Modifying chassis rail on a W111 Coupe to fit a 5.0 M117 - Page 2 - Mercedes-Benz Forum

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post #11 of 12 (permalink) Old 04-12-2010, 11:14 AM Thread Starter
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Pagodino:early 5.0 heads only have smaller inlet valves; exhaust valves and manifold have the same diameter as on the 560 (and they can interchange).

mtkst19: do you think that by heating the area the job will come out easier?
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post #12 of 12 (permalink) Old 04-12-2010, 11:43 AM
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heat wont hurt the actual metal-- just make sure you are not putting heat into anything else be it electrical or fuel lines. i would use a benz-omatic preferably w/ a rosebud tip on it but the stock tip would do the job. Map gas is better to use to over propane. It is a hotter burning gas. All you are doing is adding heat to help make the metal more "elastic".

the paint will show signs from the heat and probably bubble off if you get a lot of heat into it-- but after you hit it with the hammer it will be less than pretty to begin with. then after you smack/dent the area in, you clean it up and make it pretty. give yourself enough clearance to take ito account the rock of the engine too.

Aim for controlled blows and try to "dome" the rail, instead of a bunch of heavy hits that will look like a bunch of craters. Realistically, you could go to town w/ a 5 lb mini sledge and get a dent enough to fit the manifold-- thats the race car no one cares about looks way.

However, take your time and use controlled blows so it dont look like hell afterwards. A little patience now will save you a lot of clean up work afterwards. Get it right you can hide the hammer marks w/ a skimcoat of putty and paint it w/ oem paint mixed into a spray can and no one would be any wiser to the work you have done.

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