Gear box oil seal

Information relating to the Matchless G11 or AJS Model 30 600cc twin
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Gear box oil seal

Postby John Grew » Tue Oct 11, 2016 6:45 pm

I have just finished the total rebuild of my 1957 Model 30 and have now done a just 60 miles and already it is on its second new kick start shaft oil seal. It has a new shaft and seal but even so it leaked from the off. I got another new seal a cut a narrow strip of 5 thou shim and put it in the grove before fitting the second new seal. This slowed the leak a bit but it did not cure it and still weeps all over the floor.
Does any one do a decent seal to stop this or do you all just live with the mess?
John Grew

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Re: Gear box oil seal

Postby Duncan » Tue Oct 11, 2016 7:16 pm

John, are you using:

040005X KICKSTARTER SHAFT SEAL AMC X RING VERSION

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Re: Gear box oil seal

Postby clive » Tue Oct 11, 2016 11:08 pm

Put less oil in?
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Re: Gear box oil seal

Postby Expat » Wed Oct 12, 2016 1:32 am

Duncan wrote:John, are you using:

040005X KICKSTARTER SHAFT SEAL AMC X RING VERSION



This option worked on my G3.

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Re: Gear box oil seal

Postby 56G80S » Wed Oct 12, 2016 4:14 pm

X ring also worked well for me.

Daft thought but if it's not the shaft / seal interface then is there any casing damage where the seal meets the casing?

It's a a while since I looked at this area.

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Re: Gear box oil seal

Postby 1608 » Wed Oct 12, 2016 6:53 pm

Simply, replacing with the original type 'O' ring is a waste of time. The educated among us now use a lipped seal and they don't leak.

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Re: Gear box oil seal

Postby John Grew » Wed Oct 12, 2016 10:34 pm

Thank you all for the replies and I do like the one re: the lip seal as that is what I am looking for. Firstly where can I get one and secondly does the casing , which is not damaged, need to be machined out?
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Re: Gear box oil seal

Postby 1608 » Wed Oct 12, 2016 10:49 pm

I believe the o/s dia is 1" and there is no need to mess with the casing. I always get my seals from my local bearing supplier, but the club spares probably have them too.

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Re: Gear box oil seal

Postby John Grew » Thu Oct 13, 2016 8:46 am

Good morning 1608. I will give it a go but from memory the standard seal is flexible and has to be to get it in to its grove . The access is not an open hole. That it how I got the strip of shim. However, I will have a go as I do not want the mess and I don't want to run it with less oil and in my book it is broke so I will fix it. Thanks to one and all for you input and I will let you know how I get on.
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Re: Gear box oil seal

Postby petert120r » Thu Oct 13, 2016 9:24 am

If you buy the quadratic kickstart and gear spindle seals from either the Club or AMC Classic Spares they are quite easy to fit in the grooves. Make sure you replace the gear change spindle one as the original ones leak there as well.

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