSR Sports, Model 14 CS Scrambler, and the 350 Model 8 plus Late type versions including the 1965 supplement.''..it came from Bruce Main - Smith ... code Theseus / 756.

To my mind, it's like basic information you would get when you bought a bike new.Maybe your bike has lost its feed ! It's a needle pointed screw located in the cylinder head and secured by a locknut. In this publication , Illustration 3 shows the needle adjusting screw 'withdrawn ' from its position between the 'fins' maybe yours has not been refitted. Obviously, you shoud detect a small hole, high up between the fins if that is the case.

I do think , perhaps during the last year or so, some one on this site said their cylinder head was not drilled out for one !

Chris.
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Can't keep the oil in

Postby Locust » Mon Sep 01, 2008 8:22 am

Chris
My head is not drilled out for the screw and locknut nor has it the other drillings inside the head for the lubrication of the guides, the only feed to the guides is via a groove down the guide to a hole in the side of the guide, this is the one I said was about 3/32" dia. which is allowing too much oil to the exhaust valve if you follow me.

Itma
I have restored about five bikes now (not all AMC) and even got into the last 10 of the Classic Bike of the year competition with my 1958 Triumph Thunderbird plus I have built a 7 style Kit Car so I think I know about restoring engines by now.

So is the head I have a standard head or a bum stear,.??????

Locust

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Can't keep the oil in

Postby itma » Mon Sep 01, 2008 10:38 am

sorry Locust I was assuming someone else had built the engine.
I am now lost as I have never seen this method of oiling the guides as you describe.
Maybe you would be better turning the guide round.

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Can't keep the oil in

Postby Locust » Mon Sep 01, 2008 1:41 pm

Itma I'll class that as a partial apology thank you.

As I understand it the head I have is a later one, I can't think it is a factory reject with no oil ways, I am hoping that there is an AMC boffin out there who can tell me if this is so.???????

The idea of turning the guide round has accurred to me but it will still need some lub.

So I am going to look at a head (with screw adjustment) and compare.

Hasn't anyone got the same head as me, am I that different. (no Comment I hear you say)

Locust

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Can't keep the oil in

Postby Tolly » Mon Sep 01, 2008 8:01 pm

I can re-call in the back of my mind reading something about a blanked off oilway, unfortunately I cannot remember what the outcome was. I have never seen one without the adjusting screw, I know if mine is not adjusted correctly it will burn oil worse than a 2 stroke. I have to have mine screwed in so far that it virtually stops the oil going to the rockers, it is that sensitive. If your head has no restriction I can only guess there is way too much oil getting up the top end.
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Can't keep the oil in

Postby Locust » Tue Sep 02, 2008 9:04 am

Tolly
I too recall seeing something regarding the blocked off screw position, but can't think where.

By the way that screw only restricts oil to the guides the rockers are fed straight though the barrel to the rocker cover, and then the oil drops down to the top of the head were it is metred via the screw to the in let guide, the exhaust guide is fed via a little depresion with a small hole in the bottom. that is the way the screw type head works but mine is not like that. I might copy that head and drill mine out.

Locust

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Can't keep the oil in

Postby wilko » Tue Sep 02, 2008 10:39 am

I can't think of any other singles or twins that had individual feed to their guides, thus they probably realised in later years that it simply wasn't needed, ie the oil feed to the barrells on earlier singles etc they soon dropped when they didn't use wirewound pistons, maybe they simply gave the last models a fraction more stem- guide clearance and did away with it all. Drugless

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Can't keep the oil in

Postby Locust » Tue Sep 02, 2008 5:04 pm

Right
I have to admit defeat, I have not got the machinery to drill out all the holes necessary to do this job, so have aquired another head (from a good kind member) so will get that vaporblasted. if the b****y thing smokes after that (has anyone got a gun) but if it doesn't I was going to buy everyone a drink, but I don't think that is practical.

I will of course let everyone know either way.

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Can't keep the oil in

Postby paul knapp » Wed Sep 03, 2008 3:24 am

Can't quite work out, that if this oil hole has to be drilled now to supposedly stop the over oiling problem to the top end, why was it not done in 1966 when the new owner took delivery of it and it was found to be excessively smoking and chewing through the oil? After all, it now has done enough miles, without this drilling, to wear out and require overhauling. Why 42 years later?
Or am I missing something?

Paul
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Can't keep the oil in

Postby chris kelly » Wed Sep 03, 2008 10:09 am


Graham,

Out of interest, what is your engine number ,please?

On this site, under ' Articles ' go to 'Technical Tips ' then to 'Lightweight Engines' by John Allen 1994.

He states, 'Later heads do not have this screw '

But my 1966 engine had it. The latest Supplementary List Spares List for 1962 , which I have, but have never seen a later one, for the Lightweights ,lists it.

Was there a phantom 'blocker offer ' in the factory. Was it ITMA, when he was there? The mystery deepens.All we want now is 'The Dick Barton, Special Agent ' music, for those who are old enough to have listened to that radio series for children !

Best wishes, Chris. ( )
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