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by Rex_tulips - 30/07/25 07:59 PM
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Forums34
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Most Online1,046
Aug 24th, 2023
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Joined: Feb 2019
Posts: 3,854 Likes: 2
Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
Posts: 3,854 Likes: 2 |
How much oil/lube does the BB take if you fill it?
The light at the end of the tunnel is actually a train. 2019 M3W
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Joined: Jul 2013
Posts: 3,660 Likes: 48
Talk Morgan Addict
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Talk Morgan Addict
Joined: Jul 2013
Posts: 3,660 Likes: 48 |
Red Leader 
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Joined: Feb 2019
Posts: 3,854 Likes: 2
Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
Posts: 3,854 Likes: 2 |
The light at the end of the tunnel is actually a train. 2019 M3W
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Joined: Dec 2017
Posts: 2,041 Likes: 71
Talk Morgan Expert
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Talk Morgan Expert
Joined: Dec 2017
Posts: 2,041 Likes: 71 |
I don't understand why filling the BB to the vent plug could damage the seal as the BB does not operate under pressure (hence having a vent plug). If the vent plug was removed and a modified vent tube installed going vertically you could in theory increase the volume of oil to cover the workings and still vent.
Bruce
Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
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Joined: May 2011
Posts: 1,613 Likes: 22
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: May 2011
Posts: 1,613 Likes: 22 |
I don't understand why filling the BB to the vent plug could damage the seal as the BB does not operate under pressure (hence having a vent plug). If the vent plug was removed and a modified vent tube installed going vertically you could in theory increase the volume of oil to cover the workings and still vent.
Bruce I think the problem is that the existing orange vent plug will vent air but not oil, so if it overfilled the BB cannot vent and oil then leaks from the seal.
2021 M3W
2013 M3W - Sold
1971 4/4 2 Seater
1934 Sports
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Joined: Feb 2019
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Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
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Liquids get hot and expand so if it cannot vent then the seals get stressed.
The light at the end of the tunnel is actually a train. 2019 M3W
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Joined: Jun 2012
Posts: 2,141 Likes: 43
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jun 2012
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Put the Redline 80W250 synthetic gear oil in the bevel box the other day and did my first long(ish) run today in 27c ambient temperature. Not any real change from running with the Redline Shockproof. Sad to say, it doesn't seem to be a miracle cure for noisy bevel boxes.
Another thing to consider, in reply to britmog, if you overfill a gearbox, it usually makes it run hotter because of the increased friction and drag of the extra oil. Extra heat is not what you want in the M3W Bevel Box.
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Joined: Jul 2013
Posts: 3,660 Likes: 48
Talk Morgan Addict
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Talk Morgan Addict
Joined: Jul 2013
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I spent a few hours yesterday soundproofing the aluminium rear bulhead with Silent Coat Extra 4mm.
This has made much more of an improvement in bevel box noise than either Millers 140 or Redline 250.
Red Leader
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Joined: Jul 2018
Posts: 1,031 Likes: 2
Has a lot to Say!
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Has a lot to Say!
Joined: Jul 2018
Posts: 1,031 Likes: 2 |
I spent a few hours yesterday soundproofing the aluminium rear bulhead with Silent Coat Extra 4mm.
This has made much more of an improvement in bevel box noise than either Millers 140 or Redline 250.
Do you recommend that over Dynamat?
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Joined: Aug 2009
Posts: 557
Talk Morgan Regular
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Talk Morgan Regular
Joined: Aug 2009
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I just got en email from Emil at MorganCustom.net and he had developed a remote fill kit for the Bevel Box, which increases the oil capacity to 28oz. He should publish test results and temperature readings soon
2016 M3W, Army Green Matte/Tan Leather, 17k miles
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