White smoke is unburned fuel, or water. Since it goes away after a
couple min. it is 90% liklihood to be unburned fuel. That indicates
either low compression, or bad glow plugs or the oddball things, bad
nozzle, broken prechamber tip, bad headgasket between the two cyl. or
the like.
Compression tests are always suspect. on the iron head Diesels,
valve adjustment is first. Even if you are sure it is right, check
it. Compression should be checked with the engine warm, after a
good italian tuneup. Repeatability is the key. I want to see
virtually identical results at least 3 times. A cyl leakdown test is
more indicative, as it will show WHERE the compression is leaking.
If you have an old injector nozzle holder and an old injector line,
you can make a rudimentary CLT. take out the nozzle from the holder,
and remove the pintle, and reassemble. This will allow air from the
top to the outlet of the nozzle. Cut off an old injector line and
put one piece on the nozzle holder. Attach an air hose to the other
end of the line.
take out one nozzle from the engine, install the CLT, apply air, and
listen to the intake (air cleaner removed) the exhaust pipe (at the
back) and the crankcase breather tube for airflow. If you test the
good cyls first, you will get an idea for "normal." Higher
airflows on the weak cyl will tell you if which valve or if the rings
are leaking. It is not as precise as a Sun CLT, but you can
accomplish the same, except the % leakage.
Before you do a CLT, be sure to have new nozzle seals on hand. They
are single use.
White smoke is unburnt fuel. Check the glow plugs. Even if one or
two are bad, the light may not indicate it. I had the same problem
recently. Rusty will price match whoever has the lowest price.
Currently that is Rock Auto. Buy all five, I had two bad ones, and
another went bad a week later. Marshall liked Beru plugs, Rusty can
probably get those too, but they won't be cheap.
Rick
Sent from my iPhone.
On Feb 16, 2012, at 5:28 PM, "glenn brown" <g_010...@hotmail.com> wrote:
> I've posted a query about this previously but didn't obtain much
to look for regarding my '85 300TD rough idle and serious smoking
(white) upon cold startup. After ~ 2 min. warmup, the idle smooths
out and the smoking ceases.
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