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Poster Thread
btusulu
Posted on: 2017/6/19 4:47
Not too shy to talk
Joined: 2017/5/18
From: sarawak
Posts: 26
Benz Model: W210, W211
Message:
Re: w211 Diesels
Chong,

I just solved the mystery on one of my w211 e270 where the transmission wasn't transferring the engine torque adequately to the rear wheels (when compared to the other unit).

before:
-the engine rpm barely drops after every shift of gear
-the engine rev will drop all the way to idle as soon as i release the gas pedal while driving
-the vehicle will gradually slow down while the engine rpm stays the same when going up a hill at moderate gas pedal pressure
-vehicle feels sluggish (slow picking up)
-vehicle feels 'light' when coasting (without stepping on the gas pedal)
-however, rear wheels can easily spin (trigger esp action) in the rain even when the car is on the move if i give it moderate gas pedal pressure. i concluded there is no excessive slippage within the gearbox

I had qualified workshop checked out the car and even let them drove the other w211 e270. they confirmed one car is acting 'abnormally' compared to the other. however, they cannot pin point what exactly is causing it to behave like that as:
-the gearbox can shift with no problem
-the condition does not seems to worsen over the past 1.5 years
-no difference after fluid and filter change
-no error message from transmission control unit

i took it as a challenge: checked the solenoids, replaced all the solenoid o-rings, replaced the conductor plate but still the same. finally, i opened up the valve body and discovered a tiny plastic ball (mb calls it shuttle ball) hiding underneath the torque convertor lockup solenoid inlet. logically, this tiny ball is blocking the atf flow. I couldn't find any information (based on several 722.6 service details) to support the 'existence' of that tiny ball at that location so i removed it. The remaining 8 steel balls & 4 shuttle balls were intact. put everything back carefully and it was like magic.

after:
-the engine rpm will drop noticeably after every shift of gear
-the vehicle can maintain speed better
-vehicle will go through each of the gears and accelerate briskly (dangerously if you drive in an irresponsible manner)
-slightly better fuel efficiency

I tend to believe that tiny ball was added to artificially prevent the torque convertor lockup clutch to operate. The drivers of my car happen to hate the 'slip' feeling. I will not speculate on how that shuttle ball got there.

To all who may be experiencing this sort of condition, this is something worth checking before we go crazy and replace or rebuild the gearbox.

btusulu
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Subject Poster Date
   w211 Diesels Chongsh2838 2017/5/8 0:10
     Re: w211 Diesels Michaelgbcmel 2017/5/16 4:11
     Re: w211 Diesels btusulu 2017/5/23 3:19
       Re: w211 Diesels Chongsh2838 2017/6/9 14:18
         Re: w211 Diesels btusulu 2017/6/15 1:57
           Re: w211 Diesels Chongsh2838 2017/6/17 1:53
           » Re: w211 Diesels btusulu 2017/6/19 4:47
               Re: w211 Diesels Chongsh2838 2017/6/21 23:25
                 Re: w211 Diesels btusulu 2017/6/30 4:52
               Re: w211 Diesels ericlks 2017/9/4 17:29
                 Re: w211 Diesels btusulu 2017/9/5 1:45
     Re: w211 Diesels Chongsh2838 2017/6/30 12:50
       Re: w211 Diesels btusulu 2017/7/3 3:30
     Re: w211 Diesels nizam9w2ms 2018/1/2 20:46
       Re: w211 Diesels Chongsh2838 2018/1/17 18:28
         Re: w211 Diesels nizam9w2ms 2018/1/20 1:55
       Re: w211 Diesels btusulu 2018/2/22 11:46
         Re: w211 Diesels nizam9w2ms 2018/3/13 11:53
           Re: w211 Diesels mdameer 2018/8/19 12:58
             Re: w211 Diesels Mabel 2018/9/29 23:54

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