I need to change out the rail in the next few days and i do not have a guide. I really dont want to mess up and drop something in the engine anyone have this info?

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1979 240D with a 617 turbo diesel.

Which car are you going after? On my old 220D the rail was held by a pin that was pressed into a bore in the block that could be removed from the front of the engine (the front of the chain box), without a lot of trouble. I believe it had about a 10 mm female thread, and I made a puller with a bolt, nut and stack of washers. I believe I did have the radiator out as I was removing and repairing the head, and once the alternator, radiator and water pump were out of the way the pin was pretty easy to find and get out. With the pin out, the rail is free to come out, unless you have one that won't fit through the chainbox area of the head. In that case the rail comes out once the head is off. Good luck, maybe someone will know the specifics of your situation once we know which car you are working on.

Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)

sorry its my 300sd. where is this pin located on the front of the engine? I have a good rail in a parts engine that is not in a car so i can get a good look at it before tearing the car apart.

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1979 240D with a 617 turbo diesel.

That's a difficult and complicated job and you'll need the FSM and some specific pin pullers to accomplish it.

I can fax you the manual sheets if you have a fax machine. There's 20 steps to the procedure.