Diesel RVs: [diesel_mercedes] IP pump outlet construction question [1 Attachment]

[Attachment(s) from Bogy Wan Kenobi included below]

I took the outlet off and have som MEK to clean the bits with. But the question arises - should there be an oring in the grove around the valve seat. See attached pic.

"Hardware eventually fails.
Software eventually works"
                - Michael Hartung

--------------------------------------------
On Mon, 8/1/16, vwnate1@yahoo.com [diesel_mercedes] <diesel_mercedes@yahoogroups.com> wrote:

Subject: Re: [diesel_mercedes] Loping OM616 injection pump test video
To: diesel_mercedes@yahoogroups.com
Date: Monday, August 1, 2016, 10:13 AM

Just so Bogy ;

It can have a lot of crud in there gumming
things up plus water drops too big to allow the passage of
fuel ~ I found both plus rust , I *think* the rust may have
precluded the valve from working properly .

The steel pipe is a red
herring ~ if the cylinder gets sufficient fuel to run off
idle , it's passing plenty of fuel and isn't blocked
.

I was told the discharge
volume is the primary change made when fiddling with the
13MM nuts and plate .

Timing is critical too .

Maybe Brian can find you a used 616 IP *BUT* I
recently tried chattnig up a fellow who was removing the IP
from an '85 300D , he was fairly pleasant but made it
clear he had NO IDEA how to check for a good used pump and
was only taking it to re sell on E-Bay so CAVEAT EMPTOR !
.

BTW : I too prefer to
learn thed hows and why's of things before making
repairs , most of the time when I mention teaching myself it
means I already have several spares , all the Tech info and
books I can find plus lots of discussions under my belt .

Knowledge is worthless unless
shared .

-Nate
Bogy   wrote :

Nate:

Are you then suggesting, possibly, that
perhaps the check valve is not seating properly? What else
could be wrong inside there. Forgive me, but it is my nature
to want to know WHY something is the way it is - not just
WHAT to do or not do. By the way, I can get fuel to move
down the line to bleed the line when reassembling. So there
is fuel moving out toward the injector when the line is
"open" or "cracked open" at the end, but
not when the injector is tightly attached.

It's too late for me to not touch the 13mm
ATF nuts. That is how I equalize fuel delivery on a per
stroke basis between the outlets. 5-6 revolutions of the
shaft produces less than 1 mm of difference in the height of
the fuel (in clear plastic pipes 3mm in diameter) across all
four outlets by rotating these outlets. I know it affects
the injection timing too. so what is more important - exact
timing or amount of fuel delivered?

I have had 2 new intake
screens on this rig in the last 400 miles. I have also taken
off the tank and cleaned it out thoroughly. There was a
trace of water in it and some of that was getting into the
intake screen and even the main filter. I always pour out
the contents of my fuel filters when I change them. Amazing
how much water can be in the bottom of those things. That is
why I pulled and cleaned the tank - I noticed some water in
the clear intake screen.

Otherwise thanks for the hope
that it is only a dirty or faulty outlet part.

Bogy.

"Hardware eventually fails. Software eventually
works"    - Michael
Hartung

From: "vwnate1@...
[diesel_mercedes]" <diesel_mercedes@yahoogroups.com>
To: diesel_mercedes@yahoogroups.com

Sent: Sunday, July 31, 2016 7:44 AM

Subject: [diesel_mercedes] Loping OM616
injection pump test video

Very good Bogy ;

Now , remove the # 4 injector
pipe from the IP and using a 15 MM six point deep socket ,
remove the delivery valve and swab down in the open hole
with clean Q-Tips and some brake cleaner or engine starting
fluid ~ the amount of crud and tiny water drops I found in
my worn out IP amazed me .

The elements in the delivery valve were also
rusty (!) before I found good one , I made do my wire
brushing them well before washing HOSPITAL CLEAN then re
assembling .

DO NOT touch
the two 13MM ATF nuts on the top of the IP !! .

Failures like this are why
Mercedes wants you to use a CLEAR PLASTIC fuel intake screen
.

Change it ASAP , Auto
Zone and Pep Boys both stock the correct clear plastic
version .

-Nate
   Bogy   wrote
:

Let's see if this
works.

"Hardware
eventually fails. Software eventually works"
   - Michael Hartung