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#1
09-10-2003, 08:01 PM
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Corroded Bolts - What's the best preventative?
Greetings All,
In the process of replacing the water pump on my '86 300E I've found several bolts with corrosion heavy enough to make it difficult to extract the bolt (the 10mm belt tensioner through-bolt and the long 8mm bolt that goes through the upper part of the "Y" bracket in front of the tensioner). I'm replacing the bolts and cleaning out the holes as best I can, but I'd like to know anyone's opinion on what to use to prevent further problems of this sort. I was thinking of either using waterproof wheel bearing grease (the type used on boat trailers) or anitsieze (the silver-grey type). Which would be better, given the environment, or what other suggestions might you have? Thanks, Gary 
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#4
09-10-2003, 08:34 PM
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The most common anti-seize is made by Loctite/Permatex.
The copper stuff is meant for high heat applications ( exhaust manifolds, etc. ). You want the silver coloured stuff for your application. 
__________________
2007 C 230 Sport.
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#5
09-10-2003, 10:21 PM
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There's something like 8 different formulations of neversieze that I found in McMaster Carr catalog.... copper, nickel, aluminum, moly disulfide, graphite, teflon, etc. Nickel is for very high temp applications. Copper is for high temp and general applications. It doesn't make a whole lot of difference which kind you get. Their primary function is all the same. I think the copper stuff is most widely sold, though it appears grey and Permatex doesn't specifically list the formulation on the bottle.
__________________
95 E320 Cabriolet, 159K
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#6
09-10-2003, 10:30 PM
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Also make sure that you are using the Mercedes antifreeze. Remember it is also an antirust compound, it is PH neutral. The rust your seeing is partially due to either the lack of Mercedes antifreeze and/or the lack of changing it every 2 years. Those bolts are exposed to the cooling section of the engine block.
Dave
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1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car
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