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Trying to do a transmission flush on my 2004, 722.901, build date 12/03. Finding lots of conflicting info.
Can someone tell me if these 2 black covers are where you check for the torque converter drain plug?
If so, how do you get them off without breaking them?
Is the transmission line I'm pointing to in the pic a transmission fluid in or out line? There is one on the other side
of the transmission also.
Last edited by marko69; Mar 31, 2018 at 10:19 PM.
Reason: repost pic
Yes, if you have a TC drain, you find it by removing the rear black plastic cover and then rotating the engine (manually, using a socket wrench on the crank pulley nut) until you find it. It's doubtful that you have the drain, though, since your's is such an early model. Those covers used to be pliable enough to remove, but they get brittle and can break.
The outbound cooling line is the one that comes out of the left side (USA driver side) of the transmission.
R230, C5 Corvette Convertible, Audi Allroad, Lexus RX350, AE86 Hachi Roku
Marko, I relate to your situation.
I have a very early run 04 500. My car didn’t have a TQ drain plug. I changed the fluid twice in <15k mi. Last time I changed the fluids I used the cooler lines and replaced > 6L, then I dropped the pan replaced the filter and refilled the trans as per service at temp requires. Bought the car with no prior service history and had 70k mi
After another 12k mi. I had trouble with it not shifting. Not at all related to fluids but heat and general substandard design of electronic connectors and heat soaked plastic based wire ribbon connecting the servos on the TC plate.
Only afterwards having the already aged servo connections let go. Not the end.
I had to have the entire valve body replaced and coded to the car. I own an SDS and was stumped at why I couldn’t move beyond a TCU re&re. Well; after calling MB area service rep, turns out in MB infinite wisdom (and very likely a lot of trans warranty costs) they demand the entire valve body and TCU be replaced on early run 7G r230’s. It now sports a revised and updated valve body/TCU and I have a spare valve body and TCU leftover.
My situation is unique to early run 04’s. Hopefully later years won’t have this valve body TCU issue as well as the TQ drain plug
Moral of the story is; yes proper fluids and levels are necessary but aging plastic in a heated trans and plastic circuit ribbon should have been built better and nothing related to fluids will prevent these all too common 7G failures.
Good Luck
Hary
Last edited by Hary Gahtoe; Apr 2, 2018 at 12:17 PM.
2011 SL550, other than mb Tran fluid, what other brands/types are acceptable for tranny fluid and filter change? I’m going to have an Indy do the job, but I just wanted to know what fluid I should ask for. I am at 38k and fluid has never been changed, manual says to do it at 40k, but doesn’t list any specs for fluid
Yes, if you have a TC drain, you find it by removing the rear black plastic cover and then rotating the engine (manually, using a socket wrench on the crank pulley nut) until you find it. It's doubtful that you have the drain, though, since your's is such an early model. Those covers used to be pliable enough to remove, but they get brittle and can break.
The outbound cooling line is the one that comes out of the left side (USA driver side) of the transmission.
Do you happen to know that part number for the cover
thanks, your post had far more info than I need. I’m only trying to find out the brands/types of Tran fluid I should be asking the Indy to use, or make sure he’s using correct fluid. I’m not going to buy the fluid myself. Haven’t used this Indy before so just want to make sure of what he puts in my 2011 sl550
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