SLK 350 7G-Tronic ATF oil change adaptor.

[james2747]

I'm intending to do an ATF and filter change on the 'other halves' SLK 350.
Its a 2006 model and I suspect ATF has never been changed (she got it in 2010) but has only done 38,000 miles in total.
I've done ATF changes on older Mercs with 5 speed auto boxes but the SLK w'shop manual says I need a pressure pump, infra red thermometer and adaptor.
I can cobble the pressure pump from a decent garden sprayer (worked fine on other models) but adaptor looks like it screws in to the sump plug threaded hole.
Is one of these adaptors available to buy anywhere without costing a fortune ... so that probably rules out the MB Dealer ... as I'd rather not risk making a bodge job myself.
Any other hints, warnings, recommendations on doing this job would be welcomed.

 

[Blobcat]

@Wighty is your man for ATF changes on the 7G box

 

[Wighty]

https://forums.mercedesclub.org.uk/...-e320cdi-722-9-diy-gearbox-oil-change.175024/
This was my gearbox attempt as a first timer on the 7g .
The sump gearbox adapter was an eBay special, I’ll try and find a link for you

 

[Wighty]

http://www.ebay.co.uk/itm/1Pcs-Auto...-Benz-722-9-/282545270443?hash=item41c902aeab
I haven’t shopped around for you , but this is one of them

 

[Wighty]

https://www.ebay.co.uk/itm/Deluxe-S...119280&hash=item1a197a5a48:g:yuUAAOSwHo5ajDq9
this pump is good for the job , you need a fluid isolating valve for just below the sump , I think I mentioned this in the thread.
Also YouTube has loads on the 7g oil change

 

[D5meister]

Its an M12x1 metric thread. I used a pneumatic/hydraulic adapter for £2

 

[Mark A]

You can buy the kits online pretty cheap these days with adapter, valve and pump.

 

[james2747]

Thanks Wighty
A good write-up on 'how to do it' and links to the bits required ... that is above and beyond the call of duty ... and much appreciated.
I think the hardest part for me will be getting the car up high enough so I can get at everything easily ... and keeping it level at same time ... plus monitoring the temperature.
How critical is the temperature?
I would try my best to monitor temperature using an infra red thermometer but for instance if oil got to say, 50 degrees, rather than the 45 degrees you state in the procedure, before I got everything done and sump plug back in ... would it make much difference?

 

[Wighty]

Thanks Wighty
A good write-up on 'how to do it' and links to the bits required ... that is above and beyond the call of duty ... and much appreciated.
I think the hardest part for me will be getting the car up high enough so I can get at everything easily ... and keeping it level at same time ... plus monitoring the temperature.
How critical is the temperature?
I would try my best to monitor temperature using an infra red thermometer but for instance if oil got to say, 50 degrees, rather than the 45 degrees you state in the procedure, before I got everything done and sump plug back in ... would it make much difference?

You are welcome (other helped me , so I’m just “paying it forward ) .
Axle stands and or wheel ramps as a combination is high enough to work . As to temperature , there is no reason why you can’t be almost exact because all you have to do is release excess oil by opening a valve when you hit your desired temperature , when the escaping oil slows to a trickle unscrew the adapter and put the sump plug in .
The only problem I had once was I didn’t have enough oil in when I released the valve so I had to refill with an extra Litre of oil and then wait for the gearbox to cool slightly before trying again .
If you have to buy ramps, stands etc you need to weigh up the cost of doing the job yourself against an Indy doing it . My diy cost was slightly over £100 I think . For me though I wanted to learn more for the future and increase my confidence so the cost didn’t really matter

 

[steveq]

Hi,

The iCarsoft i980 has a display showing the gearbox temp. That should be more accurate than an IR thermometer.