Late and hard shifting W108 - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 07-03-2016, 03:33 PM Thread Starter
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Date registered: Oct 2012
Vehicle: 1968 250S, 1991 300se, 1998 SL500, 2x 1977 450SEL 6.9. Past MB's; 300SD, 300E, 300TE, 190E, ML420
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Late and hard shifting W108

My 250S is getting harder (as in taking longer to do) when on the highway I hard accelerate up to around 50mph it seems hesitant to make the final shift seamlessly. I have to let off the throttle a little bit to get it to make the final shift.

Also the shifts seem harsher than they should be, they are real strong snappers.

Around town shifts fine, though the shifts are pretty strong.

Trans was rebuilt @40K miles and 20 years ago and has worked just fine always. Fluid changed not that long ago.

Any ideas on adjustments or things to look for?
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post #2 of 4 (permalink) Old 07-05-2016, 02:00 PM
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Vehicle: 1968 280se, 1972 280se 4.5, Land Rover disco II, Triumph Thruxton, Triumph Tiger. +boring Chevy Van
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Originally Posted by rumb View Post
My 250S is getting harder (as in taking longer to do) when on the highway I hard accelerate up to around 50mph it seems hesitant to make the final shift seamlessly. I have to let off the throttle a little bit to get it to make the final shift.

Also the shifts seem harsher than they should be, they are real strong snappers.

Around town shifts fine, though the shifts are pretty strong.

Trans was rebuilt @40K miles and 20 years ago and has worked just fine always. Fluid changed not that long ago.

Any ideas on adjustments or things to look for?
Hi Rumb
My 280se was doing the same thing. Really hard shifting. I unscrewed the small screw on the modulator approx. 1/2 turn out, it made a significant improvement. You have to remove the heat shield then loosen a small locking nut 10mm. Then I turned the small screw counterclockwise for softer shifts clockwise for harder shifts.Still not as smooth as my 4.5 but much better.
Cheers John.
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post #3 of 4 (permalink) Old 07-16-2016, 12:54 PM Thread Starter
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Date registered: Oct 2012
Vehicle: 1968 250S, 1991 300se, 1998 SL500, 2x 1977 450SEL 6.9. Past MB's; 300SD, 300E, 300TE, 190E, ML420
Location: Colorado
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Garage
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I found my fluid level was too high, removed enough to be just below the HOT mark and it shifts better now. 3-4 is much smoother and 2-3 is a bit better.

I may still do the adjustment sometime. The little screw on mine has wire on it to keep it from turning out.
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post #4 of 4 (permalink) Old 08-13-2016, 11:58 AM Thread Starter
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Date registered: Oct 2012
Vehicle: 1968 250S, 1991 300se, 1998 SL500, 2x 1977 450SEL 6.9. Past MB's; 300SD, 300E, 300TE, 190E, ML420
Location: Colorado
Posts: 2,352
Mentioned: 6 Post(s)
Quoted: 425 Post(s)
Garage
(Thread Starter)
Update, I finally adjusted the screw out 1/4 turn and the shifts are smoother now. Will drive for a while to see how I like it, I may try another 1/8th turn later.

Unrelated, I also got rid of the air in my power steering, I loosen the supply line on the top of the gear box and bled out about a cup of fluid. No more annoying squeal noises at low speeds!
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