Manual transmission stiff - Mercedes Benz SLK Forum

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#1 Old 01-18-2018
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Manual transmission stiff

Anyone got the 6 speed manual transmission? Mines very stiff moving up from 1st to 2nd, and down from 3rd to 2nd.

Have read changing gearbox oil might help? Going to be about Ł60 to do that at the local MB indy, thought i'd check before potentially throwing money in the wrong direction
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#2 Old 01-18-2018
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Mine is a little balky when cold but very good once warmed up a bit. Have you checked the oil level ?
1. Raise and support the vehicle.
2. Remove the transmission fill plug.
3. The full fluid level should be at the base of the fill plug threaded hole. If the fluid is low, check for visible transmission fluid leaks and top off the fluid level.
4. Install and tighten the fill plug (1) to 50 N·m (37 ft.lbs.).
5. Lower the vehicle.
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#3 Old 01-18-2018
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#4 Old 01-18-2018
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I found a change to redline MTL helped. IIRC Mercedes recommend a reduced fill volume of 1.2L rather than 1.5L to help with this.
I also found bleeding the clutch helps.
Mark
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Last edited by Mark999; 01-18-2018 at 12:46 PM. Reason: Update
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#5 Old 01-18-2018
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I short filled mine with redline , when I had a 230 6 speed , and to be completely honest it didn't make a great deal of difference .
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#6 Old 01-18-2018
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You’re not alone with a second gear problem. Mine is very crunchy 1-2 though 3-2 is ok. I changed the oil for Fuchs Titan fully synth. Every gear change was improved but 1-2 still crunchy unless you ‘ease’ it in. Unless I’m on a hill I usually start in 2. This avoids the issue for me.
I think MB manual boxes are a punishment for not buying an auto!
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#7 Old 01-18-2018
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Originally Posted by neileg View Post
You’re not alone with a second gear problem. Mine is very crunchy 1-2 though 3-2 is ok. I changed the oil for Fuchs Titan fully synth. Every gear change was improved but 1-2 still crunchy unless you ‘ease’ it in. Unless I’m on a hill I usually start in 2. This avoids the issue for me.
I think MB manual boxes are a punishment for not buying an auto!
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Did you try the fix in post 3?

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#8 Old 01-19-2018
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Did you try the fix in post 3?


Yes Myk. My mechanic measured the oil drained out and that was 1.2l too
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Last edited by Avel Du; 01-20-2018 at 10:29 AM.
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#9 Old 01-23-2018
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Originally Posted by rossiniere.vaud View Post

Thanks for this. Is this something sent out from MB head office to dealers? I had read about the 300ml reduction 'unofficially', but this is the first I've seen of some sort of official documentation.

I will look into what the current oil level is. Could well have been done already as the previous owner always had the MB dealership look after it.
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#10 Old 01-23-2018
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Quote:
Originally Posted by oldmanhouse View Post
Thanks for this. Is this something sent out from MB head office to dealers? I had read about the 300ml reduction 'unofficially', but this is the first I've seen of some sort of official documentation.

I will look into what the current oil level is. Could well have been done already as the previous owner always had the MB dealership look after it.
That looks like a screengrab from the Mercedes-Benz WIS (Workshop Information System)... available to UK MB-Club members, along with access to EPC (Electronic parts catalogue) - also available elsewhere in the world, but different commercial arrangements may apply.
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#11 Old 01-23-2018
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Note: original poster has a 230 and probably needs first. Since I have a 3.2 I usually start in second (2.62:1). For me first gear has few uses:
- going up the side of a wall
- in malls or parades
- stating on a hill
- being antisocial (however a really fast 1-2 near redline is ga-run-teed to trigger the traction control even on a Florida shell road (fractal). OTOH I consider the TC to be essential when it rains.
- teaching someone how to use a clutch (almost impossible to stall).


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#12 Old 01-23-2018
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I’ve got a 200k and 1st isn’t very useful.
One possible use you missed out is checking that the traction control is working
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#13 Old 01-23-2018
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On my previous car everyone used RedLine also and it is quite good. One of the guys had tried Neo RHD and liked it well, so I tried it also. It is really great stuff, much better than even the RedLine. If you are going to change fluid, I would use that. It isn't cheap, but much cheaper than a trans. The real issue is probably that your synchronizers in your trans are worn.
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