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#1
10-24-2004, 08:40 AM
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OM603 head bolts
Has MB updated their torquing procedures for the head bolts on the OM60x.xx series of engines? They have changed the head and gasket several times. My service CD specifies a four stage, 15nm, 35nm, 90°, 90°. I’ve done this a few times and that last 90° is pretty nerve wracking. You could swear that the bolt is going to snap.
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Bob D. Parrish, FL 1 SDL, 1 D, 1 TD, 1 Mog 
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#2
10-24-2004, 09:18 AM
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They are referred to as stretch bolts and the last 90 degrees feels like you might be stripping out the threads, but you aren't. Because they stretch, they are good for one use only.
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#3
10-24-2004, 09:29 AM
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I believe there is a specification for the bolts, and as long as they are still within spec, they can be reused.
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Michael LaFleur '05 E320 CDI - 86,000 miles '86 300SDL - 360,000 miles '85 300SD - 150,000 miles (sold) '89 190D - 120,000 miles (sold) '85 300SD - 317,000 miles (sold) '98 ML320 - 270,000 miles (sold) '75 300D - 170,000 miles (sold) '83 Harley Davidson FLTC (Broken again) :-( '61 Plymouth Valiant - 60k mikes 2004 Papillon (Oliver) 2005 Tzitzu (Griffon) 2009 Welsh Corgi (Buba) 
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#4
10-24-2004, 11:09 AM
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I've measured mine and according to the published spec they are still good. I tried to order a new set but only recieved 14 of the 20 some odd required. My question is more has the procedure for torquing changed. When MB came up with a new gasket for the OM352 they changed the method.
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Bob D. Parrish, FL 1 SDL, 1 D, 1 TD, 1 Mog
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#5
10-24-2004, 02:47 PM
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Heres a wild shot but has anyone used ARP head studs, Is there even an application? THey don't stretch and would provide a far more even and stable torque.
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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#7
10-24-2004, 10:49 PM
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Makes a world of difference in the Honda world, particularly people with turbos installed. Studs don't need replaced, you torque to spec, not tourque to yeild.
Better clamping force and better gasket sealing under high boost. Would have to be a better solution.
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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#9
10-24-2004, 11:17 PM
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Manual calls for at least a 10 minute wait between the two 90 degree turns. I waited an hour. Also you need to oil the threads and washer surface, if they have a washer, before installing per manual. If no washer then do not oil contact surface with head. That will throw off the torque values.
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1995 S-350 370K + SOLD 1952 220B Cabriolet 39K kilometers + SOLD 1998 E300D 310K + 2012 E350 BlueTec 120K
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