Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-23-2007, 05:12 PM
Registered User
 
Join Date: Jul 2003
Location: Ocean Isle Beach, NC
Posts: 2,437
606 engine fuel pump leak

I'm really dangerous now - my box of parts arrived and I started working on my fuel leak.

Here is the original thread on my situation if anyone cares to review - 606 leaking diesel again. Basically I was positive that my leak was coming from the gasket where the fuel pump mounts to the injection pump. That's where the wetness started. Everything above that was dry. MBDOC mentioned in a message that if the leak was coming form that gasket that it would be black engine oil not clear diesel fuel. I didn't comprehend that, but once I took the fuel pump off, I understood. This fuel pump is very similar to the fuel pump on my ponton that I have removed a number of times and even rebuilt. There is a small cam/lobe from the engine that pushes the rod on the fuel pump creating a suction/vacuum that moves the fuel. The fuel pump has two separate compartments. The compartment mounted against the injection pump is bathed in engine oil. The body of the fuel pump is sealed off from that compartment and has two fuel lines connected to it. See the photos below to see what I'm talking about. The first photo shows where the fuel pump is mounted and you can see the black engine oil in the mounting hole. The other two photos show that the fuel pump is sealed between the fuel side and the engine side. I had planned to replace the O rings, spring and valve in the fuel pump, but since it is a sealed unit and seems to be functioning properly when I depress the rod, I'm leaving well enough alone there.

In addition to fixing my leaking fuel pump gasket which now appears to not be the problem, I also had plans to replace all the O rings with viton and replace all the fuel lines. Today I replaced the fuel shut off O ring, the fuel pump gasket, the prefilter O ring and all of the new fuel line O rings. Tomorrow I hope to tackle the delivery valve O rings.

Hope this helps someone not make extra work for himself. I was kind of wondering why it seemed like I was the only one who seemed to have a leak at that gasket. I still haven't found the real leak, but I'm replacing everything, so that ought to fix it.
Attached Thumbnails
606 engine fuel pump leak-fuel-pump-location.jpg   606 engine fuel pump leak-fuel-pump-gasket.jpg   606 engine fuel pump leak-fuel-pump.jpg  
__________________


Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - being parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 216,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 17,000 miles
'14 Smart electric cabriolet 10,000 miles
Reply With Quote
  #2  
Old 05-23-2007, 05:42 PM
BigBen's Avatar
Registered User
 
Join Date: Oct 2004
Location: Montreal, Canada
Posts: 156
Interesting that you gave so much details about your problem. I am attempting this job in the coming days since I have a smell of fresh unburned diesel when walking around the hood area. I will remove the intake manifold for the first time on the 1998. Done it once on the 1992. I have also ordered everything (fuel lines, o-rings, fuel filter etc...) but not the fuel pump (primer pump) gasket...

Hope you have solved your problem at least. Thanks for the infos,

Bye,
__________________
BigBen

'98 E300 Turbodiesel 244 000km
RIP '92 300D 2,5 Turbo 632 859,4km due to engine failure
Reply With Quote
  #3  
Old 05-23-2007, 05:53 PM
Parrot of Doom's Avatar
1997 W210 E300TD 243,000
 
Join Date: Mar 2006
Location: Manchester, UK
Posts: 983
Ben, when you remove the manifold its well worth replacing the O-ring at the bottom of the EGR valve. Very cheap part, but difficult to get to without removing that manifold. Also get some engine degreaser and a bottle brush, and scrub that manifold out

One of those jobs that you should do 'while you're in there' so to speak.
Reply With Quote
  #4  
Old 05-23-2007, 06:05 PM
Registered User
 
Join Date: Jul 2003
Location: Ocean Isle Beach, NC
Posts: 2,437
Ben - I'd say that if you aren't seeing black engine oil leaking from the fuel pump, then leave it alone. Lesson learned.
__________________


Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - being parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 216,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 17,000 miles
'14 Smart electric cabriolet 10,000 miles
Reply With Quote
  #5  
Old 05-23-2007, 06:06 PM
Jadavis's Avatar
Registered User
 
Join Date: Oct 2005
Location: Tennessee
Posts: 995
So the viton o-rings I sent you all worked just fine? Let me know how the rest of them go.

-Jim
(http://www.fryerpower.com/store/page11.html)
__________________
1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.
Reply With Quote
  #6  
Old 05-23-2007, 06:17 PM
iamamanc
Guest
 
Posts: n/a
Ben
You have a 606 - have you taken the plastic cover off the top of the engine and checked the injector fuel return lines. If they are old they could be weeping fuel which puddles in the injector recess.
Cheers
Adrian
Reply With Quote
  #7  
Old 05-23-2007, 06:29 PM
Registered User
 
Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
Posts: 4,874
Good ol Len, charting the uncharted for the rest of us.

Glad you figured the fuel pump mystery out. Hopefully one of the two fuel lines that connect to it were the real culprit and the new viton o-rings will resolve it.

JADAVIS - I gave you all the sizes. They ARE correct. You're a worry wart.
__________________
Terry Allison
N. Calif. & S. of Key West

09' E320 Bluetec 77k
Reply With Quote
  #8  
Old 05-23-2007, 07:12 PM
Jadavis's Avatar
Registered User
 
Join Date: Oct 2005
Location: Tennessee
Posts: 995
Quote:
Originally Posted by TMAllison View Post
JADAVIS - I gave you all the sizes. They ARE correct. You're a worry wart.
Yes, yes I am. Especially when I don't get to hold them in my hands and check them myself! (It's kind of a customer service thing. When I buy things for myself I would expect them to be right. Since I am selling them I want them to be right.)

-Jim
__________________
1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.
Reply With Quote
  #9  
Old 05-23-2007, 07:41 PM
Registered User
 
Join Date: Jul 2003
Location: Ocean Isle Beach, NC
Posts: 2,437
Jim - so far so good on the O rings. I think there was one too many of the 2.5 x 8mm ones for the fuel lines unless there is somewhere else one of them goes that I haven't come to yet. Used the one on the prefilter and the shut off valve and they were fine.

Terry - I obviously missed the source of the leak and I thought I checked very closely. From the location of the wetness, I'm moving the leak from the gasket now to one of those two fuel lines you suggest.
__________________


Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - being parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 216,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 17,000 miles
'14 Smart electric cabriolet 10,000 miles
Reply With Quote
  #10  
Old 05-23-2007, 07:42 PM
Registered User
 
Join Date: Jul 2003
Location: Northern Virginia
Posts: 1,070
get a torque wrench

I don't see your torque wrench in the picture. Please tell us that you are planning to use a good one and that you promise not torque steel bolts into aluminum threads more than 10nm. I want to follow your progress and don't want to hear that you overtightened something. Your fuel leak will pale next to a stripped bolt hole. Seriously.
__________________
2009 E320 Bluetec 108,000
1995 E300D 306,000 sold
1996 Ford Taurus LX 130,000 Sold
1985 300TD Still 225,000
2016 Ford Fusion 14,900
Reply With Quote
  #11  
Old 05-23-2007, 10:02 PM
BigBen's Avatar
Registered User
 
Join Date: Oct 2004
Location: Montreal, Canada
Posts: 156
Quote:
Originally Posted by connerm View Post
I don't see your torque wrench in the picture. Please tell us that you are planning to use a good one and that you promise not torque steel bolts into aluminum threads more than 10nm. I want to follow your progress and don't want to hear that you overtightened something. Your fuel leak will pale next to a stripped bolt hole. Seriously.
As I said earlier, I've just started to remove the manifold. And believe it or not, I have two bolts that won't come off. They actually unscrew a good two full turns, but really jam after that!

They don't look cross threaded though, but I've left them there for tonight.

I found a badly leaking return line underneath the black "valve" cover. I had already planned to change them all. I expect DHL to drop the parts in tomorrow. And yes, that big O-ring for EGR is in the order.

I will wait until this fall to do the steel fuel lines, glow plugs, pressure delivery valve seals and possibly injectors.

Removing the intake wouldn't be that bad of a job after all. It's just the previous mechanic that worked on it that screwed up by overtightenning these two screws.

So Connerm, you couldn't say better!

Would it be a good idea to use never cease?

Bye,
__________________
BigBen

'98 E300 Turbodiesel 244 000km
RIP '92 300D 2,5 Turbo 632 859,4km due to engine failure
Reply With Quote
  #12  
Old 05-23-2007, 10:05 PM
BigBen's Avatar
Registered User
 
Join Date: Oct 2004
Location: Montreal, Canada
Posts: 156
And by the way, what is the cure for a stripped bolt hole?

I recal about heli-coil or something like that... would that be the way to go?

Thanks,
__________________
BigBen

'98 E300 Turbodiesel 244 000km
RIP '92 300D 2,5 Turbo 632 859,4km due to engine failure
Reply With Quote
  #13  
Old 05-23-2007, 10:11 PM
Registered User
 
Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
Posts: 4,874
Big Ben - The intake manifold cap bolts are to be torqued to 20NM starting from the center and moving to left and right thirds. Anti sieze is a lubricant, like putting oil or grease on a bolt and can result in less resistance and increased torque when reinstalled. MB didnt use it, I wouldnt (and didnt) either.

Go hit the tight ones with PB Blaster or WD40 now and let them sit overnight then try again.
__________________
Terry Allison
N. Calif. & S. of Key West

09' E320 Bluetec 77k
Reply With Quote
  #14  
Old 05-24-2007, 02:34 PM
BigBen's Avatar
Registered User
 
Join Date: Oct 2004
Location: Montreal, Canada
Posts: 156
TMAllison

I got one out after hammering on it when it was fully tightenned.

The other one came out about 4/5th, but the bold head snapped right off (broke), so I'm left with a stud in place... see what I mean?

I may just put a nut on the sucker.

And I will have a torque wrench on hand when I finish the job!

Got all the parts delivered.

Bought the parts from MB Canada. The o-rings on the hose fittings: are they Viton automatically these days? They are black, just like "regular" o-rings.

Thanks,
__________________
BigBen

'98 E300 Turbodiesel 244 000km
RIP '92 300D 2,5 Turbo 632 859,4km due to engine failure
Reply With Quote
  #15  
Old 05-24-2007, 02:38 PM
Registered User
 
Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
Posts: 4,874
Put two nuts on it and remove using the jam nut.

Soak it too
__________________
Terry Allison
N. Calif. & S. of Key West

09' E320 Bluetec 77k
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 10:43 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page