Assembly of crank case
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Titch
- Member
- Posts: 12
- Joined: Thu Aug 13, 2020 5:53 am
- Location: Bay Of Plenty NEW ZEALAND
Assembly of crank case
Hi, I’m just about ready to reassemble my AJS 31 motor, any suggestions as to what sealer is best for sealing the crank case halves ? Cheers
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Mick D
- Posts: 2884
- Joined: Mon Mar 24, 2014 5:44 pm
- Location: Aberdeenshire
Re: Assembly of crank case
Hi
I always use Wellseal on joints - even use it on threads as a measure to stop them rattling apart if they lose torque.
Regards Mick
I always use Wellseal on joints - even use it on threads as a measure to stop them rattling apart if they lose torque.
Regards Mick
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Groily
- Member
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- Joined: Thu Jul 04, 2002 1:00 am
- Location: NORMANDIE FRANCE
Re: Assembly of crank case
[quote="Mick D" post_id=239202 time=1636041503 user_id=109332
Wellseal
[/quote]
+1 for that. Excellent product I think.
I also have made very fiddly gaskets in fine gasket paper for my twins (to avoid using that small one for the filter chamber joint). Some use a linen thread or silk or something carefully laid between the halves with the jointing compound to hold it during assembly, but never tried that. Others have machined the c/cases to take an O ring round the filter chamber - haven't tried that either, but it's got to be the best route I'd have thought.
Just the standard gasket does work fine though, it's possible to overthink a lot of this stuff. Most oil leaks in this area turn out to be the blessed dynamo joint anyway on non-alternator engines!
'Biscuit', the late-lamented Alan Jacobs (RIP but still much-quoted) had a bit to say on this topic, see past threads, and his advice was second to none.
Wellseal
[/quote]
+1 for that. Excellent product I think.
I also have made very fiddly gaskets in fine gasket paper for my twins (to avoid using that small one for the filter chamber joint). Some use a linen thread or silk or something carefully laid between the halves with the jointing compound to hold it during assembly, but never tried that. Others have machined the c/cases to take an O ring round the filter chamber - haven't tried that either, but it's got to be the best route I'd have thought.
Just the standard gasket does work fine though, it's possible to overthink a lot of this stuff. Most oil leaks in this area turn out to be the blessed dynamo joint anyway on non-alternator engines!
'Biscuit', the late-lamented Alan Jacobs (RIP but still much-quoted) had a bit to say on this topic, see past threads, and his advice was second to none.
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Duncan
- Member
- Posts: 2137
- Joined: Thu Jul 10, 2003 1:00 am
- Location: HAMPSHIRE UK
Re: Assembly of crank case
Historically I have used Wellseal and the round paper gasket, like Bill I have had great success using a full face gasket following "Biscuit's" recommendations, more recently I have been using ThreeBond and the round paper gasket
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JEAN-NOEL
- Member
- Posts: 601
- Joined: Wed Oct 12, 2005 10:45 pm
- Location: FRANCE
Re: Assembly of crank case
Hello,
I have used succesfully Loctite 5188. Not a drop of oïl ! For the filter tunnel, an O ring. I have used Wellseal on the timing chest, and it was leaking, so I have used Loctite Silver Silicon, no problem. 5188 is not suitable for frequent dismantling, such as adjusting the ignition advance on a magneto bike. For the primary chaincase, I have used Wellseal, alone, as my gasket was wrong (for a single), and it was leaking as a basket ! Now, with the suitable gasket and Silicone Silver I have traces of red oil under the primary chaincase. But I use ATF oil, and finally I don't know if the seepage comes from the chaincase itself, or from the primary shaft of the gearbox.
I have used succesfully Loctite 5188. Not a drop of oïl ! For the filter tunnel, an O ring. I have used Wellseal on the timing chest, and it was leaking, so I have used Loctite Silver Silicon, no problem. 5188 is not suitable for frequent dismantling, such as adjusting the ignition advance on a magneto bike. For the primary chaincase, I have used Wellseal, alone, as my gasket was wrong (for a single), and it was leaking as a basket ! Now, with the suitable gasket and Silicone Silver I have traces of red oil under the primary chaincase. But I use ATF oil, and finally I don't know if the seepage comes from the chaincase itself, or from the primary shaft of the gearbox.