Quote:

Haynes Owners Workshop Manual
Land Rover Defender 2007 - 2016

Transmission (Main Gearbox) oil renewal
Unscrew the Drain Plug... allow the oil to drain...
Unscrew the Filler/Level Plug...
Fill the Gearbox... until the oil flows from the Filler/Level Plug hole...

Capacities
Main Gearbox: MT82 6 speed... 2.20 litres

Ianh wrote:

It is odd, but in the owners manual for the 2.4 on fluid change it states 2.2 L, yet in the owners manual for the 2.2 it states 2.4L for fluid change. Plus I did the first gearbox oil change on my 2.2, measured the drained fluid, and it was exactly 2.4 litres !

Also in the mustang gearbox manual it states 2.6L !

X4SKP wrote:

Dinnu wrote:

Those are very clear answers. I have used the “Not the fill plug” to re fill by box. It does look like a plug, and had no ill effects.

Interestingly, the “Not the fill plug” does not seem to show in this diagram: https://www.defender2.net/gallery/albums/u...%2BP32.pdf

Part #4, a shift fork pivot is right next to it though, and can be see in the picture in the 2nd post, but uses a larger size LN key.

Perhaps the “Not the fill plug” was an addition while the manuals guy was on vacation.

Hello Dinnu

You are right I believe... I spoke to my Independent about this today...
(as I was there at the Parts Counter, stocking up on Service Items)

The Not the Fill Plug looks to be exactly the same as the (genuine) Fill Plug T50 or H8 and is the same depth Casing Screw... I pondered over this 'arrangement' when undertaking the 1st All Oils Change on my 90... The MT82 Workshop Manual pointed me in the right direction.

The Set Screw 'next door' is Hex H12 Screw...and appears to be internal pivot point...
so leave well alone


Click image to enlarge

I know Land Rover 'inherited' this arrangement from Ford but it is somewhat confusing...
Why didn't Ford just add relief Casing Graphics saying Fill Point at the spot they identify
in the workshop manual...

My Independent confirmed either (Not the Fill Plug or Fill Plug) can be used
but be sure not to disturb the Pivot Points...

As for the differing Service Oil Fills recommended, the only thought I have... is if this is the result of differing internal Gears / Mechanisms 'taking up' more or less internal volume and there by requiring the adjustment the Oil Volume to achieve a 'balanced' operational working temperature and pressure within the Gearbox... just a thought.

Just to say 'thank you' for this discussion. I've just had the gearbox oil changed at "my indie" and I thought they had screwed up (pun intended ) because from the dirt I could telll they used the "not the fill plug". But then I remembered this thread. So all's fine.
Also, the "not the fill plug" is easier to get to, I think.

blackwolf wrote:

The biggest risk in removing the wrong thing to fill the box arises from the fact that most of the things that resemble plugs are in fact the pivots for the selector forks inside the box. There is no guarantee if you remove one of these unintentionally that you will be able to get it back in if the selector fork moves, and that probably means a gearbox strip-down.

All the selector fork pivots are symmetrical on both sides of the box, which does make it a bit easier to figure out if it is a pivot or not. They are items 3 and 5, 4 and 6, and 7 and 8 in the diagram linked below. The drain plug is item 1, the filler plug is item 2.

https://www.defender2.net/gallery/albums/u...%2BP32.pdf

Since the MT82 in the Defender is a measured-quantity fill, not a fill-to-overflow type, it doesn't really matter where you put the oil in provided that (a) you put in the right amount and (b) you don't do irreparable damage in the process.