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Rallyneil
Member Since: 19 Aug 2015
Location: Scottish Borders
Posts: 33
  
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| Gearbox/Transfer box whine? help please |
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Hi All,
D3 SE auto 06
I have had a roadspeed related noise for a while, which i was having trouble tracing. we found a knackered front N/S wheel bearing and replaced that but the noise remains.
I should also say that i have had the bearings in the front diff 30000 miles ago
The whine is very noticeable above 30MPH and is a constant high pitch drone that doesn't alter with side loads. However, tonight i tried the car in low range and the noise is much more pronounced and higher in pitch. Does this point to a noisy bearing in the transfer box perhaps?
Any help gratefully received.
Merry xmas
Neil
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 22nd Dec 2017 10:18 pm |
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hugeviking
Member Since: 08 Jun 2010
Location: cotswolds
Posts: 1482
 
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Same symptoms when my transfer box needed swapping im afraid 
Coasted in neutral, noise still there, changed rear prop as centre bearing was past best, noise still there.
May be worth checking prop, but the change in tone/sound when changing to low range is a giveaway to me, sorry.
Obviously get checked before spending 
Andi.
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| 22nd Dec 2017 10:44 pm |
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Rallyneil
Member Since: 19 Aug 2015
Location: Scottish Borders
Posts: 33
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Prop was also changed at last mot. Not sounding good is it!
Think I will drop the transfer box in the new year and try a bearing kit.
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| 22nd Dec 2017 10:58 pm |
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hugeviking
Member Since: 08 Jun 2010
Location: cotswolds
Posts: 1482
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Well at least you can hopefully save a bit doing it yourself.
NB, after it has been repaired it will presumably need re-calibrating ??
Andi.
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| 23rd Dec 2017 10:50 am |
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Nc1989
Member Since: 28 Apr 2015
Location: Doncaster
Posts: 203
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Transfer box rebuild I found really easy to do. I did it a couple of years ago sourcing the bearings myself as no one did a rebuild kit at the time, cost me more for the special transfer box oil than for the bearings! I followed this guide which was great:
http://www.rangerovers.net/forum/6-range-r...pics/41233
All the best with it when you come to doing it
Cheers, Neil.
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| 23rd Dec 2017 11:16 am |
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Rallyneil
Member Since: 19 Aug 2015
Location: Scottish Borders
Posts: 33
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Yeah that’s the guide I was looking at, doesn’t appear to be too difficult.
I’m assuming, probably incorrectly that the recalibration is for the position sensor that tells the car whether it’s in high or low range?
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| 23rd Dec 2017 11:37 am |
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Nc1989
Member Since: 28 Apr 2015
Location: Doncaster
Posts: 203
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The calibration people usually refer to is for the centre diff ‘clutch’ as I think it has been known to cause transmission wind up during tight turns after some mileage and other symptoms. A recalibration sorts all that out and allows for any wear.
When you refit the transfer box it should go through a cycle automatically to learn high and low box positions anyway, that is what mine seemed to do at least. I’d have been driveable without any diagnostic intervention basically. Probably worth getting it plugged in anyway though for a recalibration after a tear down and new oil.
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| 23rd Dec 2017 11:58 am |
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lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
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Nc1989 wrote:Transfer box rebuild I found really easy to do. I did it a couple of years ago sourcing the bearings myself as no one did a rebuild kit at the time, cost me more for the special transfer box oil than for the bearings! I followed this guide which was great:
http://www.rangerovers.net/forum/6-range-r...pics/41233
All the best with it when you come to doing it
Cheers, Neil.
Excellent link
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| 23rd Dec 2017 2:09 pm |
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Rallyneil
Member Since: 19 Aug 2015
Location: Scottish Borders
Posts: 33
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Well, thought i would update on this.
Today i removed my old knackered Transfer box and replaced it with a good low mileage box which has transformed the car 8)
I started by removing plastic transmission cover and the sump guard.
Next the gearbox crossmember and lower transfer box/gearbox mount. This looked like it might prove problematic as the crossmember bolts were pretty crappy looking - but happily all came out without too much of a fight.
Next up i took of the 18mm bolt that passed through the gearbox mounting and 4 x 13mm bolts that hold the mount to the TXB. These all came out without any problems at all.
I then removed the rear prop which was no problem and front prop (which was a nightmare to get out from between the TXB and front diff).
This left the transfer box supported by a transmission stand. We managed to lower the complete TXB and gearbox by a few inches which gave us just enough room - and i mean 'just'!! to get at the upper 4 13mm bolts. The lower 4 bolts came out pretty easily. Lastly i disconnected the breather hose from the upper casing.
After all that the TXB came back a few inches to seperate it from the gearbox and it just lowered out very easily. There is a lot of room to work with!
reassembly was very easy and as per the old haynes saying was just a reversal of the removal 
The old box was making some very rough bearing noises and i am happy to say the new one is quiet and smooth.
The only small issue is that the box was initially causing a bit of wind up which has calmed down after a short drive but it makes a decent clunk when you switch the engine off. I am going to try and re calibrate the box tomorrow and fingers crossed it will be as good as new.
Next up is a transmission oil pan and filter replacement and a Filo oil replacement.
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| 24th Jan 2018 11:07 pm |
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