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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: Jun 2012
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L - Learner Plates On
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OP
L - Learner Plates On
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My M3W has an oil leak from the bevel box input shaft seal. Just wondering if this is a known issue, or if anyone else has had similar ? M3W has done 600 miles from new. I'll try to upload some photos to the Morgan Photo Gallery. Any insights gratefully received !
Richard
2019 M3W
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Joined: Sep 2010
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Talk Morgan Expert
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Talk Morgan Expert
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Sorry can’t help but it shouldn’t leak !
1969 4/4
1995 plus 8
1996 Plus 4 4seater
2002 Aero S1
2013 M3W
2014 Plus 8
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Joined: Jun 2012
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Thanks, that's what I was hoping for - the last thing I want to hear is 'they all do that', but wanted to check !
Richard
2019 M3W
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Joined: Jun 2012
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Talk Morgan Expert
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Talk Morgan Expert
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This has happened to other M3W's but is not "normal" or acceptable. There should be 330 ml of oil in the bevel box, if it is overfilled this can cause leaks. If the input shaft seal needs replacing it can be done in situ, the big retaining nut is a LH thread and you will need to make a gag to hold the flange. Use a Viton seal with a higher temperature rate than the original failed one, size is 55x42x8mm R23 double lip but check dimensions as there are possibly two different sizes used. Mark the nut in relation to the shaft so you can refit to the same position and preload. It all worked well when I did it. Use some silicone sealant on the splines on assembly. ![[Linked Image]](https://www.tm-img.com/images/2020/01/13/DSC05176.jpg)
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Happened to mine three times, twice under warranty then out of warranty when had a new oil seal fitted.
I dont overfill the box.
On this basis, I am expecting it to happen again - any chance of a detailed write up for the Bulletin please Ian?
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Talk Morgan Addict
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Talk Morgan Addict
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Mine has no leaks at 1750 miles.
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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Talk Morgan Expert
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Talk Morgan Expert
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40000 miles without leak.
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No jaw marks on the input shaft then Planenut? 
Andy
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Joined: Jun 2012
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Talk Morgan Expert
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Talk Morgan Expert
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Only top quality engineering here  . I will give it a go Nippy.
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Joined: Jun 2012
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Thanks for the info everyone, awaiting dealer response now.
Richard
2019 M3W
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