zerocover

Right so I attempted to do the fluid flush on the 4matic today. I popped open the oil filler pipe to try the dipstick first ( good thing)

It turns out the dipstick is way too long! I have PN: 140-589-15-21-00 which is recommended by other forum members and listed in wis. The thing gets half way in and bottoms. When I pull it out its nicely covered in trans fluid so I know something is right.

So what part number should I have?

Also does anyone want to buy a basically new trans dipstick used for exactly 3 seconds.

leeer73

it's actually more like a measuring tool instead of a dipstick and it is not meant to go all the way in. you are supposed to insert it untill it stops and there will still be some that did not go in yet. And then you just pull it back out and measure. Atleast that's how it is on my '05 C230.

pcy

^ +1.

make sure you are measuring at the right temp mark on the measuring tool.

zerocover

That would mean my tranny is way way over filled. Like the fluid goes up another 3 inches on the metal part. (that would also explain why its acting up)

Glyn M Ruck

Yes! This is not a conventional dipstick. You must bottom it & then take the reading.

samaritrey

not to be the one but are you sure you used the right hole?

leeer73

Just drain it from the pan. theres a hex bolt on the pan (driver side), get an oil change box and drain it. Then Measure how much came out and start by refilling like half of that amount (or less) and measure again.

If you had the right amount of trans fluid in it, and you had the front of your car on ramps, you would drain about 2.75 - 3 liters out. Depending on how long you let it drain.

Make sure the engine is on and make sure the fluid is the right temp. It is very hard to know what the right temp is without a temp gun, but I just start my car and let it idle for about 15-0 mins and measure then. It seems to have worked well for me thus far.

zerocover

I always use the right hole.

In this case its the one by the throttle body, it looks like when the dealer replaced my trans harness plug they way overfilled the transmission. THe fluid was nice and red it didn't look burnt or used up.

fookoo303

are you measuring it with the engine on or off?

leeer73

When the engine is off, the fluid reads lower, that is a common reason for over filling. People dont realize that the engine should be running and when they check it with the engine off and it reads low (even though its is the corrct amount of fluid), they end up adding more fluid to reach the fill line. Then when you check it with the engine running, it's that much above the fill line.

splinter

^ It’s probably my language barrier, but this information is entirely incorrect. :)

The torque converter, valve body and cooling circuits are filled only when the engine is running,
thus MB's workshop procedure to ascertain proper ATF level in an "as driven" (running) mode.

leeer73

Lol, could be...Let me sober up and re-read it in the morning!

fookoo303

This is exactly why i asked. I'm wondering if the OP measured correctly.

splinter

Duly noted before posting. ;)

zerocover

Just a little update. I've just finished the trans flush and everything went great. Shifts are now smooth and just as fast as ever, its like driving a new car.

I'd like to thank the members of the forum, this place is truly an invaluable resource.