Check trans fluid while running? - Mercedes-Benz Forum

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post #1 of 12 (permalink) Old 01-16-2010, 01:07 PM Thread Starter
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Check trans fluid while running?

Do you check transmission fluid level with car running or not? Running is what I have done on other cars. I am having the sluggish reverse when hot. When I got the car one month ago a major selling point was rebuilt trans for you guessed it, sluggish reverse.

Want to start with the fluid and I have already contacted the dealer and guy who rebuilt trans to get them to stand behind whatever this turns out to be.

As a side, I got the car warm, drove a bit too warm up trasnmission and while running fluid is not even at bottom cold mark. It is nice and new fluid at least.

Found it, check well running, I am definitly low then. When cold car hits reverse fine, usual symptom from thread I have read. I will try fluid first and go from there.

Last edited by 500SL4Me; 01-16-2010 at 01:27 PM.
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post #2 of 12 (permalink) Old 01-16-2010, 02:03 PM
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do it when it's hot, don't overfill it.

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post #3 of 12 (permalink) Old 01-16-2010, 02:44 PM Thread Starter
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I just did, drove around for a long while, it took a quart and I am still not sure it is full. I am not hitting between the final two marks at the 180F marks. I find it hard to believe that the mechannics who R&R'd the transmission could have underfilled this much and I am indeed not wanting to overfill.

It seems to have helped a bit but hard to say. Incidently I can go up steep incline in reverse no problem but does take a bit of rev before it really engages.

What is the capacity of this bad boy?

If the rebuilder and dealer does not come through (as is no warranty mentality) I will live with it I guess. We shall see. I will check it tomorrow when cold, and have some long driving to do and then check when hot again to be sure. Then I will drive the car off a pier into Lake Michigan ;-)

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post #4 of 12 (permalink) Old 01-16-2010, 03:48 PM
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there are two lines, one cold, one hot, as the fluid expands.

i don't follow the relationship of dealer and guy who did the tranny and the selling point, was it sold "as is" or an implied or written warranty for tranny work?

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post #5 of 12 (permalink) Old 01-16-2010, 03:56 PM Thread Starter
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I got the car one month ago and the dealer I bought it from had the tranny rebuilt due to reverse issue. I have the $1,500 invoice, it was actually a ncie selling point for me. The trans rebuilder says no warranty but the dealer is trying to get them in line. We shall see. I spoke directly to the trans rebuilder and he said bring it by it may just need some adjustment. He's not exactly close and I will try to get their next weekend. Thankfully this is not a daily driver.

Yes, I am aware of the cold and hot range on the dipstick and will check again tomorrow. I checked today after I put the quart in (I actually added little by little) with driving in between.
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post #6 of 12 (permalink) Old 01-16-2010, 04:02 PM
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you don't need to drive it in between adding fluid. make sure it's a flat surface and keep keep adding a little until it's where it should be.

if the the rebuilder doesn't stand behind the work the dealer should. take in to mbusa if you have to.

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post #7 of 12 (permalink) Old 01-16-2010, 05:10 PM Thread Starter
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Not an MB dealer unfortunately, just your basic ole' used car joint. I am gonna go pour a drink and think positively for the weekend. Nothing else I can do right now.
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post #8 of 12 (permalink) Old 01-16-2010, 08:24 PM
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that's why it's recommended to get a ppi before making a purchase, to see what good/bad you're dealing with.

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post #9 of 12 (permalink) Old 01-16-2010, 10:21 PM
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I check mine when the engine is running. Once at 25 degree and once at 80 degree (C). I bought the laser gun and pointed at the pan to measure the temperature. This is for the 722.6 tranny though.
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post #10 of 12 (permalink) Old 01-17-2010, 05:41 AM Thread Starter
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Quote:
Originally Posted by bearone2 View Post
that's why it's recommended to get a ppi before making a purchase, to see what good/bad you're dealing with.
Can I borrow your time machine In hindsight I could have found a better car for the money, but such is life. She is mine now and I will get her sorted if it kills me and my bank account.

Best case, they come through for me, not so best case I drive it for years with a slow reverse, worst case, someday I order up a rebuilt trans for $1,500 and have my indy put in one day.

Last edited by 500SL4Me; 01-17-2010 at 07:49 AM.
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