PeachParts Mercedes-Benz Forum - View Single Post

Rick Miley · #8 10-10-2004, 05:01 PM

That's really odd. If it really is coming out between the shutoff valve and the injection pump, then you're going to have to replace the seal ring that is under there. Unfortunately, that means you'll have to take the intake manifold off to get to it. While you're in there, I would recommend replacing all those plastic fuel lines as well. They're not very expensive (under $10 each) and they are prone to leakage, especially when you disturb them. The shutoff valve (black box) is plastic and known to develop leaks as well. That's what I just went through replacing.

The exploded view you wanted is not in one drawing, it is in three that I will attach below. The first one shows the shutoff valve, which has three fuel lines (2 on top, 1 on bottom) attached to it. It has a tube that extends into the injection pump, and that tube has the seal ring on it. That seal ring is very easy to roll or pinch, so be careful when installing. The shutoff valve is held to the i.p. with two allen head bolts. The parts you're interested in from this drawing are:
32 - A 021 997 75 48 Seal Ring
29 - A 000 078 44 49 Shut-off valve

The next picture shows all the fuel lines that I recommend replacing. The clips on the ends of these lines are kind of counter-intuitive. You push the white part in (toward the hose) to release the line. They require quite a bit of force to pull out and push in, so be prepared to wrestle with them. Again, the seal rings are very easy to get out of place when installing. Part numbers for this picture:
32 - A 605 070 14 32 Line from thermostat to prefilter
119 - A 606 070 05 32 Return line from i.p. to fuel filter
126 - A 017 997 22 48 Seal Ring - fuel line and overflow valve
128 - N 007603 012102 Seal Ring - fuel line and overflow valve on i.p.
95 - A 605 070 15 32 Line from fuel filter to shut-off valve
83 - A 606 070 04 32 Line from feed pump to fuel filter
56 - A 605 070 07 32 Line from prefilter to shut-off valve
74 - A 605 070 08 32 Line from feed pump to shut-off valve

Now, any time you take the intake manifold off, you'll need to replace all the little plastic clips. They get brittle and break, so take them all off before you remove the manifold so that no plastic bits fall down into your engine! Also remove the black plastic cover over the valve cover, to make it easier to work here. Parts you'll need:
95 - A 603 078 01 41 Bracket (Qty 7)
92 - A 601 078 03 86 Shim (Qty 7)
104 - A 601 078 26 41 Bracket (Qty 2)

And finally, you'll need:
A 606 141 01 80 Intake Manifold Gasket

Look up a post by Lightman on how to replace glow plugs. He has detailed instructions and pictures for removing the intake manifold.