[diesel_mercedes] Re: Newbie question #56 1978 300D fuel pump

 

    Posted by: "rkitt2002" rkitt@netscape.com rkitt2002
    Date: Sun Sep 11, 2011 7:59 pm ((PDT))

Hello All

My 1978 300D (non turbo) is not running.
 
Running used oil is nasty but should work.  Disconnect your fuel return line
crank and check for flow.  You should get some.  Check the glow plugs.  Air in
the lines usually is what my problem is.  Make sure every clamp is tight.  Use
the primer pump to get air out of the system.  100 strokes should do it.  If my
glow plugs are good that usually gets it started for a while.  Also take off
the secondary and check the primary fuel filters.  The secondary screw on should
be full of fuel.  It should also be free blowing.  I know this is gross but if
you can't pass air through it it is bad.  Any resistance means it is clogged. 
 Good luck.  Lawrence Rhodes...

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Re: [diesel_mercedes] Re: Floor vent vacuum controller 84 300D

 

My apologies, Jim.  On the later system, the servo is more correctly called a "monovalve", so use that term in the search.  Here's a posting that may sound familiar:

http://autos.groups.yahoo.com/group/diesel_mercedes/message/54663

I'm not sure just where it is on the later cars.  The servo used in the old Klima I system was located on in the right (passenger) front of the engine compartment, mounted on the fender outside of the A/C compressor.  I think the later system had it mounted on the firewall.  Here's an article for the W126:

http://mbz.org/articles/hvac/plumbing/monovalve/

If your door locks are working all right, then your vacuum system is not causing your climate control problems, though you may have a problem with the shut-off diaphragm on the injector pump, or a leak at the key switch.

Mark in Lakewood, CO
From: "n61cm" <jim@tazwade.com>
To: "diesel mercedes" <diesel_mercedes@yahoogroups.com>
Sent: Sunday, September 11, 2011 1:30:32 PM
Subject: [diesel_mercedes] Re: Floor vent vacuum controller 84 300D

 

Door locks seem fine. What part is the servo and where is it located? I searched for it but can't find it in the archives.

Jim

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