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Aug 24th, 2023
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Joined: Oct 2007
Posts: 423 Likes: 2
Learner Plates Off!
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Learner Plates Off!
Joined: Oct 2007
Posts: 423 Likes: 2 |
I did a 380 mile round trip today to a small diner in the middle of nowhere in northern Wisc. I normally wear earplugs, but at about 65mph I pulled out one plug, and no whining or screaming at all. This is with about 8000 miles on the M3W. It has finally gone quiet! I am convinced that the gears do eventually lap in, and quite down at some point. Ambient temp today about 82F. Mine is quiet at 65mph also, it is from 45-60mph that it really screams
Lance
1981 Plus 8
2016 Three Wheeler
2022 Corvette Stingray Convertible z51
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Joined: Apr 2008
Posts: 11,861 Likes: 137
Scruffy Oik Member of the Inner Circle
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Scruffy Oik Member of the Inner Circle
Joined: Apr 2008
Posts: 11,861 Likes: 137 |
I reckon somebody could make a good income manufacturing running-in rigs for these bevel boxes. Remove them from the car, mount them on the rig, spin them up to about 10,000rpm for a few days, ideally with a recirculating oil supply with filtering and cooling.
Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE
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Joined: May 2012
Posts: 1,789 Likes: 3
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: May 2012
Posts: 1,789 Likes: 3 |
IMHO the NVH kit is a boat anchor.
Would it be a brave person to mix some carborundum lapping paste with the EP140 and run it for a few miles at different speeds then flush completely an re-fill with new oil as an experiment?
Might not do the bearings nay good though.
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Joined: Jan 2014
Posts: 1,075
Has a lot to Say!
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Has a lot to Say!
Joined: Jan 2014
Posts: 1,075 |
IMHO the NVH kit is a boat anchor.
Would it be a brave person to mix some carborundum lapping paste with the EP140 and run it for a few miles at different speeds then flush completely an re-fill with new oil as an experiment?
Might not do the bearings nay good though. I know people say the "wear in", but with lapping compound in the BB itself, you still have the bearings and seals that would have the same wear in as the gears. My belief on the specialty guys doing the lapping, they have fixtures that hold the individual gears outside the BB and then reset the backlash and gear depth when re-assembling the BB. They would also probably vary the depth and the centering of the pattern so as to have a smooth gear face slightly larger than the final setup face to face area. Even when they wear in naturally, my guess is that the backlash will become slightly more due to the slight wearing in of the gear surface. I think it would be best left to a professional to do the lapping.
Dan
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Joined: Mar 2016
Posts: 213
L - Learner Plates On
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L - Learner Plates On
Joined: Mar 2016
Posts: 213 |
IF I were to lap the gears with compound, I would do it right in the box. Then I would plan on replacing all the bearings and seals and start fresh.
Inge
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Joined: Jan 2014
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Has a lot to Say!
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Has a lot to Say!
Joined: Jan 2014
Posts: 1,075 |
IF I were to lap the gears with compound, I would do it right in the box. Then I would plan on replacing all the bearings and seals and start fresh. That's one way to do it. But as the gears polish in and there's no means to increase the depth or keep the gears under pressure during the process. You are correct though, afterwards just replace bearings and seals with a proper setup of pinion depth and backlash.
Dan
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Joined: Jul 2015
Posts: 2,539
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jul 2015
Posts: 2,539 |
I wonder if the factory or G56 have found the answer?
kirkusblog.com
2016 M3W John A Prestwich Special
1952 Ford 8N
1968 Honda CL175,and 2018 Ural Retro
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Joined: Nov 2011
Posts: 7,060 Likes: 20
Talk Morgan Guru
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Talk Morgan Guru
Joined: Nov 2011
Posts: 7,060 Likes: 20 |
The cost to remove the bevel box have the gears lapped and re install was $1,300.00. Once the bevel box gear set is lapped they are a matched set and there is very little noise from the bevel box. The 3 Wheeler is a joy to drive without the bevel box scream, at 110 klm per hour it was howling like a banshee, now just the wind and the engine song.
Good to find a fellow Ozzie and hear you are getting on top of the M3W issues. Are you coming to the Morgan Muster in October ? Enjoy the quiet ride...
A Morgan Identified Fastidious Owner...
2011 4/4 Bespoke, 1981 Delorean, Auburn Boat Tail
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Joined: Oct 2012
Posts: 6,538
Talk Morgan Sage
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Talk Morgan Sage
Joined: Oct 2012
Posts: 6,538 |
What I find incredible is that 7 years after launch of The M3W this issue is still not factory fixed.
Lots of respect for those on here with the will and the skill to fix the BB themselves - well,at very least make it bearable.
Last edited by NeilL; 12/04/18 06:42 AM.
Neil
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Joined: Oct 2015
Posts: 1,490
Has a lot to Say!
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Has a lot to Say!
Joined: Oct 2015
Posts: 1,490 |
My 2016 was almost silent when new and just keeps getting quieter.
The Original Ken
11,000 miles.
2014 BMW R9T
2005 Saabaru
2005 Saabaru
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