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  #1  
Old 03-19-2002, 05:29 AM
David C Klasse's Avatar
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Downshift Clunk

I know this has been covered before, but mine occurs when accelerating.

If I am going between (roughly 45, to 55), and I floor the gas, downshift to second, I sometimes hear a clunk. It only happens when cruising about 50 when downshifting to second gear. Any ideas?

722.4 on C280.
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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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  #2  
Old 03-19-2002, 08:46 AM
Matt Crooke
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Is the noise coming from the gearbox or the back axle?
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  #3  
Old 03-19-2002, 10:09 AM
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Join Date: Feb 2002
Location: east coast
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How many miles on the C?
Could be many things, first check fluid level, and trans filter.
Second inspect all the components of the driveshaft.
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  #4  
Old 03-19-2002, 10:15 AM
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Join Date: Jul 2001
Location: Western Michigan
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Could also be wear (free play) in the rear differential.
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  #5  
Old 03-19-2002, 04:34 PM
David C Klasse's Avatar
CheFrac is Back!
 
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
I have 121k miles.
Trans has been serviced by dealer at 20k intervals or less. I am due for a 30k mile service pretty soon.

Lower control arm bushings have been replaced, as has the front flex disc.

The noise sounds like it's coming from below me or in the engine bay... pretty sure it's not the rear.

Thanks.
__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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  #6  
Old 03-19-2002, 09:55 PM
Mattman
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Can you replicate the clunking by holding the car in a lower gear and rapidly accelerating? Try to replicate the engine movement that would occur with a downshift and sudden increase in revs - you might find that it's actually something like an AC hose or similar that knocks on something when the engine suddenly revs out.

Cheers
Matt.
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  #7  
Old 03-19-2002, 10:36 PM
David C Klasse's Avatar
CheFrac is Back!
 
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
It doesn't happen on any other occasion, except when going into 2nd @ high RPMs. I just had the trans serviced a few k miles ago, and the fluid level looks accurate. OTherwise, it shifts wonderfully.
__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
Reply With Quote
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