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 ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 04-08-2002, 06:24 PM
Sfk35
Guest
 
Posts: n/a
1975 240D How to Replace Diaphram on Injection Pump?

Help! I posted a problem last month, 1975 Mercedees 240D, where the engine idles Ok, and goes fast Ok, but otherwise the engive revs up and down. (it also smokes super bad when started untill it warms up).
Unfortunately, only got one response but was greatfull for that.
I order the diaphram part for the fuel injection and started to take off first the first part with the 4 screws so that I can see the diaphram. It actually looked OK but have since ripped it while trying to pull it out to get to the pin that holds the diaphram on.

Question: I can see the snap clip that holds the pin onto the diaphram but no way to get my fingers in the hole to get it off (without removing the next whole plate that covers the injection pump.) I started to remove this large plate but diesel is dripping out.

Is there any way to get the diaphram rod out without taking off that wide plate? (it covers most of the back side of the injection pump) (note: also one screw head that holds the wide plate is stripped and can't get it out).
I have the mercedees manual but it doesn't show me much detail and instructions are vague. I was told this should be 1.5 hr. job but the screws have been on so unbelievably tight and can't get channel locks on it.

Can I somehow get the whole rod out with the diaphram?
Can I get a fax copy of what this looks like?
What else would cause my engine to rev up and down?
Reply With Quote
  #2  
Old 04-08-2002, 06:38 PM
Registered User
 
Join Date: Oct 2001
Location: Seattle Area
Posts: 373
sfk, I haven't replaced the IP diapgram in any of my cars so can't help there, but I have suggestion for the erratic idle (it is only revving when sitting at idle right?)

In my W123 (can't remember in my old W115) the idle will surge when I leave the 'idle-speed' switch on the dash in the far-right (starting-only) position. Try playing around with that first by backing off the starting position. When my car has run funny in past, I could always tweak the switch to lower/raise the idle to a point where it was smooth.

As for smoking at start up, it may be your diaphram in addition to the IP timing. I've replaced just about everything there is in the fuel delivery/filtering system in my W123 and it still smokes on cold start and even at idle after warming up. As I understand from several sources - the IP timing is the likely culprit - make sure and get the IP timing set properly after getting the new diaphram in. It could be one, or any combination of the above items.

Good luck,
- Ryan
__________________
'95 E420 - 'Shadowfax' 138kmi.
'92 Volvo 740Turbo Bard 193kmi
'74 240D - 'Ol' Green' 4spd Manual 104kmi. (sold )
'77 300D - 'Red' 223kmi (sold)
'75 240D - 'Bianca the Blue Bomber' (sold)
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Is my injection pump going bad? Scott98 Diesel Discussion 7 12-28-2004 10:49 AM
can U replace diaphram w/o removing pump angst Diesel Discussion 5 02-11-2004 10:36 AM
Timing the injection Pump on a 1986 190D 2.5 MCLARENF1 Tech Help 6 08-02-2002 05:20 PM
Injection pump timing on MB 190D 2.5 1986 MCLARENF1 Diesel Discussion 1 08-02-2002 07:01 AM
Injection pump differences turboserif Tech Help 0 08-16-2001 08:06 PM



All times are GMT -4. The time now is 12:30 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page