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I bought my C43 9 months ago with an issue, that I thought was related to the flex discs/driveshaft support. When I accelerate from standstill, I can hear a clunk when it shifts in second, doesn't do it under any other circumstances or if I go hard from second. Flex discs, driveshaft support/bearing, transmission mount are brand new. No issues with the transmission, I even went ahead and did a maintenance on it (fluid, filter, plug and pan).I'm thinking it might be my engine mounts, it already shows signs of use since there's a pretty big vibration when idling in ''Drive''. Any thoughts?
I also have a weird issue where I can hear a noise when driving on the front passenger side. It's repetitive (and depends on my speed), not a steady sound like a humming bearing. The weirdest thing is that, prior to lifting it up to do a few repairs, it wasn't doing it. I have my doubts that it could still be the bearing since nothing seems to rub. Maybe having the car up for 2 weeks stressed the bearing that was already on its way out?
Every single part that I removed so far on this 261k km (161k miles) C43 were original (minus the transmission filter).. stamped 1998.
From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
I would defo check the engine mounts. They do wear out and need changing. I had a engine support fracture on mine and when replacing the broken support, I also changed the two mounts at the same time. Get some heavy duty one like those used for the M113K engine. They fit perfectly and you will certainly feel the difference when driving. I'll see if I can find my descriptive thread...
So my engine mounts are totally toast, pretty sure they are the cause of the issue. I also checked for my spinning sound that increases with speed. Comes from the driveshaft/transmission area. All the parts there are brand new. Maybe the fact that everything is now leveled but the engine isn't creates that sound?
From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
Originally Posted by TheOldschoolers
So my engine mounts are totally toast, pretty sure they are the cause of the issue. I also checked for my spinning sound that increases with speed. Comes from the driveshaft/transmission area. All the parts there are brand new. Maybe the fact that everything is now leveled but the engine isn't creates that sound?
Could be the reason....
- Have you tried removing the air-filter and placing a spirit level on the intake? It should be level.
- Have you tried doing the throttle test? Give throttle movements and see what the engine does. If it rises in an exagerated manner, that confirms the mounts being toast. BTW, it may be a good idea to invest in a special angled spanner to remove then replace the top bolt on the engine mounts. I recommend you get some heavy duty mounts like those found on M113k engined MBs
- Have you tried removing the air-filter and placing a spirit level on the intake? It should be level.
- Have you tried doing the throttle test? Give throttle movements and see what the engine does. If it rises in an exagerated manner, that confirms the mounts being toast. BTW, it may be a good idea to invest in a special angled spanner to remove then replace the top bolt on the engine mounts. I recommend you get some heavy duty mounts like those found on M113k engined MBs
I tried the throttle test, it rises too much and the vibration at idle is way too much. I already planned on getting the M113K mounts but thanks for the tips! The special tool for M113 engine mounts top bolt doesn't fit the C43 right? Looks too tight compared to other M113 equipped cars.
From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
Originally Posted by TheOldschoolers
I tried the throttle test, it rises too much and the vibration at idle is way too much. I already planned on getting the M113K mounts but thanks for the tips! The special tool for M113 engine mounts top bolt doesn't fit the C43 right? Looks too tight compared to other M113 equipped cars.
If I'm not mistaken, the angled tool fits all M113 equipped cars, except I believe it exists in two sizes. Just need to find the right one. I'll check and get back in a moment....
The C43 seems to have less clearance to use this tool though, I've heard good things about a wrench and pry bar for our cars! Will try and get back to you if it worked or not. I was thinking about buying the tool but when I saw the very limited space compared to other M113 equipped cars, I had a doubt that it would work as good.
From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
I used a regular wrench. It will work but be aware you will not a lot of patience. It will be also impossible to torque to correct specs without the appropriate tool
Well, my engine mounts were.. original. Like, 1998 with 161k miles original. And I'm pretty much sure that the driver's side being now a 2-piece mount isn't normal. I went with the M113K mounts.
No more clunk on hard accelerations! Can't even feel that the car is started now. Still hear a bit of the rubbing sound, really starting to think it might only be the insulation over the flex disc.
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Good going BTW 
