Sad Tranny...seeking guidance - Mercedes-Benz Forum
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post #1 of 16 (permalink) Old 04-14-2019, 06:47 PM Thread Starter
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Question Sad Tranny...seeking guidance

My transmission has been flaring for a while (2-3 months) going from 2nd to 3rd gear. Back in 2016 the same transmission was slipping and overheating. Back then in 2016 I did a fluid change (nasty dark fluid and a good bit of debris in the pan), replaced the filter and added a bottle of Lucas, it seems to function normally until recently.

Last week after a lot of stop and go traffic the transmission began slipping again, in addition to the flaring. Fluid levels are fine. No leaks. Color of the fluid looks ok on the rag when I check fluid levels.

I am planning to replace the K1 Accumulator Spring, modulator, a put in new filter, gasket and fluid to see if that fixes it. I should be able to do all that for around $100.

I did drain the bell housing last time and pump out as much fluid as I could from above through the dipstick hole. Does it make sense to have the transmission flushed instead of just a fluid change? Is there more debris and gunk still in the tranny that is better extracted through a flush? Is it bad to use lucas again in the same transmission?

Or based on the previous tranny issues, should I just bite the bullet and order a rebuilt tranny from Sun Valley?

Is there anything else obvious that I am missing?
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post #2 of 16 (permalink) Old 04-14-2019, 07:24 PM
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Originally Posted by ehawk01 View Post
My transmission has been flaring for a while (2-3 months) going from 2nd to 3rd gear. Back in 2016 the same transmission was slipping and overheating. Back then in 2016 I did a fluid change (nasty dark fluid and a good bit of debris in the pan), replaced the filter and added a bottle of Lucas, it seems to function normally until recently.

Last week after a lot of stop and go traffic the transmission began slipping again, in addition to the flaring. Fluid levels are fine. No leaks. Color of the fluid looks ok on the rag when I check fluid levels.

I am planning to replace the K1 Accumulator Spring, modulator, a put in new filter, gasket and fluid to see if that fixes it. I should be able to do all that for around $100.

I did drain the bell housing last time and pump out as much fluid as I could from above through the dipstick hole. Does it make sense to have the transmission flushed instead of just a fluid change? Is there more debris and gunk still in the tranny that is better extracted through a flush? Is it bad to use lucas again in the same transmission?

Or based on the previous tranny issues, should I just bite the bullet and order a rebuilt tranny from Sun Valley?

Is there anything else obvious that I am missing?
Did you check your throttle cable adjustment. Sounds like its too late now.
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post #3 of 16 (permalink) Old 04-14-2019, 07:26 PM Thread Starter
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I did adjust it when replacing the injectors a while back. Could that be contributing to this problem?
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post #4 of 16 (permalink) Old 04-14-2019, 07:38 PM
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I did adjust it when replacing the injectors a while back. Could that be contributing to this problem?
Throttle cable controls transmission fluid pressure. Gives it higher pressure for higher loads. Could have contributed to the problem if the pressure has been too low for a period of time.
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post #5 of 16 (permalink) Old 04-14-2019, 07:49 PM Thread Starter
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Should I increase tension or lessen tension to improve pressure?
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post #6 of 16 (permalink) Old 04-15-2019, 05:40 PM
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Should I increase tension or lessen tension to improve pressure?
Which ever direction the cable moves when the throttle goes to full, make it go more that way, but keep it in range. Best find the adjustment procedure in the manual and see where you are before you start.
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post #7 of 16 (permalink) Old 04-17-2019, 01:57 PM Thread Starter
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Red face So Far So Good....

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Which ever direction the cable moves when the throttle goes to full, make it go more that way, but keep it in range. Best find the adjustment procedure in the manual and see where you are before you start.
After adjusting the bowden cable, the flaring is gone. I think I may have over adjusted though, as shifting seems delayed. I will adjust again this evening to see if I can improve the shifting without recreating the flaring.

I will need to take a long drive to see if the slipping returns.
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post #8 of 16 (permalink) Old 04-17-2019, 05:14 PM Thread Starter
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Thumbs down Not so fast....

Quote:
Originally Posted by ehawk01 View Post
After adjusting the bowden cable, the flaring is gone. I think I may have over adjusted though, as shifting seems delayed. I will adjust again this evening to see if I can improve the shifting without recreating the flaring.

I will need to take a long drive to see if the slipping returns.
I took the SL for a drive this evening and it seemed initially that the bowden cable adjustment had fixed things. I jumped on the interstate for about 5-10 mins and then I noticed a loss in power (and I think slipping of the tranny). I got off and back on the streets and the loss of power led to a stall. I was able to restart the car and then things ran fine for another few minutes before another stall. I was able to get back home by driving real nice and easy.

Clogged tranny filter maybe? I have not swapped fluid yet.
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post #9 of 16 (permalink) Old 04-17-2019, 05:30 PM
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Originally Posted by ehawk01 View Post
I took the SL for a drive this evening and it seemed initially that the bowden cable adjustment had fixed things. I jumped on the interstate for about 5-10 mins and then I noticed a loss in power (and I think slipping of the tranny). I got off and back on the streets and the loss of power led to a stall. I was able to restart the car and then things ran fine for another few minutes before another stall. I was able to get back home by driving real nice and easy.

Clogged tranny filter maybe? I have not swapped fluid yet.
Doesn't hurt to try.
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post #10 of 16 (permalink) Old 04-18-2019, 09:19 PM
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Don't know if this will help or not, but I think it is worth a try. About two years ago the line busted from the transmission to the radiator on my car, and I drove it about five miles to my house. I had the line replaced but the transmission would not shift after servicing it. I put a can of Seafoam in it and started running it. After about two days it started shifting normally, and has been performing well ever since.
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