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Sold
by simon8201 - 09/09/26 01:46 PM
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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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Joined: Mar 2014
Posts: 1,738 Likes: 56
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Mar 2014
Posts: 1,738 Likes: 56 |
Just for the record, here is an early cap (from June 2012) with the O-ring type seal.  No problems with this design as far as I know - I wonder why they changed it?
Andy
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Joined: Sep 2014
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OP
Talk Morgan Regular
Joined: Sep 2014
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2015 Morgan 4/4 (Wolf fettled) previously 2014 M3W
MINI Cooper S and numerous BMC/BL relics.
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Joined: Mar 2014
Posts: 522 Likes: 1
Talk Morgan Regular
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Talk Morgan Regular
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Ive had both the 2012 and the new type oil tank. The new one is much easier to check the oil level as it has two planes in the tank to look at rather than a dipstick which is hard to use if the oil has been sloshing around.
Changing the rubber material is the point yes. The problem is that viton is the rubber best suited to resisting the dissolving effects of pressure heat and oil. The rubber needs to withstand over 150 deg c. Looking at data tables this rules out nitrile et al.
Viton is the correct spec but i find viton is quite brittle to work with, breaking up into tiny little chunks when you cut it. The same happens when the cap closes on the tube and cuts it.
hence why I believe the interface surface areas need to be increased.
Its actually quite a complex problem...
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Joined: Oct 2012
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Talk Morgan Expert
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Talk Morgan Expert
Joined: Oct 2012
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Its actually quite a complex problem... +1 the top surface of the filler neck doesn't have a nice broad flat surface to give a decent seal and as Charles says is inclined to cut whatever gasket material you put against it. I still think that short of welding on a better neck, GLLOQ's aluminium plug with an o-ring seal is the best arrangement.
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Joined: Aug 2013
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Talk Morgan Regular
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Talk Morgan Regular
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The 2012 as above seals just fine
Why did they change it???
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Joined: Aug 2013
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Talk Morgan Regular
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Talk Morgan Regular
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Yes ive run the engine with no oil cap on and nowt came out
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Joined: May 2012
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
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To be on the safe side I have got rid of the washer and use Loctite 55 on the threads.
Doesn't leak and is easy to remove.
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Joined: Aug 2013
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Talk Morgan Enthusiast
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Yes ive run the engine with no oil cap on and nowt came out If I dont screw mine down tight I def get oil runs all over the tank.
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Joined: Mar 2014
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Talk Morgan Regular
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Talk Morgan Regular
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Sorry brittle is probably the wrong word. Perhaps crumbly...
It just doesn't cut cleanly. And when it doesnt cut cleanly with the knife I wonder what happens in the tank. Ill investigate the other materials.
Last edited by charlestkirby; 07/07/15 08:11 AM.
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Joined: Apr 2008
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Scruffy Oik Member of the Inner Circle
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Scruffy Oik Member of the Inner Circle
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What's wrong with a traditional cork gasket?
Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE
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