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#713711 - 11/03/17 2:19 pm A65 split in case  
Joined: Jul 2012
Posts: 398
Dave T Offline
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Dave T  Offline
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Fergus, Ontario, Canada
I just spent a few days chasing an elusive oil leak. Fixed the wet sumping but found that the leak was coming from a small split in the case where the oil pressure switch goes. Looks like someone has put double bond or similar in there before. I am guessing the crack starting after someone over tightened the oil pressure switch.

Is there anything I can run along the ( very small) crack that would seal it? Maybe Aluminium dust and super glue? Can I get a crack like that welded with the engine in the frame? I really do not want to pull it.

All ideas welcome.

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#713712 - 11/03/17 2:33 pm Re: A65 split in case [Re: Dave T]  
Joined: Mar 2006
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htown Online content
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htown  Online Content
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Magnolia, TX
You could try JB Weld which is basically an epoxy. Try to get it as oil free as possible.


1978 Bonneville T140E
1974 Trident
1970 BSA Thunderbolt
1971 Norton Commando
1972 Norton Commando
2-1974 Norton Commandos
2004 XL 1200R Sportster

Everything will be alright in the end. If its not alright, its not the end.
#713720 - 11/03/17 3:53 pm Re: A65 split in case [Re: Dave T]  
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Lancaster, California
Try using three-bond or perhaps a gear box oil silicone. As with htown said, make sure the alloy is clean

#713721 - 11/03/17 3:54 pm Re: A65 split in case [Re: Dave T]  
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Lancaster, California
Oh ya, the crack could have come from someone using an straight thread oil pressure when it should have had a taper?

#713732 - 11/03/17 5:55 pm Re: A65 split in case [Re: Dave T]  
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htown Online content
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Magnolia, TX
Dave T, what year is your bike?


1978 Bonneville T140E
1974 Trident
1970 BSA Thunderbolt
1971 Norton Commando
1972 Norton Commando
2-1974 Norton Commandos
2004 XL 1200R Sportster

Everything will be alright in the end. If its not alright, its not the end.
#713743 - 11/03/17 8:16 pm Re: A65 split in case [Re: htown]  
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Dave T Offline
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Dave T  Offline
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Fergus, Ontario, Canada
Originally Posted by htown
Dave T, what year is your bike?


The engine is 1970 so, if uses the taper threaded switch. And that is what I have, although I think the one I took out when I rebuilt this engine was straight. probably why the crack developed in the first place. I am going to v out the crack, clean with acetone as best as possible, then apply the jb weld. I am thinking I might mount the switch first so I dont break the jb weld when I tighten up the switch.

#713750 - 11/03/17 9:34 pm Re: A65 split in case [Re: Dave T]  
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htown Online content
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Magnolia, TX
The 70 has the straight/parallel thread switch. Mine does. Probably someone put a tapered one in and over tighten it. Replace it with the correct straight/parallel thread switch. Some suppliers especially on eBay will send you a wrong tapered thread one. Use a reputable supplier.
See the reply by Stuart in this thread.
http://www.britbike.com/forums/ubbt...p;Board=1&main=48889&type=thread

Last edited by htown; 11/03/17 9:38 pm.

1978 Bonneville T140E
1974 Trident
1970 BSA Thunderbolt
1971 Norton Commando
1972 Norton Commando
2-1974 Norton Commandos
2004 XL 1200R Sportster

Everything will be alright in the end. If its not alright, its not the end.
#713758 - 11/03/17 10:08 pm Re: A65 split in case [Re: htown]  
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C.B.S Online content
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Lancaster, California
Originally Posted by htown
The 70 has the straight/parallel thread switch. Mine does. Probably someone put a tapered one in and over tighten it. Replace it with the correct straight/parallel thread switch. Some suppliers especially on eBay will send you a wrong tapered thread one. Use a reputable supplier.
See the reply by Stuart in this thread.
http://www.britbike.com/forums/ubbt...p;Board=1&main=48889&type=thread



Exactly as I said... Yep, use a supplier like my company - avoid problems

Last edited by C.B.S; 11/03/17 10:08 pm.
#713766 - 11/03/17 10:35 pm Re: A65 split in case [Re: C.B.S]  
Joined: Jul 2012
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Dave T Offline
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Dave T  Offline
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Fergus, Ontario, Canada
Originally Posted by C.B.S
Originally Posted by htown
The 70 has the straight/parallel thread switch. Mine does. Probably someone put a tapered one in and over tighten it. Replace it with the correct straight/parallel thread switch. Some suppliers especially on eBay will send you a wrong tapered thread one. Use a reputable supplier.
See the reply by Stuart in this thread.
http://www.britbike.com/forums/ubbt...p;Board=1&main=48889&type=thread



Exactly as I said... Yep, use a supplier like my company - avoid problems


OK, now I am confused. my parts book for 70 lists 19- 6508. Your site lists this as tapered

https://www.classicbritishspares.co...60-2133-tr25w-t100r-t120-a50-a65-uk-made

On that same page you quote "We also stock the Late Veglia Type Oil Pressure Switch with "Straight" Piped Thread! Search 60-3719
•Made in Taiwan
•O.E.M Part number is 60-2133, D2133 or 19-6508"

Which is correct for 70, tapered or not?

Last edited by Dave T; 11/03/17 10:38 pm.
#713767 - 11/03/17 10:47 pm Re: A65 split in case [Re: Dave T]  
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Andy Higham Offline
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Bolton Lancs UK
If the hole has a faced area around it chances are it will take a parallel thread and sealing washer, if not it will be a taper thread with thread sealant.
Taper threads can exert a massive force on the housing. Apply sealant screw in finger tight then 1/4 turn with a spanner-NO MORE


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"

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