Transmission flaring help - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 08-01-2013, 08:59 AM Thread Starter
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Exclamation Transmission flaring help

I just purchased a 1975 300d a few weeks ago and I am looking into how to fix the transmission. It seems like it takes way too long for the car to get between first and second gear. It seems like the engine has to go into overdrive almost before the car will shift. I have read on here that there is a way to fix this via the "bowden cable". I have a great mechanic, but I am not sure if he is familiar with this or not. Can anyone tell me what I should say to him exactly about correcting this?

The rest of the gears shift a little hard, but really not bad. The only thing that is bothersome is hearing the engine revving so hard before it shifts up into second.

Thanks for your help!
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post #2 of 10 (permalink) Old 08-01-2013, 09:36 AM
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Sounds like your transmission is delaying upshifts, not flaring. When a transmission flares, it briefly "freewheels" as it shifts.

Also, I believe you have a W115, not a W123 chassis. IIRC, the transmission gauges throttle position through a series of actuating rods , not a bowden cable. Check the passenger side of your engine for a linkage leading to the transmission.

Someone may have adjusted (shortened) the actuator rod to eliminate flare, which would delay the upshift.
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post #3 of 10 (permalink) Old 08-01-2013, 10:46 AM Thread Starter
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Thanks for the reply. The car is at the mechanics now as I am having a new water pump installed. I will have to ask him about the rod. I was not aware that the w115 tranny wasnt controlled by a bowden cable.
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post #4 of 10 (permalink) Old 08-02-2013, 02:57 AM
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It indeed has a rod which must be adjusted according to specs, because it not only controls the shift points, but also the modulating pressure inside the transmission.

Best check and lubricate the entire linkage.
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post #5 of 10 (permalink) Old 08-05-2013, 10:06 PM
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Likely someone shortened the transmission rod length. Increase in length will shift gears earlier and softer.
Also check you have the correct Dexron 2/3 type fluid in the transmission .
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post #6 of 10 (permalink) Old 08-06-2013, 12:55 PM
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Make sure all the linkage rods are set but the FSM lengths...also confirm the kick down switch behind the accelerator isn't stuck. My transmission is the same as yours. Just by adjust the rod going to the injection pump my shifts became smoother and earlier. This link has the PDF for the rod lengths....chose model 115 with 617 engine and type mw pump. I do not know what the factory length of the Bowden rod should be....if anyone knows, I would also like to know..

30 Accelerator Control - OM617
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post #7 of 10 (permalink) Old 08-09-2013, 07:31 PM Thread Starter
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So I located the rods, is the one to be lengthened the one running vertically that come out near the top of the engine? Or is it one of the two rods that are connected to the transmission that are lower and run parallel to the floor?
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post #8 of 10 (permalink) Old 08-10-2013, 03:37 AM
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The two rods at the underside are the oil cooler lines. The rod at the top of the engine is the control rod for the transmission. It should move too when you move the linkage by hand.
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post #9 of 10 (permalink) Old 08-13-2013, 11:59 AM Thread Starter
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And is lengthening the control rod something that most any mechanic can do if I ask them to?
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post #10 of 10 (permalink) Old 08-13-2013, 12:47 PM
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Quote:
Originally Posted by Johnny300 View Post
And is lengthening the control rod something that most any mechanic can do if I ask them to?
Go to the link I provided....go to the first box, scroll to w115 617 with mw pump....print out the PDF and give it to the mechanic...
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