First gear whine - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 11-11-2008, 04:01 AM Thread Starter
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First gear whine

Hi folks,

Is there any way to get the first gear in my 4 speed manual transmission to be quieter - it sounds like a straight cut gear

This is from a W126 with an M110. I changed the oil (ATF+additive) to no avail

I thought of using regular transmission oil but MBZ does not recommend it - there must be a reason right ?

Any help would be appreciated.

Denis
Lion sur Mer
France
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post #2 of 5 (permalink) Old 11-25-2008, 09:45 AM
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Did you just buy the car or did the sound appear all of the sudden?

1977 - W116 - 6.9
1974 - W115 - 240D /8 - 4(M) OM617.910 + Turbo + 300D FW - Completed 7/8/10
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post #3 of 5 (permalink) Old 11-27-2008, 02:21 AM Thread Starter
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First gear whine

Hi

It's been like that ever since I bought it a year ago. I did a fluid change to the proper ATF and it has improved a bit. Both the diff and the manual gearbox emit acceptable noise levels on the highway in 2nd ,3rd and 4th gear but first is a "whiner" that sounds a bit like straight cut gear (even though it is not a straight cut gear).

I thought of mixing the ATF with high grade 75-90 gearbox oil. Any thoughts on doing this ?

Denis
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post #4 of 5 (permalink) Old 11-27-2008, 02:31 AM
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You have a worn bearing in the "cluster" gears. A 50/50 mix of 90 and ATF will not cure the noise but will cut it down a bit and allow the transmission to last a little longer. It's on it's way out I'm afraid and has probably been damaged by abuse by a previous owner. They normally silent in any gear. Thats an unusual combination though,I have owned w114's and And W123's with the m110 and manual transmission but i have never thought any one would order a W126 with manual.
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post #5 of 5 (permalink) Old 11-27-2008, 03:00 AM Thread Starter
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W126 with manual

Hi

A W126 with a manual gearbox and M110 engine is a very common configuration outside America. I only wish it were a 5 speed.

In France, people simply don't like automatic transmissions...probably because they were power eaters and increase fuel consumption many years ago. Their reputation is quite tarnished

Thanks for he insight !


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