Engine mounts and transmission problem
Thread Starter
Newbie
Joined: Apr 2024
Posts: 7
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c klasse
Engine mounts and transmission problem
Howdy,
because of the noisy sound during the cold start of my car, I have recently replaced the engine mounts and the transmission mount on my W204 CGI 180....after replace them, the noise was complete gone (which was quite nice xD)
HOWEVER after the replacement I noticed that the gear shifting become NOT smooth anymore when the car switching from 1-2 or 2-3 gear (generally the problem appears under 35km/h, over 35 the switch is quite smooth imo). Does anyone had the same issue or an idea what might caused it? Can the engine mount be the cause? I tried lemförder and another brand, both the same effect...-.-
Thank you very much in advance!!!
because of the noisy sound during the cold start of my car, I have recently replaced the engine mounts and the transmission mount on my W204 CGI 180....after replace them, the noise was complete gone (which was quite nice xD)
HOWEVER after the replacement I noticed that the gear shifting become NOT smooth anymore when the car switching from 1-2 or 2-3 gear (generally the problem appears under 35km/h, over 35 the switch is quite smooth imo). Does anyone had the same issue or an idea what might caused it? Can the engine mount be the cause? I tried lemförder and another brand, both the same effect...-.-
Thank you very much in advance!!!
Last edited by Genger; Apr 1, 2024 at 03:15 PM. Reason: edit
Super Member
Joined: Jun 2016
Posts: 562
Likes: 75
Mercedes w204 4matic sport
Howdy,
because of the noisy sound during the cold start of my car, I have recently replaced the engine mounts and the transmission mount on my W204 CGI 180....after replace them, the noise was complete gone (which was quite nice xD)
HOWEVER after the replacement I noticed that the gear shifting become NOT smooth anymore when the car switching from 1-2 or 2-3 gear (generally the problem appears under 35km/h, over 35 the switch is quite smooth imo). Does anyone had the same issue or an idea what might caused it? Can the engine mount be the cause? I tried lemförder and another brand, both the same effect...-.-
Thank you very much in advance!!!
because of the noisy sound during the cold start of my car, I have recently replaced the engine mounts and the transmission mount on my W204 CGI 180....after replace them, the noise was complete gone (which was quite nice xD)
HOWEVER after the replacement I noticed that the gear shifting become NOT smooth anymore when the car switching from 1-2 or 2-3 gear (generally the problem appears under 35km/h, over 35 the switch is quite smooth imo). Does anyone had the same issue or an idea what might caused it? Can the engine mount be the cause? I tried lemförder and another brand, both the same effect...-.-
Thank you very much in advance!!!
Super Member
Joined: Jun 2016
Posts: 562
Likes: 75
Mercedes w204 4matic sport
I suspect something was left loose doing the job, it’s easy to happen by accident. Since the issue wasn’t there before I’d be looking into that. To check the engine mounts you can do what’s called a power brake. Have someone watching the engine (not right in front,just in case), press on the brake real good and put in gear. Then hit the gas(rev it) quick (like to 2k) and see if the engine jumps, if it does you have a loose mount. Then do it in reverse. Loose mounts can definitely cause this.
Thread Starter
Newbie
Joined: Apr 2024
Posts: 7
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c klasse
I suspect something was left loose doing the job, it’s easy to happen by accident. Since the issue wasn’t there before I’d be looking into that. To check the engine mounts you can do what’s called a power brake. Have someone watching the engine (not right in front,just in case), press on the brake real good and put in gear. Then hit the gas(rev it) quick (like to 2k) and see if the engine jumps, if it does you have a loose mount. Then do it in reverse. Loose mounts can definitely cause this.
Senior Member
Joined: Jun 2016
Posts: 462
Likes: 152
From: Panama City, FL
2020 C300, 2013 C250, 2000 Boxster S
The engine mounts are basically fixed. However, if you removed the cross-member when you replaced the transmission mount, it may be out of alignment as the cross-member position can be adjusted. I would double-check the cross-member position, and you can re-align the bracket with the old witness marks on the chassis.
Thread Starter
Newbie
Joined: Apr 2024
Posts: 7
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c klasse
update:
soooo.... I have checked again, the engine does not jump which performing the test and the screws are firm.When Installing the trans mount I did not move the crossmember. The 3 screws under the mount will not fit in so I hold the transmission and pushed it a tiny bit (about 3mm) to the right, so the screws fit in , then I did a test drive, the problem persists.
2nd try....I tried to move the crossmember to the left for about 0.3cm comparing to the old witnes mark, the screws then fit in better,as the screws on the right side of the crossmember are already sitting on the egde of the hole, so I still need to push transmission to the right around 1mm!
in the test drive the unsmooth gear changing became much better, but it did not go away completely, especially when I accelerate slowly after stopping it completely.
So in conclusion , it seems the transmission is not in alignment anymore? looks to me it moved tiny bit to the left side...
Maybe you guys know what should I do in this case?
Any suggestion would be much appreciated? thanks!
soooo.... I have checked again, the engine does not jump which performing the test and the screws are firm.When Installing the trans mount I did not move the crossmember. The 3 screws under the mount will not fit in so I hold the transmission and pushed it a tiny bit (about 3mm) to the right, so the screws fit in , then I did a test drive, the problem persists.
2nd try....I tried to move the crossmember to the left for about 0.3cm comparing to the old witnes mark, the screws then fit in better,as the screws on the right side of the crossmember are already sitting on the egde of the hole, so I still need to push transmission to the right around 1mm!
in the test drive the unsmooth gear changing became much better, but it did not go away completely, especially when I accelerate slowly after stopping it completely.
So in conclusion , it seems the transmission is not in alignment anymore? looks to me it moved tiny bit to the left side...
Maybe you guys know what should I do in this case?
Any suggestion would be much appreciated? thanks!
Last edited by Genger; Apr 3, 2024 at 05:10 PM.
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Senior Member
Joined: Jun 2016
Posts: 462
Likes: 152
From: Panama City, FL
2020 C300, 2013 C250, 2000 Boxster S
update:
soooo.... I have checked again, the engine does not jump which performing the test and the screws are firm.When Installing the trans mount I did not move the crossmember. The 3 screws under the mount will not fit in so I hold the transmission and pushed it a tiny bit (about 3mm) to the right, so the screws fit in , then I did a test drive, the problem persists.
2nd try....I tried to move the crossmember to the left for about 0.3cm comparing to the old witnes mark, the screws then fit in better,as the screws on the right side of the crossmember are already sitting on the egde of the hole, so I still need to push transmission to the right around 1mm!
in the test drive the unsmooth gear changing became much better, but it did not go away completely, especially when I accelerate slowly after stopping it completely.
So in conclusion , it seems the transmission is not in alignment anymore? looks to me it moved tiny bit to the left side...
Maybe you guys know what should I do in this case?
Any suggestion would be much appreciated? thanks!
soooo.... I have checked again, the engine does not jump which performing the test and the screws are firm.When Installing the trans mount I did not move the crossmember. The 3 screws under the mount will not fit in so I hold the transmission and pushed it a tiny bit (about 3mm) to the right, so the screws fit in , then I did a test drive, the problem persists.
2nd try....I tried to move the crossmember to the left for about 0.3cm comparing to the old witnes mark, the screws then fit in better,as the screws on the right side of the crossmember are already sitting on the egde of the hole, so I still need to push transmission to the right around 1mm!
in the test drive the unsmooth gear changing became much better, but it did not go away completely, especially when I accelerate slowly after stopping it completely.
So in conclusion , it seems the transmission is not in alignment anymore? looks to me it moved tiny bit to the left side...
Maybe you guys know what should I do in this case?
Any suggestion would be much appreciated? thanks!
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Super Member
Joined: Jun 2016
Posts: 562
Likes: 75
Mercedes w204 4matic sport
Since the problem only appeared after you changed the motor & transmission mounts, I would continue to adjust the cross-member until the shifting returns to its prior smooth operation. The physical position of the shifter mechanism has changed in relation to the engine/transmission unit as the mounts are all new. There is some adjustment where the shift lever attaches to the side of the transmission, but I would stay with the cross-member for the moment. It's not always easy to judge if the transmission is out of alignment since it depends on your point of reference and can be skewed when you are on your back looking upwards. Of course, if the misalignment is significant, try re-centering and adjusting the shift mechanism. But try as much as possible to only adjust one item at a time, or you just end up chasing your tail!
Thread Starter
Newbie
Joined: Apr 2024
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c klasse
Interesting is when accelerating the car quickly (over 2000rpm ) the jerk become lighter. If I accelerate 1500 - 1800 rpm , the car then jerks shortly when the gear shifts. I wonder if reset the transmission at MB will help or rather do a oil change....-.-
Last edited by Genger; Apr 6, 2024 at 06:17 AM.
Member
Joined: Dec 2023
Posts: 217
Likes: 74
From: TN
2013 w204 c250 coupe & 2001 Dodge Ram 2500 24v Cummins
yes, pretty frustrated now, I used also rubber (brand is Febi).
Interesting is when accelerating the car quickly (over 2000rpm ) the jerk become lighter. If I accelerate 1500 - 1800 rpm , the car then jerks shortly when the gear shifts. I wonder if reset the transmission at MB will help or rather do a oil change....-.-
Interesting is when accelerating the car quickly (over 2000rpm ) the jerk become lighter. If I accelerate 1500 - 1800 rpm , the car then jerks shortly when the gear shifts. I wonder if reset the transmission at MB will help or rather do a oil change....-.-
I was going to suggest you reset the gearbox because that can cause some jerkiness if the car is trying to match driving styles.
You don’t need to go to MB to reset the Transmission gear box.
just google ‘w204 gearbox reset’ and follow the steps it’s very easy and takes only a few minutes.
report back and let us know if that helps.
I replaced my motor mounts and trans mounts on my c250 and did not have the issues you are describing after I did mine.
ant
Super Member
Joined: Jun 2016
Posts: 562
Likes: 75
Mercedes w204 4matic sport
Ive been following the thread for a couple days now.
I was going to suggest you reset the gearbox because that can cause some jerkiness if the car is trying to match driving styles.
You don’t need to go to MB to reset the Transmission gear box.
just google ‘w204 gearbox reset’ and follow the steps it’s very easy and takes only a few minutes.
report back and let us know if that helps.
I replaced my motor mounts and trans mounts on my c250 and did not have the issues you are describing after I did mine.
ant
I was going to suggest you reset the gearbox because that can cause some jerkiness if the car is trying to match driving styles.
You don’t need to go to MB to reset the Transmission gear box.
just google ‘w204 gearbox reset’ and follow the steps it’s very easy and takes only a few minutes.
report back and let us know if that helps.
I replaced my motor mounts and trans mounts on my c250 and did not have the issues you are describing after I did mine.
ant
Thread Starter
Newbie
Joined: Apr 2024
Posts: 7
Likes: 0
c klasse
Ive been following the thread for a couple days now.
I was going to suggest you reset the gearbox because that can cause some jerkiness if the car is trying to match driving styles.
You don’t need to go to MB to reset the Transmission gear box.
just google ‘w204 gearbox reset’ and follow the steps it’s very easy and takes only a few minutes.
report back and let us know if that helps.
I replaced my motor mounts and trans mounts on my c250 and did not have the issues you are describing after I did mine.
ant
I was going to suggest you reset the gearbox because that can cause some jerkiness if the car is trying to match driving styles.
You don’t need to go to MB to reset the Transmission gear box.
just google ‘w204 gearbox reset’ and follow the steps it’s very easy and takes only a few minutes.
report back and let us know if that helps.
I replaced my motor mounts and trans mounts on my c250 and did not have the issues you are describing after I did mine.
ant
thanks for the reply. I tried it but did not work for me. I will bring it to change oil and see...
Member
Joined: Dec 2023
Posts: 217
Likes: 74
From: TN
2013 w204 c250 coupe & 2001 Dodge Ram 2500 24v Cummins
From not seeing your car and doing the job myself, TO ME it sounds like you're either low on fluid or installed the transmission mount incorrectly. BUT can't confirm because we haven't seen the car. Also, it's funny that it started after you changed the mount and wasn't happening before.
when you say change the oil you mean transmission oil/fluid, correct?
Ant
Thread Starter
Newbie
Joined: Apr 2024
Posts: 7
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c klasse
Sorry to hear that didn't work for you. You're not leaking any transmission fluid anywhere are you? How many miles/kilometers are on the car ?
From not seeing your car and doing the job myself, TO ME it sounds like you're either low on fluid or installed the transmission mount incorrectly. BUT can't confirm because we haven't seen the car. Also, it's funny that it started after you changed the mount and wasn't happening before.
when you say change the oil you mean transmission oil/fluid, correct?
Ant
From not seeing your car and doing the job myself, TO ME it sounds like you're either low on fluid or installed the transmission mount incorrectly. BUT can't confirm because we haven't seen the car. Also, it's funny that it started after you changed the mount and wasn't happening before.
when you say change the oil you mean transmission oil/fluid, correct?
Ant
yes, i mean transmission fluid
can the fluid actually cause the unsmooth(mild jerk) while switching gears rom 2-3 or 3-4? the car is 12years old with 85000km
Joined: Nov 2016
Posts: 7,847
Likes: 3,499
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
If the tranny fluid has never been changed, you are LONG overdue. Find your car in the attached (or one for your year).
Member
Joined: Dec 2023
Posts: 217
Likes: 74
From: TN
2013 w204 c250 coupe & 2001 Dodge Ram 2500 24v Cummins
"Lifetime fluids" are for the "lifetime" of the manufacturer warranty. Which it's well over 4 years from time of manufacturing.
Check and see if you have any blue transmission fluid leaking anywhere around the transmission pan or gasket. My trans pan actually rotted through is what my local MB dealership told me when I took mine in for the trans service.
Ant
Joined: Nov 2016
Posts: 7,847
Likes: 3,499
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Tranny fluids (and motor oil) have time limits, as well as mileage. So, don't think you can go indefinitely if mileage thresholds are not met. It's unclear if doing a transmission service will fix your problems, but it may.
My tranny services on my C350 have been done according to schedule, but before the last change, my tranny would shift hard at slow speeds. I bought all the parts and had the local Mercedes dealership perform the service and I paid the labor. Since then, no more low speed hard shift. So, the tech may have also reset the tranny as part of the service.
My tranny services on my C350 have been done according to schedule, but before the last change, my tranny would shift hard at slow speeds. I bought all the parts and had the local Mercedes dealership perform the service and I paid the labor. Since then, no more low speed hard shift. So, the tech may have also reset the tranny as part of the service.
