5g Gearbox service (sort of)

[W1ghty]

Just spent a couple of hours sweating in the heat under the car . Front wheels on wheel ramps (drive is sloped so it sort of makes the gearbox level ) .
I had bought a Febi filter and sump gasket kit for £10 ish recently , I was going to save it for a while but there wasn’t much wind today so I thought better in the car than in the garage . I have 8L of Fuchs 236.14 on the shelf as well .
Last ATF and filter change was @79k and 3 years ago ….now on 97k . I actually change the sump ATF yearly with a Pela pump anyway so this wasn’t too excessive for me . I did change the gearbox electrical connection last year so actually missed my normal ATF change anyway .
Much easier than the 7g to change and I’d done it a couple or so times before ,so no stress involved .

The sump tray is with magnets removed and before cleaning , no metal horrors were spotted .


I will check the level in a couple of days , I just replaced the 3L of atf I drained out

 

[Boffin486]

Just spent a couple of hours sweating in the heat under the car . Front wheels on wheel ramps (drive is sloped so it sort of makes the gearbox level ) .
I had bought a Febi filter and sump gasket kit for £10 ish recently , I was going to save it for a while but there wasn’t much wind today so I thought better in the car than in the garage . I have 8L of Fuchs 236.14 on the shelf as well .
Last ATF and filter change was @79k and 3 years ago ….now on 97k . I actually change the sump ATF yearly with a Pela pump anyway so this wasn’t too excessive for me . I did change the gearbox electrical connection last year so actually missed my normal ATF change anyway .
Much easier than the 7g to change and I’d done it a couple or so times before ,so no stress involved .
View attachment 142071
The sump tray is with magnets removed and before cleaning , no metal horrors were spotted .

View attachment 142072
I will check the level in a couple of days , I just replaced the 3L of atf I drained out

Jobs a good un!
When I first got my Coupe (about 2 Years ago), I went for a full flush (the stuff that came out was clearly the original & was very dark brown in colour) which I was real happy to complete (after using about 25 litres of oil) & ended up with with nice fresh cherry red oil in the gearbox which worked much more smoothly afterwards.
Jump forward to about 2 months ago, was just about to go for an MOT & decided to finally heed the 'Top up Coolant' warning on the dash. Take off filler cap, Lo & Behold......... Strawberry milkshake of death in side! NOT a happy bunny. Gearbox oil & coolant totally mixed together after cooler failure.
Its taken many flushes of the engine to get all traces of it out (I used a strong mix of dishwasher powder in the water) and a final few clean water flushes to be sure - reckon my cooling system is as good as new now! Just have to put the nrew radiator in to finish.
I'm currently in the process of changing the gearbox for a good 2nd hand one (the clutches in the existing original one have basically dissolved) but not till I've fitted a new conductor plate & tested all the solenoids first. I'll do a write up about it once car is going again.

 

[W1ghty]

Just done a 20 minute drive , level checked and 0.5L added . That’s it for another year .
Ive got the E class 7g box to do now

 

[boxer 01]

Just done a 20 minute drive , level checked and 0.5L added . That’s it for another year .
Ive got the E class 7g box to do now

How difficult is it to do the 7g mate, from what I've read refilling oil is the tricky bit.

 

[W1ghty]

How difficult is it to do the 7g mate, from what I've read refilling oil is the tricky bit.

It’s ok if you set aside 2-3 hours as a diy’er . I’ve done it twice before . The refilling bit I use a cheap transfer pump from eBay with a turn off valve plumbing fitting which connects to the screw in attachment that goes into the sump plug hole . I’ll see if I can find a picture .
You just need to pump in 4L , turn off the valve to trap the ATF in the sump , run the car through the gears , wait until the gearbox temp is up to 80 degrees I think ( using an icarsoft ) , then release the valve below the sump until all excess fluid slows to a trickle , then quickly fit the sump plug .
This thread was my first go a few years ago

Mercedes E320cdi 722.9 DIY Gearbox oil change

Just finished the gearbox oil change . I'm embarrassed to say it probably took about 5 hours over yesterday afternoon and this morning . God know where the time went , probably lots of tool retrieval from the garage and a healthy dose of second guessing . I didn't intend to start yesterday ...

forums.mercedesclub.org.uk

 

[boxer 01]

What screwthread is the sump plug where you filled the new oil, just trying to figure out what fittings I would need. I have a small 12v pump which I sometimes use for draining oil after a good clean no reason why I couldn't use it to fill oil.

 

[W1ghty]

What screwthread is the sump plug where you filled the new oil, just trying to figure out what fittings I would need. I have a small 12v pump which I sometimes use for draining oil after a good clean no reason why I couldn't use it to fill oil.

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[boxer 01]

Thankyou and good write up in 2019. I would probably use an infa red thermometer as I don't own an icarsoft. My fluid was done a couple of years back so I'm not in a rush but if and when I decide to do the job will keep you posted.
Next project is new springs and shocks all round, awaiting Autodoc delivery, I really can't work out if it is wise doing it in this heat as the unit I'm going to be using has glass in the roof and is warm anyways.

 

[W1ghty]

Thankyou and good write up in 2019. I would probably use an infa red thermometer as I don't own an icarsoft. My fluid was done a couple of years back so I'm not in a rush but if and when I decide to do the job will keep you posted.
Next project is new springs and shocks all round, awaiting Autodoc delivery, I really can't work out if it is wise doing it in this heat as the unit I'm going to be using has glass in the roof and is warm anyways.

Cheers buddy .
You could wait until winter if it’s too hot now
Good luck with it all .

 

[W1ghty]

CORRECTION …..to the 7g gearbox temperature it’s 45c ! (I was mixing it up the 80c temp that the 5g is checked hot on the dipstick )

 

[W1ghty]

I’m beginning to suspect mental issues
CLK ATF history
35k MB gearbox service
40k ATF sump change , me
56k Sump+ filter ,me
62k ATF sump change ,me
73k “
79k Sump+ filter ,me
86k ATF sump change ,me + electrical connector
92k. “
97k Sump+ filter , me
I think that covers it ! No surprises it shifts well