Allen Bolt Tread Worn Issue - Need Help

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
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dada
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Joined: Tue Apr 10, 2018 10:43 pm
Location: Malta

Allen Bolt Tread Worn Issue - Need Help

Post by dada »

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 ??
cbranni
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Location: ABERTAWE UK

Re: Allen Bolt Tread Worn Issue - Need Help

Post by cbranni »

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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Ozmadman
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Re: Allen Bolt Tread Worn Issue - Need Help

Post by Ozmadman »

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
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed
dada
Posts: 99
Joined: Tue Apr 10, 2018 10:43 pm
Location: Malta

Re: Allen Bolt Tread Worn Issue - Need Help

Post by dada »

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.
Paul R
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Joined: Sat Sep 09, 2017 6:04 pm
Location: west yorks UK

Re: Allen Bolt Tread Worn Issue - Need Help

Post by Paul R »

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 .
cbranni
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Joined: Sat Oct 09, 2010 9:17 pm
Location: ABERTAWE UK

Re: Allen Bolt Tread Worn Issue - Need Help

Post by cbranni »

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
only dead fish go with the flow
dada
Posts: 99
Joined: Tue Apr 10, 2018 10:43 pm
Location: Malta

Re: Allen Bolt Tread Worn Issue - Need Help

Post by dada »

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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