Changing the oil in the ZF 6 Speed Gearbox

MC_Bob

Member
Messages
133
Yo,
Done an oil change on the gearbox. They have some common faults which are just seals that let by. I replaced the Sleeve which holds the connector, 4 oil rubber inserts, mechatronic seal, and filter. You also need 10 liters of ZF fluid (7 if your tight) and pan gasket. Cost me £270 for all genuine parts.
You need a couple of 8mm allen keys which you can cut to be the right size if you dont want to move the exhaust.

Theres a lot of generic tutorials on youtube, theyre the same for our QP5s. The biggest paid was how close the exhaust was to the filler plug and electric cable. Both are possible as I done it, but make sure you can get the filler plug back in with your allen key as you cant get your fingers up there as the exhaust is so hot, Ive got the burns to prove it.

I filled it initially but couldnt get the plug back in, so then let the car run for twenty minutes and drained 2 liters out whilst I made a shorter allen key. Then refilled and plugged it. Helped get some more of the old oil out.

I didnt have any issues with the gearbox at all, but its done 65k, and although officially it seems to be a lifetime oil which doesnt need changing, I went ahead.

Some pics!

Leftover new oil V oil removed from the box


IMG_20190104_205452.jpg

The old seals removed:
IMG_20190104_205436.jpg
Pan removed, mechatronic panel to be removed:
IMG_20190104_150233.jpg


Panel removed, lots more fluid comes out . Ive fitted the 4 new seals and the panel seal:
IMG_20190104_143259.jpg

Mechatronic plug:
IMG_20190104_140321.jpg

And the socket in the gearbox:

IMG_20190104_140315.jpg
 

MC_Bob

Member
Messages
133
You have to be quite meticulous. But it's very simple, about 4 hours start to finish. And you need lots of rags and towels!
Next is the diff, it's been done in the past but I would like to do it.

Most garages aren't interested in these sorts of jobs from what I found.
 

MC_Bob

Member
Messages
133
I've since been told on the sump there is a secondary fill port which I saw but didn't know it can be used to set up final fill level. Much easier!
 

voicey

Member
Messages
660
If you've filled from the side of the gearbox (based on your description of it being near the exhaust) then you've used the wrong hole. There is a second plug next to the drain hole that is used to fill. The procedure to get the level correct is mildly involved and requires the use of a diagnostic tool. Getting it wrong commonly leads to an under-fill which is a very bad thing.

Having said that, if you've filled from the side then I suspect you have over-filled which isn't as bad.
 

MC_Bob

Member
Messages
133
If you've filled from the side of the gearbox (based on your description of it being near the exhaust) then you've used the wrong hole. There is a second plug next to the drain hole that is used to fill. The procedure to get the level correct is mildly involved and requires the use of a diagnostic tool. Getting it wrong commonly leads to an under-fill which is a very bad thing.

Having said that, if you've filled from the side then I suspect you have over-filled which isn't as bad.
Hello.
And what procedure might that be.
The sump fill point and side fill are both valid fill levels at 40-50 fluid temperatures. I just used a harder to get to method.
I haven't overfilled since my removed quantity and used quantity are near enough exact.
 

Carmico

Junior Member
Messages
33
i want to do it on mine too

there are some kits on eBay for the ZF 6HP26 (metal sump), can i ask you where do you get everything ?

thanks
 

Michael

Member
Messages
340
Yo,
Done an oil change on the gearbox. They have some common faults which are just seals that let by. I replaced the Sleeve which holds the connector, 4 oil rubber inserts, mechatronic seal, and filter. You also need 10 liters of ZF fluid (7 if your tight) and pan gasket. Cost me £270 for all genuine parts.
You need a couple of 8mm allen keys which you can cut to be the right size if you dont want to move the exhaust.

Theres a lot of generic tutorials on youtube, theyre the same for our QP5s. The biggest paid was how close the exhaust was to the filler plug and electric cable. Both are possible as I done it, but make sure you can get the filler plug back in with your allen key as you cant get your fingers up there as the exhaust is so hot, Ive got the burns to prove it.

I filled it initially but couldnt get the plug back in, so then let the car run for twenty minutes and drained 2 liters out whilst I made a shorter allen key. Then refilled and plugged it. Helped get some more of the old oil out.

I didnt have any issues with the gearbox at all, but its done 65k, and although officially it seems to be a lifetime oil which doesnt need changing, I went ahead.

Some pics!

Leftover new oil V oil removed from the box


View attachment 53412

The old seals removed:
View attachment 53411
Pan removed, mechatronic panel to be removed:
View attachment 53410


Panel removed, lots more fluid comes out . Ive fitted the 4 new seals and the panel seal:
View attachment 53409

Mechatronic plug:
View attachment 53408

And the socket in the gearbox:

View attachment 53407
Great work. For those of us who have less engineering ability, is this a job that could be undertaken by a ZF gearbox specialist? Or Maserati specialist?
 

MC_Bob

Member
Messages
133
i am valutating this one

do you think it is ok? or need something else?

https://www.ebay.co.uk/itm/191915634294
Not sure why you would. The pan doesnt need changing and it doesnt include the seals above the mechatronic block.

Great work. For those of us who have less engineering ability, is this a job that could be undertaken by a ZF gearbox specialist? Or Maserati specialist?
Sure thing. I contacted ZF and they have an approved list. Ive just read a few times of lesser oils being used and being told theyre 'equivalent' on some forums. Its also trusting they will be quite particular about the fluid temperature and finished fluid level in box etc.
 

MC_Bob

Member
Messages
133
A bit of news after using it. The box shifts are tonnes better. Converter lockup isn't noticeable, whereas before in first you could feel it occasionally. Shifts in sport are noticeably shorter whereas before it was not distinguishable.
Well worth it.