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#1
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M103 Head Bolts - Curious About Bolt-Washer Combination
I'm doing a head gasket job on my brothers '89300SE (W126). The head bolts are the newer/shorter version (flange type to be used without washers)...BUT washers are in place (the 5 mm space type that were used with the older/longer bolt versions).
I'm just curious if anyone ever ran into this before. It appears this is the first time the head has been off the car (gasket is Elring, some other indications (intake valve seals are the old metal collar version), etc). So, I'm thinking this was done AT THE factory. Everything I've ever read indicates when they made the change (circa 1988?) they made it completely (i.e. changed to shorter bolt and dropped use of the washer simultaneously). Anyway, just curious if anyone ever came across this. As for reassembly, my plan is to omit use of the washers (once I've checked depth of threaded hole on block, of course).
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Syntax26 1995 MB E420 (lowered) 1989 MB 300SE (sold to brother) 1975 MB 280 (sold) One damn fine jacked-up golf cart |
#2
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Yes, the newer bolts were exactly the same threaded length (new 102MM) as the older bolts (with washer).
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#3
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MB Doc,
Thanks for the post. Actually, I did already know that the long/old style bolts (105mm), when used with washers, were replaced by the new/short(102mm) bolts, and the thread length was the same. I guess I didn't clearly write my first post. What I found on the M103 I'm doing is it had the new/short bolts, but ALSO had the washers. And since it seems to me this is the original head gasket, I'm concluding this arrangement (new bolts with washers) was done at the factory. WHICH is something I didn't think happened. I was just curious is anyone had ever come across this arrangement before.
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Syntax26 1995 MB E420 (lowered) 1989 MB 300SE (sold to brother) 1975 MB 280 (sold) One damn fine jacked-up golf cart |
#4
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Page 2 talks about it here:
http://www.w124-zone.com/downloads/MB%20CD/W124/w124CD1/Program/Engine/103/01-4050.pdf Basically the new bolts don't need the washers from the old.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#5
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Don't forget to lubricate the bottom of the new headbolt 'washer', which is included in the new bolt, which is a 102 part. I did a valve job on my M103 89 300SE W126 when I still had it.
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Regards Warren Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL ENTER > = (HP RPN) Not part of the in-crowd since 1952. |
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