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Forums39
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Jun 14th, 2026
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Joined: Aug 2012
Posts: 2,360 Likes: 2
Talk Morgan Expert
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Talk Morgan Expert
Joined: Aug 2012
Posts: 2,360 Likes: 2 |
Mine is quiet
With NVH And minéral oil 140
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Joined: Jul 2014
Posts: 92
Just Getting Started
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Just Getting Started
Joined: Jul 2014
Posts: 92 |
CasaLobo / 2014 / 1,400 / N / N/A / Steel / Y / Redline Shockproof
Great thread, thanks!
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Joined: Jul 2013
Posts: 3,735 Likes: 82
Talk Morgan Addict
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OP
Talk Morgan Addict
Joined: Jul 2013
Posts: 3,735 Likes: 82 |
Not very scientific but my belt tension.
In the middle of the belt there is 15mm of vertical movement whilst apply minimal force, alternatively I can twist the belt 40 degrees with some force. Prior to slackening the belt there was only 5mm maximum movement.
These results seem to pointing to the fact that temperature is causing problems with clearances and hence gear noise or insufficient preload of the pinion bearings, as the survey indicates the noise is worst when the bevel box is hot causing differential expansion between the aluminium housing and the pinion shaft. Not knowing the dimensions of the bevel box but If the bevel box is running at 120 deg C the pinion bearings are 50mm apart then the differential expansion cold to hot could be 0.06mm (0.0024 inches) which could be enough to upset the preload. This still seems pretty tight - mine twists more like 90 degrees. We can compare side by side on Sunday.
Red Leader 
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Joined: Jan 2015
Posts: 245 Likes: 5
L - Learner Plates On
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L - Learner Plates On
Joined: Jan 2015
Posts: 245 Likes: 5 |
Gates don't say much about handling the belt apart from never twist it it damages the fibres
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Joined: Jul 2013
Posts: 3,735 Likes: 82
Talk Morgan Addict
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OP
Talk Morgan Addict
Joined: Jul 2013
Posts: 3,735 Likes: 82 |
Just checked my belt - 90 degree twist and 1 inch deflection.
Red Leader
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Joined: Feb 2016
Posts: 8,706 Likes: 416
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,706 Likes: 416 |
Just checked my belt - 90 degree twist and 1 inch deflection. Wow! that's loose. Checked mine at factory after it was first fitted and tensioned - max 30° twist - still the same after 700 miles.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Mar 2015
Posts: 37
Just Getting Started
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Just Getting Started
Joined: Mar 2015
Posts: 37 |
2014 model, ab 8000 km, quiet when cold, whines when hot, original alu sprocket, no idea about the other stuff
M3W
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Joined: Nov 2013
Posts: 1,947
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Nov 2013
Posts: 1,947 |
From the Morgan PDI form
Outside the Car No 31
Drive belt tension (1/4 of a turn) & clear of the tyre.
Tim
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Joined: Dec 2014
Posts: 64
Just Getting Started
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Just Getting Started
Joined: Dec 2014
Posts: 64 |
2014 / 3500 / quiet up to 50mph, not too bad to 70 (get scared after that!) / original ally / no NVH
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Joined: Mar 2013
Posts: 722 Likes: 24
Talk Morgan Regular
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Talk Morgan Regular
Joined: Mar 2013
Posts: 722 Likes: 24 |
Just checked my belt - 90 degree twist and 1 inch deflection. If more the outside from the belt will rub on the round frame pipe on the bottom. This because when driving all slack will be on the lower part of the belt ( not pulling) this could be the reason why MMC tighten up the belt a bit more.
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