Max Dillon via Mercedes <mailto:mercedes@okiebenz.com>
March 16, 2017 at 4:58 PM
I took a long hard look in each pre-chamber, nothing amiss that I
could see. After cleaning up #1 & #2, with all injectors out, I
cranked the engine through a few revolutions to blast out any junk
that might have fallen in.
Easy / cheap to try swapping out the DVs, compared to procuring and
swapping an injection pump.
Curley McLain <mailto:126die...@gmail.com>
March 16, 2017 at 9:05 AM
With the nozzle holder and heat shield out, you can visually inspect
the prechambers, except the 6 holes in the tip. With a small catheter
cam, you should be able to see the holes in the end, you just have to
get around the ball in the prechamber.
I think the next step (other than Kle'bs suggestion) is #3.
Meade Dillon via Mercedes <mailto:mercedes@okiebenz.com>
March 16, 2017 at 7:53 AM
Status update
Timing has been corrected, didn't help.
Turbo boost restored to ~14 psi, and that helped to resolve a lot of
the problem. Smoke is gone, but the nailing persists.
Correct glow plugs installed, didn't help.
Injectors with new Monark nozzles installed tonight, and if anything
the problem is worse. :\
I may need to find a new mechanic. The fellow who installed the
injectors FAILED to put heat shields under #1 and #2!!! What a
looser! When I found this I thought "Ahh HAH!! This is it!" but alas
I don't see the improvement I was expecting. Perhaps there is
excessive carbon build up in those two pre-chambers, and I've got to
burn that out?
I can think of three more things to try:
(1) Rebuild the delivery valves (DVs) again.
(2) Swap all the DVs with a "known good" used set, from the original pump.
(3) Replace the injection pump.
I don't think compression is the issue, the car started just fine at
28 deg F this a.m., and per normal it idles smoothly for a few seconds
while the glow plugs are hot, and then it starts to miss.
-Max
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Karl Wittnebel via Mercedes <mailto:mercedes@okiebenz.com>
January 15, 2017 at 12:58 PM
Maybe a compression check?
Maybe an egt monitor or Afr sensor in the tailpipe to get a sense of the
mix.
Or just turn the boost up and see how it goes.
On Jan 15, 2017 10:10 AM, "Meade Dillon via Mercedes"
<mercedes@okiebenz.com>
wrote:
Dieselvolk,
Here's the situation: My 124.193, with 365k miles, isn't running well at
all. Under anything more than gentle throttle, the engine pings and
smokes. Mileage is bad, around 22 mpg in town, about 25 on the highway. I
used to get about 26 in town, 28 on the highway. Starts fine, idles fine.
A diesel-purge treatment will clear it right up, and it will run just fine
(and get better mileage) for about a month, and then it declines back to
poor running. Italian tune-ups will also help a bit (especially with the
smoking).
What changed? I installed an injection pump from a 3.5 liter engine. One
of the three hold-down tangs on the original IP broke (long story) so
I had
to replace it, and I had this 3.5 liter IP on the shelf.
When I installed this "new" IP, I overhauled the delivery valves, and
adjusted the ALDA 1/2 turn richer. I have since moved the ALDA screw back
to the original position, I think, I need to check the records. I may have
only moved it back 1/4 turn.
What else is wrong? I have the wrong glow plugs installed. When I
installed the "new" head a few years ago (with oblique injection) I
swapped
in the relatively new glow plugs from the original head. Oblique injection
heads use a glow plug that is shorter.
Last weekend I adjusted the timing (it was a couple degrees advanced), and
then went on a 900 mile highway trip for work. No change in performance.
I think that this bigger pump is over-fueling the engine, resulting in
lots
of un-burned fuel and carbon build up.
Options that I can think of:
1) Back off the ALDA screw a little more.
2) Install the correct glow plugs.
3) Check the turbo output, bump it back up if low.
4) Remove the 3.5 liter injection pump, put a 3.0 liter IP back in
(Wilton's old 300D engine has one)
5) Pull the engine and tranny, swap in engine / tranny from Wilton's 300D.
This is attractive because my engine has a nagging oil leak that I haven't
been able to solve, plus that engine / tranny are much younger, only 143k
miles. The downside is that engine still has the original #14 head, but
that is minor (I think the head is sound).
-------------
Max
Charleston SC
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Meade Dillon via Mercedes <mailto:mercedes@okiebenz.com>
January 15, 2017 at 12:09 PM
Dieselvolk,
Here's the situation: My 124.193, with 365k miles, isn't running well at
all. Under anything more than gentle throttle, the engine pings and
smokes. Mileage is bad, around 22 mpg in town, about 25 on the highway. I
used to get about 26 in town, 28 on the highway. Starts fine, idles fine.
A diesel-purge treatment will clear it right up, and it will run just fine
(and get better mileage) for about a month, and then it declines back to
poor running. Italian tune-ups will also help a bit (especially with the
smoking).
What changed? I installed an injection pump from a 3.5 liter engine. One
of the three hold-down tangs on the original IP broke (long story) so
I had
to replace it, and I had this 3.5 liter IP on the shelf.
When I installed this "new" IP, I overhauled the delivery valves, and
adjusted the ALDA 1/2 turn richer. I have since moved the ALDA screw back
to the original position, I think, I need to check the records. I may have
only moved it back 1/4 turn.
What else is wrong? I have the wrong glow plugs installed. When I
installed the "new" head a few years ago (with oblique injection) I
swapped
in the relatively new glow plugs from the original head. Oblique injection
heads use a glow plug that is shorter.
Last weekend I adjusted the timing (it was a couple degrees advanced), and
then went on a 900 mile highway trip for work. No change in performance.
I think that this bigger pump is over-fueling the engine, resulting in
lots
of un-burned fuel and carbon build up.
Options that I can think of:
1) Back off the ALDA screw a little more.
2) Install the correct glow plugs.
3) Check the turbo output, bump it back up if low.
4) Remove the 3.5 liter injection pump, put a 3.0 liter IP back in
(Wilton's old 300D engine has one)
5) Pull the engine and tranny, swap in engine / tranny from Wilton's 300D.
This is attractive because my engine has a nagging oil leak that I haven't
been able to solve, plus that engine / tranny are much younger, only 143k
miles. The downside is that engine still has the original #14 head, but
that is minor (I think the head is sound).
-------------
Max
Charleston SC
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