Tranmission Oil Change - PeachParts Mercedes-Benz Forum

Schr91 · #1 08-09-2008, 01:33 PM

Well I was wanting not to ask for fear of sounding ignorant. This is my first transmission oil change on my Mercedes. I am having issues getting to the torque converter. The manual says to turn the crankshaft pulley... how in the world do I do that! I've tried and I am getting no where. Some help would be greatly appreciated on how to get the crankshaft pulley to move so I may gain access to the converter. (P.S. I have searched many threads and can't find related material... seems everything but)

Thanks in advance!

Shea

rgnprof · #2 08-09-2008, 02:31 PM

I turn mine with a 27 or 28MM deep well 1/2" socket - I think 1 1/16" might work as well (but I'm not exactly sure what size socket you will need). You are looking for the bolt in the center of the crankshaft pulley and will probably have to work your socket wrench in behind the fan - you may not be able to see it and will have to work the wrench on by feel. Make sure you turn the engine clockwise...

ryan

deanyel · #3 08-09-2008, 02:49 PM

Some people do this by simply hitting the starter until the drain plug lines up. This obviously is better done with an assistant.

280EZRider · #4 08-09-2008, 03:38 PM

Only 27mm will work on the crank bolt. On some models, you can also use a 22mm open-end wrench and turn the engine by the power-steering pump. (This method also works well for valve adjustments). But first, remove the spark plugs to avoid doing battle w/the compression.

Arthur Dalton · #5 08-09-2008, 04:06 PM

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Either work.

27 MM is equal to 1-1/16" ...

27MM= 1.062"
1.062" =1-1/16"

280EZRider · #6 08-09-2008, 06:36 PM

Quote:

Originally Posted by Arthur Dalton

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Either work.

27 MM is equal to 1-1/16" ...

27MM= 1.062"
1.062" =1-1/16"

"27mm only" was in reference to the 28mm-statement made earlier - not the 1 1/16 statement. I suppose a 28mm might work, which would be a 1/2 @ed approach because it's going to slip & slide during the process of messing up the head of the bolt.

Arthur Dalton · #7 08-09-2008, 08:51 PM

And I was referring to the fact that the 1-1/16 and 27 MM are exact interchange..one of the few/ rare same size on MM/Inch conversion.
I mention that only b/c many USA guys do not have that large a Metric/MM set. but are likely to have Inch sizes...
..so, the message is don't go out a buy a 27MM metric socket simply b/c you may be unaware that the alternative could be right there in your tool box..

...but most guys already know that...........................

emerydc8 · #8 08-10-2008, 02:50 AM

I had the 1 -1/16" and thought I'd better get the 27 mm, because there was going to be over 250 Newton Meters of torque on the crank bolt and I didn't want to strip it. As I recall, the American 1 -1/16" actually fit better. Now I have both. Oh well.

280EZRider · #9 08-10-2008, 01:11 PM

Quote:

Originally Posted by emerydc8

I had the 1 -1/16" and thought I'd better get the 27 mm, because there was going to be over 250 Newton Meters of torque on the crank bolt and I didn't want to strip it. As I recall, the American 1 -1/16" actually fit better. Now I have both. Oh well.

And for this very reason, it's better to use a 6-point rather than a 12-point socket.

Schr91 · #10 08-10-2008, 03:18 PM

You guys are great as always an invaluable resource. Few cranks and the torque converter is in my view and being emptied.