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 03-19-2010, 09:08 AM
Registered User
 
Join Date: Aug 2005
Location: Cordova,TN
Posts: 140
IP delivery valve

Has anyone had any experiences w/ blockages in the delivery valves? Still trying to track down possible missing and hard starts, just wondering what symptoms would be?

1985 300sd

Reply With Quote
  #2  
Old 03-19-2010, 10:45 AM
Registered User
 
Join Date: Nov 2004
Location: Nova Scotia, Canada.
Posts: 6,510
If the delivery valve will not seat may have been encountered by a poster reciently. You would see less coming out one of the injector hard lines was his initial observation. You canot jump to conclusions that it is a problem with out some real indication. You have to swap injectors etc first.

Most problems will be fuel supply related for your issues. Do you have a good flow of fuel with no air entrained flowing out your return line with the engine running? You also may have an air leak somewhere that lets the fuel return to the tank. This will result in harder starts and missing as well.

Just take a line from the return valve on the injection pump. Submerge the line in fuel or any liquid. Watch for the level to increase and no bubbles once the line has been purged with the fuel. That is a starting point. It has to pass this test first of all to move on..

Last edited by barry123400; 03-19-2010 at 11:04 AM.
Reply With Quote
  #3  
Old 03-19-2010, 10:55 AM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,346
Quote:
Originally Posted by mhin1956 View Post
Has anyone had any experiences w/ blockages in the delivery valves? Still trying to track down possible missing and hard starts, just wondering what symptoms would be?

1985 300sd
It's quite possible. Easy enough to take them apart and clean.
__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42
Reply With Quote
  #4  
Old 03-20-2010, 01:07 AM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 51,038
I am not exactly sure what you mean by blockage. If the flow is blocked completely the hydraulic pressure is going to seriously ruin something.

As previously stated the Delivery Valve seating area can go bad. I have seen the Delivery Valve Springs break before (on many types of iline IPs).

I have also see rust stick them in the unseated position. Meaning that when the Fuel is Injected the valve goes up but does not return to its seat.

If there is enough water in the IP it can actually rust the Steel parts overnight.

I have seen a similar thing due to old dried out Fuel where the Pump has sat for a long time (even a rebuilt Pump that has sat on the Shelf for several years).

Not related to the Delivery Valves but down below the Plunger/Tappet Return Springs have also been known to break.
On some of the IPs like the M Pumps the part that attaches to the Rack where you adjust the Fuel for each individual Element; have also been know to come loose.
When it comes loose you lose control of the Fuel adjustment on that Element.

The MW Pumps do not have a Cover but the MW Pump and the IPs on the later Engines have a removable cover where you can view the Element Fuel Adjusters on the Rack and you can see the Plunger/Tappet Retun Springs.

__________________
84 300D, 82 Volvo 244Gl Diesel
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 12:57 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page