Allen Bolt Tread Worn Issue - Need Help

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
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Allen Bolt Tread Worn Issue - Need Help

Postby dada » Fri Apr 13, 2018 7:27 pm

Hi, I tried removing crank case filter which was super dirty but when tried to bolt it again the Allen bolt it has tread is a bit worn on engine side.

What taps to use on bike to make it good again ??

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Re: Allen Bolt Tread Worn Issue - Need Help

Postby cbranni » Sun Apr 15, 2018 3:17 pm

I think the thread size is 1 3/16 x 20tpi, Tracy Tools have a tap in stock, buy the CS Plug tap for £18, that is good enough.

https://www.tracytools.com/taps-and-die ... ct_id=1012

Check you have the spring and caps in the correct order.

Colin
only dead fish go with the flow

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Re: Allen Bolt Tread Worn Issue - Need Help

Postby Ozmadman » Sun Apr 15, 2018 11:54 pm

AND.... push some rag down the tunnel to ensure no swarf gets into the oil, not too far as there is an oil way drilling a little way down on the left
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Re: Allen Bolt Tread Worn Issue - Need Help

Postby dada » Mon Apr 23, 2018 8:00 pm

I have bought 1 3/16 as suggested but it is bigger than mine not good.

Any idea what is correct size and from where I get it.

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Re: Allen Bolt Tread Worn Issue - Need Help

Postby Paul R » Tue Apr 24, 2018 4:28 pm

Just measured (allen keyed oil filter) plug off mine( engine in bits ) and 1" diameter x 20 TPI .Tracy tools tap listed but cheaper ones seem to be out of stock ? If you get stuck you can make a tap if you know some one with a lathe . Turn threads on a bit of 1" silver steel and grind /file V slots and will do the job as a one off . Good luck .

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Re: Allen Bolt Tread Worn Issue - Need Help

Postby cbranni » Wed Apr 25, 2018 5:43 pm

Darren, can I please apologise for my error, I must have picked up the wrong crankcase half and measured the thread of the oil tank filler not the filter, sorry.

Colin
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Re: Allen Bolt Tread Worn Issue - Need Help

Postby dada » Fri May 04, 2018 1:17 pm

Hi,

Ok don't worry got another taps size 1" and fixed the issue.

Special Thanks to Tracy tools and all people here.

Darren

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