no oil returning to the tank

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
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Re: no oil returning to the tank

Postby g80csp11 » Thu Nov 08, 2018 11:00 pm

if you are close to Russell Motors in Clapham junction , its easy by train and just next to the station
by appointment Les will do the crank and bush while you go for a cup of tea

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Re: no oil returning to the tank

Postby Mick D » Fri Nov 09, 2018 8:33 am

Hi

Sorry to sound like the harbinger of doom, but the flywheel shafts are, by design, press fits in the wheels, you say the drive side shaft is now loose which indicates damage to the shaft and or the wheel. This damage will have created a misalignment of the crankpin to the con rod and hence my concern over the state of the big end, (you will probably get away with the small end). With the drive side loose, the timing side bush well worn and the oil pump drive broken it's possible that the timing gears have been under undue pressure, check them carefully.

I don't know if oversized shafts are available but that may be an option to repair the damage on the drive side.

Regards Mick

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Re: no oil returning to the tank

Postby SPRIDDLER » Fri Nov 09, 2018 10:00 am

g80csp11 wrote:if you are close to Russell Motors in Clapham junction , its easy by train and just next to the station
by appointment Les will do the crank and bush while you go for a cup of tea


Les supplied and fitted a new big end and drive side axle for my single and replaced the con rod as on mine the big end eye was oval.
All done exactly as Peter said, whilst I went for a brew.
He uses the original factory tooling which he and his dad rescued ('and several vanloads of parts') from the Plumstead factory when it was cleared out.
I poke badgers with spoons.

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Re: no oil returning to the tank

Postby willowbedone » Fri Nov 09, 2018 2:59 pm

Thanks for all helpful advice I've discovered that the drive side flywheel is well worn and will need replacing I have contacted Ken De-groome who has all the parts to repair it .So it's off to Ken crankcases as well and will come back sorted :P :P

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Re: no oil returning to the tank

Postby clive » Fri Nov 09, 2018 4:22 pm

Does this mean I can delete your wanted ad then? Adverts Editor
clive
if it ain't broke don't fix

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Re: no oil returning to the tank

Postby clanger9 » Fri Nov 09, 2018 5:39 pm

Sounds good! Glad to hear you've found the parts you need.
Ken will do a top quality job, it'll be as good as new once you get it back. :beer:
1966 AJS Model 14 250 CSR "cafe racer"
1993 Ducati 750SS

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Re: no oil returning to the tank

Postby willowbedone » Fri Nov 09, 2018 8:40 pm

Yes all good I find it sad though that there are not many firms / people left who can carry out this type of technical work
Maybe I'm getting old

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Re: no oil returning to the tank

Postby willowbedone » Wed Nov 14, 2018 5:11 pm

All good delivered crank and cases to Mr Ken De-Groome .Ken dismantled the crank whilst I was there the only part salvageable is the con rod ! crank pin and axle nuts were not very tight resulting in wear to flywheels Ken has sorted flywheels axles And I ordered a new big whilst there. I was very impressed with Ken's knowledge and his skills
It's good to know that when I collect the crank that all will be perfect :D

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Re: no oil returning to the tank

Postby willowbedone » Mon Dec 10, 2018 6:09 pm

Tomorrow I'm of to ken de-groome to collect the assembled bottom end Wednesday looks like an enjoyable day in the garage rebuildng the bike Next thing will be cam timing and ignition timing Do I time the inlet cam using the g3 marks or not Anyone who has done this ? Is it an improvement or will it cause any troubles

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Re: no oil returning to the tank

Postby SPRIDDLER » Mon Dec 10, 2018 6:21 pm

willowbedone wrote:Do I time the inlet cam using the g3 marks or not Anyone who has done this ? Is it an improvement or will it cause any troubles


Good news, Ian. Be sure to liberally (engine) oil all parts as you assemble the barrel/head etc., especially the bearings and oil pump plunger. Anneal the copper head gasket (even/especially if it's a new one). Not wishing to teach Granny, so forth, but fit the barrel and head after installing the bottom end.
Follow the instructions in the Owners or Workshop Manuals and also have a look at this excellent article on cam settings which also refers to using the 500/350 marks, although I've never felt the need do it:


http://archives.jampot.dk/technical/Gen ... e_Dots.pdf

This article by a one-time member 'ITMA' is very worth a read before re-assembly:

http://archives.jampot.dk/technical/Spe ... hanics.pdf

And:
I would fit the crankcase oil unions whilst the engine is out. Also the oil pump plunger and its end plates and the crankcase breather which are all difficult to access later.
I poke badgers with spoons.

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