Loren Faeth wrote:
Several of us over the years have encountered slow starts when cold (Below
zero or below freezing cold starts). This is accompanied by clouds of
smoke and rough running and low rpm even whit the pedal floored. In the
case of my SDL, it got worse over time, with the onset at warmer temps
each winter.
I consulted the list and was told to disconnect or cut the purple wire to
the Glow relay to make a low budget afterglow system.
I have been meaning to replace the o-rings on the IP delivery valves for
quite a while.
I finally did the job and wanted to pass on the results.
John W. Reames III <[EMAIL PROTECTED]> did a nice write-up for the 606
engine, and most of it also applies to the 603. Marshall added a caution
to the write-up. I did it without removing the intake manifold, 603. I did
remove the air pipe form the turbo to the intake manifold. Take loose Inj
line clips at the bolts. Push the back 3 lines aside, but don't try to
remove them from the manifold with the unbolted holders still clipped to
the line. The front 3 lines come out with the clip as a unit. Since I
replaced all the plastic clips about a year ago, i didn't want to disturb them.
As per the write-up, I replaced the copper seals, the o-rings and the
Delivery valve springs. I did loose a couple of the old springs on
disassembly, but did not drop any of the new ones. I took out all the
valve bodies, cleaned up the IP top again , and cleaned the valve bodies
after taking off the o-rings. As a matter of habit, I keep everything in
order so it goes back in the same position. Reassembly was easy. I used
the spring to center the valve and the copper ring in the IP body, then
carefully lowered the body over it. I screwed the body in by hand. The
o-rings should seat while turning it in by hand. I then backed it out a
sisth of a turn or so and retightened them a couple of times by hand to
seat the o-rings. I repeated this for each delivery valve.
When they were all in, then I tightened, loosened, tightened, loosened, and
then tightened to final torque. I stayed just below the torque spec. This
procedure is similar for older 4 cyl IP delivery valves.
After getting everything back together and getting the air bled out. it
started and I had no knocks.
THE END RESULT: The car starts instantaneously. No smoking when cold. I
am convinced I can plug the purple wire back in again. This will prolong
the GP life
It is supposed to be getting very cold in the next few nights, So i
will see how it goes.
If you have a 603 and smoking or rough running on low temp cold starts I'd
highly recommend changing the Delivery valve o-rings. I intend to do it on
the TD as soon as I can.
Hope this is helpful
Plan to do trans diagnosis on the 88 TE this weekend.
Your results are interesting, but when I add my result to them, I'm not
sure there is just ONE answer. The delivery valve seals MY be the
primary solution to the poor acceleration right after a cold start
(something I have not experienced in my 300TD)
Over the last few years I have experienced, smoky, slow, rough starting
my 300TD when temperatures were much below 20 (F). It ran fine once
warmed up for 15-30 seconds. I replaced the glow plugs. NO change. I
allowed the plugs to glow for an additional 10-20 seconds. That reduced
(didn't eliminate) the smoke and the engine idled a little more smoothly
at first. Mind you, I had a pair of 4 and 5 cylinder diesels for
comparison and the 601 engines would start on the first compression
stroke, the 602 engines usually on the first or second, both with
minimal smoke and the 603 routinely took 3 or more compression strokes
to start and emitted a dense cloud of white smoke upon starting in
weather at temps below 20. Finally this fall I replaced the 7+ year old
Interstate battery with another Johnson Controls battery (from Advance
Auto). Since then with just 5 seconds additional glow after the dash
lamp extinguishes, the engine starts in below 20 deg F weather on the
first compression stroke and there is little or NO smoke.
Leaving the purple wire off WILL improve cold idle after the engine
starts but it has NO effect on speed of starting or the amount of smoke
ejected when the engine starts. It will reduce the amount of smoke
produced once the engine HAS started.
Marshall
--
Marshall Booth (who doesn't respond to unsigned questions)
"der Dieseling Doktor" [EMAIL PROTECTED]
'87 300TD 182Kmi, '84 190D 2.2 229Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5
turbo 237kmi
