300E overfilled transmission - PeachParts Mercedes-Benz Forum

JordaanDMC-12 · #1 11-25-2009, 08:19 PM

The trani on the 300E is starting to slip so I checked the fluid thinking it might be low and it's overfilled

How do I drain the excess fluid? Through the dipstick housing or from below?

79Mercy · #2 11-25-2009, 08:23 PM

Are you sure you checked it correctly.

Engine HOT, park on level ground, cycle through each gear, and then place in N, and check fluid.

Did this happen all of a sudden?

JordaanDMC-12 · #3 11-25-2009, 08:34 PM

Quote:

Originally Posted by 79Mercy

Are you sure you checked it correctly.

Engine HOT, park on level ground, cycle through each gear, and then place in N, and check fluid.

Did this happen all of a sudden?

I did it with the engine hot, on ground level and did cycle through each gear but placed it back in park. Should I test it again in neutral?

79Mercy · #4 11-25-2009, 09:08 PM

yes check it in N

JordaanDMC-12 · #5 11-25-2009, 09:15 PM

ok will do thanks!

pawoSD · #6 11-25-2009, 09:53 PM

Why would neutral or park make any difference? Park is just neutral with the parking prawl engaged.

I've never heard this before.

Also, the owners manual says to check it in Park.

79Mercy · #7 11-25-2009, 09:58 PM

When I check it in P it is always higher than when i check it in N for some reason, the stick also has lot of bubles on the stick making it hard to read the level when i check it in P.

I have always heard to check it in N.

tinypanzer · #8 11-25-2009, 10:37 PM

I've always checked my cars in park, just cause I don't like standing in front of a running car to begin with, never mind without the park pawl and parking brake firmly engaged.

Nothing is more terrifying than being outside your car when it starts to move, and you are the driver.

If your tranny is really overfilled, you can either slip a thin (think fishtank air) hose down the dipstick tube and pump/siphon some out, or I suppose you could pop off the tranny cooler line where it goes into the radiator.

79Mercy · #9 11-25-2009, 10:39 PM

well then i guess it makes no difference, i just always do it in N with the parking brake set.

pawoSD · #10 11-25-2009, 10:50 PM

Quote:

Originally Posted by tinypanzer

I've always checked my cars in park, just cause I don't like standing in front of a running car to begin with, never mind without the park pawl and parking brake firmly engaged.

Nothing is more terrifying than being outside your car when it starts to move, and you are the driver.

If your tranny is really overfilled, you can either slip a thin (think fishtank air) hose down the dipstick tube and pump/siphon some out, or I suppose you could pop off the tranny cooler line where it goes into the radiator.

Even if the car were to go into drive at idle....it would not move at more than 3-4mph.....its not that scary.

JordaanDMC-12 · #11 11-26-2009, 12:42 AM

Well in both Park and Neutral it's still reading above the max line -_- What is recommended for draining the excess fluid?

ps2cho · #12 11-26-2009, 12:55 AM

Quote:

Originally Posted by JordaanDMC-12

Well in both Park and Neutral it's still reading above the max line -_- What is recommended for draining the excess fluid?

Best way would be to drain some from the pan. When was the last time the filter + fluid was changed? Might be a good excuse to do it...

JordaanDMC-12 · #13 11-26-2009, 06:12 PM

Quote:

Originally Posted by ps2cho

Best way would be to drain some from the pan. When was the last time the filter + fluid was changed? Might be a good excuse to do it...

Actually, was looking through the paperwork and the trani was serviced in June, I just hope the trani is not on its way out. It takes awhile to shift and you have to feather it sometimes to make it shift.

Thanks, I'll hopefully drain some fluid today! woot

ps2cho · #14 11-26-2009, 10:14 PM

Quote:

Originally Posted by JordaanDMC-12

Actually, was looking through the paperwork and the trani was serviced in June, I just hope the trani is not on its way out. It takes awhile to shift and you have to feather it sometimes to make it shift.

Thanks, I'll hopefully drain some fluid today! woot

Well deal with the overfilled problem first then go from there. If its still acting funny it might just be a linkage/modulator issue. Steve Brotherton has a great article on this.

workerunit · #15 11-26-2009, 11:42 PM

Quote:

Originally Posted by pawoSD

Even if the car were to go into drive at idle....it would not move at more than 3-4mph.....its not that scary.

Not only is it scary, it is dangerous as hell, if you are standing right in front with your body touching the car and it moves forward at 3-4 mph, you can very well be run over by your own car, or crushed between the car and another object [car,wall,pole,etc]

You will likely only be run over by a car once in your life, keep parking brakes engaged and automatic transmissions in Park when working on a vehicle with it's engine running. Bad things do happen, don't temp Murphy.......