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ashtrans
Site Sponsor

Member Since: 08 Nov 2008
Location: Harpenden
Posts: 257

MT82 common failures

Hi,

as we do more and more of these 6 speed gearboxes we getting to see repeat failures which helps us build a picture of what to watch out for when inspecting, what parts to stock and also lets us help diagnose issues more accurately for the customer,

apart from the well documented output shaft failure we see many issues around the front end of the box,

starting at the front and working back, a common one is the spigot bush failing and chewing up the end of the pinion :

Click image to enlarge

towards the rear of the pinion you have the gear teeth which mate with large gear thats pressed (no spline, plain bore interference fit) on the front of the layshaft, both of these can wear through on the gear teeth, especially when run low on oil as these are in constant mesh taking load in all but 5th,

The pinion is supported with a quite large NSK ball roller bearing, these also fail, one I split earlier !

Click image to enlarge

the inside of the outer wasn't too bad but the balls and the outside of the inner are awful, this must of been noisy !!

notice how one side of the inner is not too bad but the other side is very bad, I suspect this is due to the end thrust that the helical gears create, we also see this on the LT85 that has ball bearings, a decent taper roller bearing would last better but would require more time and skill (cost) to assemble, I wonder if this is why the ball bearings were used.

The two 6th gears also wear out and due to the prices from landrover we have invested quite a lot in making our own.

We also have many in due to the selector rails jumping and jamming them in gear, usually 1st, a fix is on ours FAQ's,

Some come in with big holes in the right hand side, prop UJ's letting go,

thats most of the common ones, hope you found it interesting !!

Dave Ashcroft

30th Jan 2019 7:29pm

AndrewS

Member Since: 10 Apr 2007
Location: Hereford
Posts: 3707

2013 Defender 130 Puma 2.2 SW Rimini Red

Very interesting

Keep the posts coming

130's have feeling's as well you know

30th Jan 2019 7:37pm

Big Harold

Member Since: 09 Jul 2018
Location: nsw
Posts: 71

2015 Defender 130 Puma 2.2 HCPU Alpine White

Hi Dave I fitted my oil impregnated bronze spigot bush we will see how it gous.
Mark

30th Jan 2019 7:51pm

williamthedog

Member Since: 29 Dec 2012
Location: south wales
Posts: 3441

A really reliable gearbox then.

30th Jan 2019 7:51pm

Bluest

Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4209

2007 Defender 110 Puma 2.4 XS CSW Java Black

Great info, more posts like this would be appreciated. 2007 110 TDCi Station Wagon XS

30th Jan 2019 7:53pm

SimonDavies

Member Since: 15 Mar 2012
Location: Swansea
Posts: 244

2010 Defender 90 Puma 2.4 HT Zambezi Silver

What sort of mileage was the gearbox above?

30th Jan 2019 8:01pm

Co1

Member Since: 19 Aug 2018
Location: North Yorkshire
Posts: 3675

As above, what was the mileage? The pitting on the bearing race is rediculous!

30th Jan 2019 8:15pm

LR90XS2011

Member Since: 05 Apr 2011
Location: bickenhill
Posts: 3641

2011 Defender 90 Puma 2.4 XS CSW Galway Green

thanks Dave

you have built a couple of diffs for me with your ATB centres all good so far, and amazing difference on wet grass

cheeky I know but any chance of a forum discount on your modified gearbox to transfer box adaptor shafts?

I would like to buy one now just in case I need it in the future, a good discount would just be enough to prompt me to do just that (and would allow me to justify it to myself) DEFENDER 90 TDCI XS,

I hope everyone is well and your land rovers make you happy

30th Jan 2019 8:15pm

ashtrans
Site Sponsor

Member Since: 08 Nov 2008
Location: Harpenden
Posts: 257

Hi,

glad you found it interesting,

sorry I don't know the milage, we rarely get that info, the old unit just gets sent back for credit often through another party,

PM me for a output shaft kit price, Dave

30th Jan 2019 8:43pm

RobKeay

Member Since: 19 Jul 2009
Location: Stafford
Posts: 1579

2014 Defender 110 Puma 2.2 USW Corris Grey

I fitted an Ashcroft output kit. Nice piece of kit and 20k miles no problems and less clonking.

30th Jan 2019 8:55pm

MK

Member Since: 28 Aug 2008
Location: Santiago
Posts: 2415

2007 Defender 110 Puma 2.4 SW Chawton White

So the Puma is likely becoming as the worst ever Defender model. Just after Toyota of course. Puma 110" SW

.............................................................
Earth first. Other planets later

30th Jan 2019 9:30pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17382

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

^^^ A rather extreme conclusion, perhaps! In most respects the Puma is the best Defender of them all.

30th Jan 2019 10:25pm

MK

Member Since: 28 Aug 2008
Location: Santiago
Posts: 2415

jeez. Puma 110" SW

.............................................................
Earth first. Other planets later

30th Jan 2019 10:38pm

BogMonster

Member Since: 05 Feb 2008
Location: Stanley
Posts: 400

2015 Defender 110 Puma 2.2 USW Corris Grey

Ooo bearing spalling, lovely! Could have come out of a Super Puma chopper

Sounds like the MT82 is no better than what it replaced, the gearchange in mind is certainly way worse than the R380 in my 300Tdi so not a surprise that the rest is in the same category!

Interesting info, thanks

---
2006 Defender 110 SW 300Tdi • 2011 Ford Ranger XLT crewcab • 2015 Defender 110 Station Wagon Utility TDCi

30th Jan 2019 11:28pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17382

Perhaps there's really not much difference between any of them. The MT82 in my Puma is a vastly nicer box to drive than the R380 in my Td5 Disco (possibly the least pleasant box I've owned in over 40 years). Both have done similar mileages (well over 200k miles) and the MT82 is still smooth and quiet but the R380 randomly sounds like a coffee grinder.

I guess there are good and bad examples of both, and we're all prone to judge from our own experiences. Personally I'd sooner have an MT82 than an R380 anyday.

30th Jan 2019 11:55pm

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