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#1
08-31-2008, 12:14 PM
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Broken screw in prefilter assembly
I was changing the pre filter and fuel filter and made the mistake of over torquing the screw that holds the pre filter in place.
What would be the easiest way to get that sucker out? or would it be better to get a new assembly? where can I get the new assembly? 99 w210 E300 157k miles. Last edited by ramtony; 08-31-2008 at 01:06 PM. Reason: car model 
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#2
08-31-2008, 12:31 PM
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What car? The only screw on a prefilter on a 123 or 126 is the screw in the stainless steel clamp. But clamp should be loose if screw is broken.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#3
08-31-2008, 12:32 PM
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By any chance, might this be in a Mercedes? An OM606 perhaps? (I don't like to guess.) In any case, an EZ-out should remove the broken screw for you. The filter assembly would almost certainly have to come from a dealer and you wouldn't like the price, which would buy you a whole set of EZ-outs, the matching drill bits, and a good drill motor.
Request: please put your car's year and model number in your signature line. Jeremy
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 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#5
08-31-2008, 02:05 PM
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Use a center punch to start the drill bit and make certain to tape the opening to the pre-filter shut before you start drilling and making shavings.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.)
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#6
08-31-2008, 04:23 PM
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I think I read here a few times to limit torque on a steel bolt into aluminum at around 7-10 nm.
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2009 E320 Bluetec 117,000 1995 E300D 306,000 Sold 1996 Ford Taurus LX 130,000 Sold 1985 300TD Still 225,000 Sold 2016 Ford Fusion 24,900
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