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 12-04-2006, 05:04 PM
Registered User
 
Join Date: Nov 2006
Posts: 200
'87 300SDL...leaky injectors

I've got some fuel leaking at what looks to be the base of several injectors. Return lines not leaking and injector nozzles are tight. Injector connection to engine different on this '87 300SDL than on earlier 300SD as connectors to engine appear to be multi sided serated nuts plus hold down clamps.

Any body shed any light on this injector attachment system and how I should proceed? thanks,

wjob

'80 300SD
'82 300D
'86 300SDL
'87 300SDL

Reply With Quote
  #2  
Old 12-04-2006, 05:28 PM
Registered User
 
Join Date: Oct 2006
Posts: 65
The actual injectors or from the fittings coming off of the injection pump? Mine was the latter. New delivery valve o rings will do the job.
Reply With Quote
  #3  
Old 12-04-2006, 05:56 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
The most likely culprit in the area you describe are the return lines. The other possibilites are the injector body (very rare) or the fitting where the hard line connects to the injector (also rare but not impossible).

You'll need to get out the TP and thoroughly dry the area and then seek out the exact source of the leak.
Reply With Quote
  #4  
Old 12-04-2006, 06:33 PM
Registered User
 
Join Date: Nov 2006
Posts: 200
300SDL...leaky injectors

Brian, what's the TP? thanks
Reply With Quote
  #5  
Old 12-04-2006, 06:44 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by wjob View Post
Brian, what's the TP? thanks
.............toilet paper...........
Reply With Quote
  #6  
Old 12-04-2006, 07:02 PM
MathewHennessy's Avatar
Registered User
 
Join Date: Jun 2006
Posts: 46
Quote:
Originally Posted by turbodeezl View Post
The actual injectors or from the fittings coming off of the injection pump? Mine was the latter. New delivery valve o rings will do the job.
I had this problem too.

I'm pretty suspicious of ULSD to be quite honest.
Reply With Quote
  #7  
Old 12-04-2006, 07:59 PM
dieseldiehard's Avatar
Dieseldiehard
 
Join Date: Oct 2002
Location: Bay Area No Calif.
Posts: 4,287
wHunter's list of DIY on IP delivery nozzle repair
For some reason clicking on the Wikka by jbach36 leaves this message:
"You don't have write access to this page. You might need to register an account to be able to edit this page."
Leaking Diesel Pump
__________________
'00 E320 (wifes car), '95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!

Last edited by whunter; 07-14-2007 at 04:47 PM.
Reply With Quote
  #8  
Old 12-04-2006, 09:55 PM
carnut's Avatar
Registered User
 
Join Date: Jul 2006
Location: Stockton California
Posts: 637
I'll bet its the return hoses! I fought this for 2 weeks on one injector. I finally replaced the hoses with MB light brown return hose and leak fixed. I've also seen nicks/scratches on the nipple of the injector caused by box cutters or razor blades cutting thru the old hose during replacement. I've had good luck using emery cloth on the nipple to smooth it out. Some guys swear by rubber fuel hose but I have never tried it. Do a "search" for injector leak on the forum.
__________________
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
Reply With Quote
  #9  
Old 12-05-2006, 12:09 AM
Hatterasguy's Avatar
Zero
 
Join Date: Nov 2002
Location: Milford, CT
Posts: 19,306
Replace the return lines, then clean the top of the engine with Gunk or Simple Green. 90% chance its the return lines.
__________________
2017 Chevy Silverado 1500 LTZ
2007 Tiara 3200

"No free man shall ever be debarred the use of arms. The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government."
-Thomas Jefferson
Reply With Quote
  #10  
Old 12-05-2006, 01:45 AM
nhodges's Avatar
Registered User
 
Join Date: Nov 2001
Location: Northern VA
Posts: 461
leaky inj pump

Quote:
Originally Posted by dieseldiehard View Post
Bill Hunter's list of DIY on IP delivery nozzle repair
For some reason clicking on the Wikka by jbach36 leaves this message:
"You don't have write access to this page. You might need to register an account to be able to edit this page."
Leaking Diesel Pump


Click on the line "view coding for this page" and the DIY info will come up.
__________________
N. Hodges
1994 S350
1987 300 SDL (for sale)
Reply With Quote
  #11  
Old 12-05-2006, 02:06 AM
Jadavis's Avatar
Registered User
 
Join Date: Oct 2005
Location: Tennessee
Posts: 995
Phil has the OEM style injector lines on this site.

I have the viton tubing return lines on my website, www.fryerpower.com.

I went with viton since it can handle ULSD, WVO, or Biodiesel.

The OEM style lines should be good for ULSD. They may need to be replaced more often, but they will work fine.

-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
  #12  
Old 12-05-2006, 02:25 PM
Registered User
 
Join Date: Nov 2006
Posts: 200
'87 300SDL...leaky injectors

Correction! Correction! My leak is at the base of the injection pump nozzles, not those on the engine.

So, how should I proceed and if I do need to remove injectors at IP how should I proceed? Nozzles are tight so leak is at bottom of injector where it goes into pump. Injector connectors to IP appear to be multi sided serated nuts plus hold down clamps. How do I remove?

Also you will see from my post 11-13-06 under thread, '87 300 SDL...no power, that that is still my main problem and that in the course of solving it I saw this IP fuel leak. Could this leak from what appears to be at least two injectors be my power problem? I also have a leaky main return hose from the spin on filter gong back (about 15 inches) to the metal line to the tank. Planning to replace it with rubber fuel line rather than braided type from MB? Also may use biodiesel in future so rubber and/or braided may not be best choice?

Since my last post on the power problem I have by passed the overload switch and temporairly inserted a pressure gauge and my boost pressure on the road, pedal to the metal, is only about 3/4 pounds. With this by pass, it helps power problem a little bit (very little) so guess this tells me to flush out overload switch before I reconnect.

Next steps I'm Planning: Repair leaky IP injectors and leaky return line; then run on separate fuel supply to eliminate a supply problem (assume for this test that I can leave return go back to my regular tank?); then run diesel cleaner through spin on filter to clean out any possible junk in IP; then discoonect and plug vacum line going to EGR; then, if necessary remove plug in exhaust manifold to see if my problem is in the exhaust; then if still a problem start dissasembing turbo.

Thoughts and suggestions please!

wjob

'80 300SD
'82 300D
'86 300SDL
'87 300SDL
Reply With Quote
  #13  
Old 12-05-2006, 02:39 PM
Registered User
 
Join Date: Oct 2006
Posts: 65
Like I said, fuel is leaking from the injection pump nozzles , meaning you need new delivery valve o rings. If you do not have the special socket you can use one of the hold down clamps on each nozzle and carefully tap it until the nozzle loosens enough to turn the clamp by hand. Be very careful to pull the nozzle straight up as there is a free sitting spring which the nozzle sits over.
Reply With Quote
  #14  
Old 12-05-2006, 02:51 PM
Registered User
 
Join Date: Aug 2006
Posts: 95
That's a great idea I've been trying to find the socket. Have you tightened the valves back with this method. By the way I'm in the middle of doing this now and have another post asking for advice regarding the injectors which are stuck.
Reply With Quote
  #15  
Old 12-05-2006, 03:26 PM
Registered User
 
Join Date: Nov 2006
Posts: 200
'87 300SDL...leaky injectors

-Since I may go to biodiesel sometime what o ring material should I buy? -
-How many orings for each nozzle?
-Would this leak be a cause of my low power problem?
-Where can I get the special socket?
-Assume I slightly losen the clamp before taping on it?
-When putting the nozzles back in without the special socket assume I just take up finger tight (is that tight enough or should I use little pressure with lock pliers?) and then tightly fasten the hold down clamps?
-Anybody have a cutway of the IP and IP nozzles?
-If I find the socket anybody know the proper torque setting?

thanks

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 05:38 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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