This part leaks fuel, can I fix it?? - PeachParts Mercedes-Benz Forum

1goos4u · #1 08-09-2009, 10:50 PM

Once again, please forgive my ignorance on the subject of the MB diesel engine. On my 240D, I noticed it has been leaking diesel fuel out of this part, which sits atop the injector pump. I removed it hoping to examine it closer and figure out how to fix it but now I'm kind of stuck. The fuel leaks from the ring towards the top, where I have placed the blue arrow. I dont' know if this part comes apart any further and if maybe there is a seal in there I could replace. Please help if you would be so obliged! This leak has been slow, more like a seep, but it is consistent and makes the area around the car smell like diesel fuel ever so slightly. Here are some pics:

Also kind of curious as to what this part is called...like I said earlier...I'm a total rookie at diesel engines.

lietuviai · #2 08-09-2009, 11:25 PM

I somehow think that this part should not have been removed by even someone who really isn't a rookie. I don't consider myself a rookie and I usually just stop at injector lines on the IP and go no further.

1goos4u · #3 08-09-2009, 11:34 PM

Well I hope I didn't screw something up real bad...I just unscrewed the injector line and undid the two bolts holding it onto the injector pump and it lifted right out.

lietuviai · #4 08-09-2009, 11:39 PM

Quote:

Originally Posted by 1goos4u

Well I hope I didn't screw something up real bad...I just unscrewed the injector line and undid the two bolts holding it onto the injector pump and it lifted right out.

Honestly I don't know if you did or not. I added an attachment to my previous post that warns not to remove the injection element otherwise necessitating bench adjustments of the IP.

kerry · #5 08-09-2009, 11:43 PM

I believe that is the delivery valve. And yes, I think you should probably have left it in place. People with more experience with the IP will have to comment on the leak and what procedures you're going to have to follow to reinstall it. Forced Induction would have been a good resource on this question but in keeping with good Amish practice, he has been officially shunned.

lupin..the..3rd · #6 08-10-2009, 12:49 AM

FWIW they give the same warning for the delivery valves on the 606 motor. I've removed all six delivery valves to replace leaky O rings on my car and didn't have any problems. You just need to be very VERY clean about it, and also very careful to put everything back together exactly as it was.

1goos4u · #7 08-10-2009, 01:35 AM

Quote:

Originally Posted by lupin..the..3rd

FWIW they give the same warning for the delivery valves on the 606 motor. I've removed all six delivery valves to replace leaky O rings on my car and didn't have any problems. You just need to be very VERY clean about it, and also very careful to put everything back together exactly as it was.

Thanks for the inspiration. I read the DIY Wiki thing and saw the delivery valve o ring replacement DIY and it didn't mention anything about it so I am thinking I am ok as long as I don't run the car or move it around with the one del. valve out.

So anyone know if it comes apart or even where I could get a replacement? I can't seem to find them listed on any auto parts sites..

sasquatchgeoff · #8 08-10-2009, 02:04 AM

Look in the yellow pages for diesel injection service - they will have the parts.

Bio300TDTdriver · #9 08-10-2009, 10:45 AM

Quote:

Originally Posted by 1goos4u

Thanks for the inspiration. I read the DIY Wiki thing and saw the delivery valve o ring replacement DIY and it didn't mention anything about it so I am thinking I am ok as long as I don't run the car or move it around with the one del. valve out.

So anyone know if it comes apart or even where I could get a replacement? I can't seem to find them listed on any auto parts sites..

You pulled the negative battery cable before you started, right?

zeke · #10 08-10-2009, 10:53 AM

Why pull the negative battery cable?

Not dealing with gasoline here - so not due to explosion hazard, and the IP is mechanical, not electric, so stray current isn't going to move the internals.....confused?

Bio300TDTdriver · #11 08-10-2009, 10:59 AM

Quote:

Originally Posted by zeke

Why pull the negative battery cable?

Not dealing with gasoline here - so not due to explosion hazard, and the IP is mechanical, not electric, so stray current isn't going to move the internals.....confused?

Well it is just a good rule when working on a vehicle. Having typed that do I do it every time, no.

Why, there was a member who left his hooked up and was working on something like the IP or some else timing related. His brother wanted to move the car and tried to start it. I don't remember the specifics or the outcome, but he was less than happy when he posted about it. So unless the OP is the only one at that house or with keys, he may want to pull the cable. That should make it harder to start the car.

kingdoc1 · #12 08-10-2009, 11:17 AM

What you have removed is one of the injection pump elements. Notice the slotted holes that hold-down studs went through--this is the adjustment for the volume of the particular element. The adjustment needs to be made on a flow bench at a fuel injection shop.
What I am saying is, no, you should not have removed or even loosened that part, and now you need to remove the IP, take it to a diesel injection shop and have it calibrated. You can't get it right without a flow bench. They will be able to fix your fuel seep at the same time.
I know this probably isn't what you wanted to hear, but it's the truth.

1goos4u · #13 08-14-2009, 09:22 PM

Hello all,

I wanted to thank everyone for their help (even though, yes, it was exactly what I did NOT want to hear)

. Stupid me! But, this is part of the learning process, no?

So here is my update. With everything considered, since I already had removed the delivery valve, I realized it came apart and I think I fixed the fuel leak at least. So, with (I hoped) nothing else to lose, I put the valve back onto the injection pump, connected the fuel line that runs to the injector, and thought I would drive it out to a local diesel shop on my next day off and have them look it over. This is my 2nd car, registered antique, and I am the only one who drives it (to answer a previous query). I went to start it and it will not start now! It cranks fine, the starter runs, but there is no start. I took off the fuel line to the delivery valve I had taken off, and the pump does not send any fuel to the line. I also checked the line at the other end of the injector pump, and no fuel is coming out of that delivery valve when the ignition is cranked.

So what do I need to do now to get it started? Is there typically fuel sent through the fuel lines when you go to crank the car w/ the ignition? I do appreciate all the input.

Diesel911 · #14 08-14-2009, 09:54 PM

Quote:

Originally Posted by kingdoc1

What you have removed is one of the injection pump elements. Notice the slotted holes that hold-down studs went through--this is the adjustment for the volume of the particular element. The adjustment needs to be made on a flow bench at a fuel injection shop.
What I am saying is, no, you should not have removed or even loosened that part, and now you need to remove the IP, take it to a diesel injection shop and have it calibrated. You can't get it right without a flow bench. They will be able to fix your fuel seep at the same time.
I know this probably isn't what you wanted to hear, but it's the truth.

Yes!
Rotating that unit adust the fuel output; and each one is adjusted seperately on a Calibration Stand where they measure the Flow or actually measure the output in a graduate tube.

The Metal Shimms that were under it were also important as the Timed the unit the the individual Camshaft Lobe.

If you did not carefully mark that unit so that it cam be put back exactly where it came from and whith the exact same shims under it you will be extrememly lucky to get it back where your engine will run correctly.

If you put it back in and it functions perfectly continue your string of good luck and go buy a Lottery ticket.

kerry · #15 08-14-2009, 10:55 PM

You've lost your prime. Prime the hell out of it.