SL55/63/65/R230 AMG: flex disc or motor mount questions - please help
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Newbie
Joined: Sep 2012
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2004 SL55 AMG
flex disc or motor mount questions - please help
Hello!! New here. Just got my '04 sl 55 amg. love it but notice a strong shudder when i accelerate fast once it gets into 3rd gear. notice it less with the A/C off.
Couplr of threads discuss the flex disc as possible problem, others state it is a motor mount issue. I'm a girl, what is the difference and is it true if not fixed IMMEDIATELY it will cause driveshaft to be damaged?
Any and all assistance greatly appreciated.
Couplr of threads discuss the flex disc as possible problem, others state it is a motor mount issue. I'm a girl, what is the difference and is it true if not fixed IMMEDIATELY it will cause driveshaft to be damaged?
Any and all assistance greatly appreciated.
MBWorld Fanatic!
Joined: Dec 2004
Posts: 4,268
Likes: 253
Welcome.
The flex disk is a rubber cake- like shim installed at the end of the driveshaft. It's mission is to soften the torque spike hits on the drivetrain as well as quell vibrations in the driveshaft.
The motor mounts are oil filled rubber bushings (two- one on each side of the motor) upon which the engine block rests. Their mission is to allow the engine to twist/ move a bit when throttle is applied as well as quell vibrations transmitted from engine to chasis. The third bushing is the transmission bushing which serves to complete the triangle of bushings (two in the front, one in th back where the tranny is).
If the driveshaft bushing is not fixed you will lose the mid-support bearing which is a ***** to replace. In rare ocassions You can also wear prematurely the tranny tail bearing.
The engine and tranny bushings can be diagnosed easily as they will leak when going bad. The cake on th driveshaft can visually be inspected for tears, deformation and missing rubber chunks.
The flex disk is a rubber cake- like shim installed at the end of the driveshaft. It's mission is to soften the torque spike hits on the drivetrain as well as quell vibrations in the driveshaft.
The motor mounts are oil filled rubber bushings (two- one on each side of the motor) upon which the engine block rests. Their mission is to allow the engine to twist/ move a bit when throttle is applied as well as quell vibrations transmitted from engine to chasis. The third bushing is the transmission bushing which serves to complete the triangle of bushings (two in the front, one in th back where the tranny is).
If the driveshaft bushing is not fixed you will lose the mid-support bearing which is a ***** to replace. In rare ocassions You can also wear prematurely the tranny tail bearing.
The engine and tranny bushings can be diagnosed easily as they will leak when going bad. The cake on th driveshaft can visually be inspected for tears, deformation and missing rubber chunks.
Last edited by alx; Sep 23, 2012 at 10:09 PM.
