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  #1  
Old 02-13-2003, 06:20 PM
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Join Date: Jan 2001
Location: Cedar Rapids, Iowa
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420 SEL ball studs loose

Should the ball studs revolve in the head? About half of mine spin freely but the picture of a new one shows threads. What's the deal?
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'89 420 SEL "Moby Dick"
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  #2  
Old 02-14-2003, 03:36 AM
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Gregga

Are you referring to the *engine* ball studs?

Haasman
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  #3  
Old 02-14-2003, 09:11 AM
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Join Date: Apr 2000
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There are two parts to a ball stud. The ball itself is part of the plunger and will spin. The outer part screws into the head and most certainly should not spin.
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'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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  #4  
Old 02-14-2003, 10:22 AM
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Yes, the engine ball studs are loose in the heads. I had the engine apart to put in a short block and out of curiosity grabbed the hex with my fingers and it spun free. I tried to tighten it but it felt like there was no resistance, like two machined parts sliding, not like stripped threads. I have one on that side that's making a lot of noise but almost feel afraid to get into it if the threads are all gone.
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Gregga
'89 420 SEL "Moby Dick"
'30 Ford Coupe
'31 Ford Slant Windshield Town Sedan
'33 Ford Pickup
'34 Ford Pickup
'01 Honda Passport
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  #5  
Old 02-14-2003, 11:29 AM
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My experience is with the 380, but I would be very surprised if the other engines did not have screw-in ball studs.
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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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