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  #1  
Old 12-07-2004, 10:21 AM
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Join Date: Mar 2003
Location: Convent Station, NJ
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'85 380 Shuttling upon acceleration...experience this?

Had a few things done by Indy not too long ago.....Passenger side camshaft, rockers etc.
I noticed shortly after that, when I accelerate, that I feel a shuttling / vibration through the pedal...and probably through the seat...not sure. It happens most pronounced under hard accelearation from stop but also happens less so any time I accelerate.

I'm thinkling it may be engine or transmission mounts. Any educated guesses?

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Rick

'85 380 SL (sold)
'85 Carrera Flatnose
'71 280 SL Signal Red/Cognac
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  #2  
Old 12-07-2004, 10:56 AM
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Location: Falls Church, VA
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If it's a thumping type of vibration, I would bet that the driveshaft center bushing/bearing, or the front flex disc have given up. Maybe both.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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  #3  
Old 12-07-2004, 11:27 AM
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Hmmm, not quite a thumping but a vibration in the drivetrain....no noise to speak of...just the shuttle vibration as I accelerate.

Would the flex plate/driveshaft or center bearing be obvioous if worn?

BTW, Thanks for the reply, Chuck.
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'85 380 SL (sold)
'85 Carrera Flatnose
'71 280 SL Signal Red/Cognac
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  #4  
Old 12-07-2004, 01:28 PM
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Join Date: Apr 2000
Location: Falls Church, VA
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The rear flex disc is easy to check out.

To get a look at the front disc, you need to remove a serious metal plate that forms the bottom of the transmission tunnel. If you do that, then you can shake the driveshaft and if it moves, you probably need a new center bearing.

Warning - very dirty job.

The front flex disc has a sort of webbing design that helps it act as sort of a shock absorber. On my 280SL with 181K, this webbing was completely broken out. The center bearing was toast.

A good repair "package" is both flex discs, the center bearing, and rear trans mount. You need a special puller and press to r/r the center bearing. I took my driveshaft to Herr Fuchs, and he charged me an hour's labor for the r/r.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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