Ok, so I've been working on diesel leaks on my OM606.910 NA diesel.

When I remove the intake manifold, underneath there was a hose loose. Please see pictures below - it's the one going up in the first picture, or coming out of connection #6 in second picture. Where should it go? What's it for?

Thanks a ton in advance!

__________________

1985 W460 300GD OM617.912 w/ STT turbo (ongoing OM606 engine swap)
2011 W212 E220 CDI

Both the "up" and "down" hoses go to actuators (flaps). One you can see in your first picture, at bottom. The other (loose hose) is in the crossover tube. The hose popped loose when you lifted the crossover up and out. You may want to trim the hose a bit to get "new" rubber that will grip better. Thanks for providing good pictures.

Jeremy

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

So that's what a N/A OM 606 manifold looks like from the bottom!

I have the turbo 606, it does not have the flaps. Just the boost and EGR hoses.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

I have a '98 e300 which has a different 606 engine. I had a fuel leak from a crack in the shut off valve. I didn't discover it until the second time I took off the intake manifold to deal with the leak. Check the shut off valve for leaks.

Also, there is a sold separately, small lime colored O ring on the fuel line that fits on the engine side of the shut off valve and is attached to it with a banjo bolt. Make sure you have it before you start or you may be making a special trip to the dealer to get it. That O ring is on the banjo bolt and not on the fuel line.