Member Since: 13 Jun 2010
Location: Sheffield
Posts: 86
Front diff settings
Hi, does anyone know the backlash and preload settings for a front diff
Local mot station has damaged mine doing a brake test and he's attempted to rebuild it
I don't think it has been done correctly. When asked what he had preloaded to abd backlash I was told 19ft/lb and 6 thou backlash
Can move the front propshaft 1/8 of a turn so more than 6 tho backlash ???
Thanks
Aaron
19th Sep 2014 7:02 am
armalites
Member Since: 17 Aug 2013
Location: Herefordshire
Posts: 1918
Hi Aaron, the guy should have known better. He should get you a proper recon unit or new one.
I assume it he put it on the brake rollers?IID PRO
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Nanocom One
19th Sep 2014 8:04 am
nighthawk
Member Since: 24 Jul 2010
Location: Malta
Posts: 1163
There are no official figures for backlash and preload settings as LR only sell the diff as an entire assembly. This is the biggest problem people face when their diff becomes noisy. The only problem with a noisy diff is usually a noisy bearing, but without backlash and preload settings it is hard to put it back correctly.Dennis
2006 Discovery 3 TDV6 Commercial Manual Buckingham Blue
19th Sep 2014 10:05 am
Beretta
Member Since: 11 Oct 2012
Location: Rochdale
Posts: 1180
How did they damage the diff?
19th Sep 2014 10:44 am
Scarab
Member Since: 11 Jun 2011
Location: Hastings
Posts: 1283
If you're not happy the job has been done properly then give him chance to rectify it or he needs to get you a new diff.
If he doesn't know enough that you have to do the legwork to ensure it's been put right then I suggest getting a new one fitted, possibly elsewhere at his cost, is the only correct option.
19th Sep 2014 10:57 am
jonnybgud
Member Since: 18 Dec 2013
Location: Leicestershire
Posts: 397
this has got me worried now, mot is due on my D3 this month... can they really it up testing the brakes?Admin on Facebook Discovery 3 & 4 Ownersgroup
Cambelt, Fuel Pump Belt, Oil Pump & Water pump replaced by Flack
Member Since: 11 Oct 2012
Location: Rochdale
Posts: 1180
Thats my worry. Mine is booked for a few weeks and want to know how they can f'it up..
19th Sep 2014 11:10 am
Cellerdweller
Member Since: 05 Oct 2012
Location: Macclesfield
Posts: 1315
On the vt 40 it gives specific instruction how to conduct the brake test
It should be done on the road using a decelarometer .You're not afraid of the dark are you ?
19th Sep 2014 12:15 pm
Allan_T
Member Since: 10 Sep 2012
Location: Northampton
Posts: 1034
The brake efficiency test is conducted using a decelorometer while on a road test. IIRC the system should warn the MOT tester that the vehicle cannot be tested on a two wheel rolling road.GAP IID Pro Multi Vehicle Defender L316 2007-2015 - Discovery 3 - Discovery 4 - Discovery Sport L550 - Freelander 2 - Range Rover Evoque L538 - Range Rover L322 - Range Rover L405 - Range Rover Sport L320 - Range Rover Sport L494 Electrical Fault Diagnostics
19th Sep 2014 12:20 pm
Scarab
Member Since: 11 Jun 2011
Location: Hastings
Posts: 1283
4x4's should be tested using a Tapley Meter / Decelerometer. Not be tested on rollers
I believe that is the standard config as in the "handbook"
There are some rollers which I understand are suitable for 4x4's but all MOT test stations must be equipped with a Tapley Meter to conduct on road brake tests of vehicles with permanent 4WD.
If you don't know the garage doing the MOT then ring up in the few days leading up to it and ensure they know that it is a permanent 4WD vehicle and ask if they have the facilities to test it off rollers.
It's mainly vehicles with viscous couplings that are at risk however I personally wouldn't want to take that chance.
19th Sep 2014 12:23 pm
Allan_T
Member Since: 10 Sep 2012
Location: Northampton
Posts: 1034
Re: Front diff settings
aaronbott wrote:
Hi, does anyone know the backlash and preload settings for a front diff
Local mot station has damaged mine doing a brake test and he's attempted to rebuild it
I don't think it has been done correctly. When asked what he had preloaded to abd backlash I was told 19ft/lb and 6 thou backlash
Can move the front propshaft 1/8 of a turn so more than 6 tho backlash ???
Thanks
Aaron
I thought pinion bearing preload was normally measured in in/lbf not ft/lbf, did he replace the crush sleeve?GAP IID Pro Multi Vehicle Defender L316 2007-2015 - Discovery 3 - Discovery 4 - Discovery Sport L550 - Freelander 2 - Range Rover Evoque L538 - Range Rover L322 - Range Rover L405 - Range Rover Sport L320 - Range Rover Sport L494 Electrical Fault Diagnostics
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this has got me worried now, mot is due on my D3 this month... can they really 
it up testing the brakes?
