Fuel leak, 606 TD engine - PeachParts Mercedes-Benz Forum

Parrot of Doom · #1 11-06-2006, 10:29 AM

Hi there.

I have a diesel leak from around the fuel delivery system on my 1997 W210 E300 TD.

In this image, taken from below the car, the front of the car is to the bottom of the photograph. The main block of the engine is to the right of the photograph.

The leak is roughly in the centre of the photograph, where the flashlight beam is centered. Thats where the diesel is coming from, its dripping slowly off the bottom of that plastic cylinder while the engine is running. The rate of loss is about 1 drip every 10-15 seconds. Not a big deal, but with winter approaching, wet roads, and motorbikes - not something I want to leave.

Sorry the photo is a bit poor, but here is the location from above:

The leak appears to be somewhere from the side of the injection pump, at a point where one of the fuel pipes connects to the body of the pump.

There is no air in any of the pipes that I can see, and starting the car is a doddle.

I'm hoping that the leak is from one of the connections, and not the pump!

Can anybody help?

TMAllison · #2 11-06-2006, 12:41 PM

Can't see the leaky area in your photo.

Probably is comming from one of the fuel line o-rings connecting to the shutoff valve or from the o-ring that seals the shut off valve to the side of the IP.

Both are very common.

Phil has the shutoff o-ring avail and I believe the o-rings for the fuel lines too. If your fuel lines are original is probably time to replace them rather than only replacing the orings as they get yellow and brittle with age.

To pull the fuel lines, push the white horseshoe clips tightly closed (make a ringer) to spread the shoulders of the clips attaching the fuel lines.

Parrot of Doom · #3 11-06-2006, 01:12 PM

Yes, all the lines are slightly yellow so its probably a good idea I guess. I planned to remove the intake manifold and clean it all out, including the EGR valve, so its probably a chance to do both jobs at once.

I'm in the UK so I'll probably just use a dealer, dealers are cheap for parts around here (shockingly)!

Here is the leak, I've highlighted it:

TMAllison · #4 11-06-2006, 01:56 PM

Missed you were from across the pond and now understand yours is actually a 97 turbo which was not available here.

Your IP is subtly different than my 99's.

I think the part you highlinhgted would be the shutoff valve, on the 99 it is black plastic, your appears to be metal. Mine is held in place by 2 torx bolts, a nipple extends into the IP and is sealed by a o-ring. Suspect that is your problem.

Parrot of Doom · #5 11-06-2006, 03:56 PM

Thanks, it is actually plastic (just a poor photograph).

McCool300TD · #6 11-06-2006, 04:10 PM

Hi Parrot

230K here i posted on MB Club so you have my views same as above, good luck. It will take you 2 hours cleaning the manifold if you decide to take it off they are dirty but worth doing and for all the cost of a gasket i would renew it too.

Good luck

McCool300TD (230K)

F18 · #7 11-06-2006, 04:17 PM

I replaced the lines marked #74, #56, #95 and the O ring for the "shut-off" valve mounted to the side of the IP about a year ago with a similar leak. The leak never effected the performance of my 98 E300TD...it just made a mess.
It can be done without removing the manifold. Just move the wiper fluid resevoir out or the way. The parts in US $ about $40.00 which would be about ~20.00 BP. Need some Torx screw drivers to remove shut-off valve.
It took me about 30 minute including clean-up. I would start with that.....

Good Luck

aklim · #8 11-06-2006, 05:01 PM

While you are there, take the glow plugs out and anti-sieze them

Parrot of Doom · #9 11-06-2006, 05:18 PM

Thanks for all the excellent help!

I'll do it at the same time as removing the manifold, its much easier I think, and I'll be able to get a clear picture of anything else that might need 'doing' when in there.

The glow plugs are less than a year old so I'll leave them alone for now, but no.2 glow plug is welded onto the head with a washer and is faulty. That job will have to wait until I have some spare cash to get it done. I could remove the weld, but there is the possibility that debris may fall down into the cylinder and thats a head-off job! The last owner did the weld, I can only presume they stripped the threads and panicked

Idiot.

ILUVMILS · #10 11-06-2006, 05:28 PM

Anyone who owns an OM606 powered MB should check out this thread. Ultra-Low Sulfur Diesel Fuel

TMAllison · #11 11-06-2006, 05:45 PM

Parrot & McCool....are siezed glow plugs in the OM606.962 a common forum topic on your side of the pond?

aklim · #12 11-06-2006, 05:49 PM

Quote:

Originally Posted by TMAllison

Parrot & McCool....are siezed glow plugs in the OM606.962 a common forum topic on your side of the pond?

If it is the same design and materials, why should it be different?

TMAllison · #13 11-06-2006, 06:42 PM

Quote:

Originally Posted by aklim

If it is the same design and materials, why should it be different?

They've had them longer and had more of them than we got. Larger sampling. Curious if they are an issue on the European forums.

Parrot of Doom · #14 11-06-2006, 06:54 PM

Siezed glow plugs are very much an issue over here, the advice seems to be to swap them out at regular intervals. Design fault on an otherwise excellent engine.

Thanks for the low sulphur fuel link, but we've had LSDiesel over here for years and years, and its not a big issue.

ILUVMILS · #15 11-06-2006, 07:14 PM

It's the Ultra-Low Sulfur fuel that's causing the problems. After it became available here, it didn't take long for the leaks to start. We've begun keeping an over-supply of fuel lines in stock, and they're flying off the shelves.