From: Glenn Shaw (milspectruck@verizon.net)
Date: Sat Mar 18 2006 - 16:20:01 PST
Hi Jim
I would have to rule out the valves and lifters. Your numbers look good.
Occasionally you will see a bad head gasket or a crack in the block or head
that only opens due to thermal change but you have the white smoke of
incomplete combustion cold or warm. I would start to look very seriously at
the injectors and injector pump at this point. Even though they worked
before it could just be that it picked now to die on you. If it was me
and I had already tried 2 different sets of injectors in the left bank as
you stated you had done, I would say it is pointing to problems with the
injection pump.
Regards
Glenn
-----Original Message-----
From: Military Vehicles Mailing List [mailto:mil-veh@mil-veh.org] On Behalf
Of Jim Zehr
Sent: Saturday, March 18, 2006 3:09 PM
To: Military Vehicles Mailing List
Subject: [MV] update from the CUCV 6.2 diesel that was smoking
I filled the radiator and the engine with water this AM,installed the new
thermostat, and let the engine run for 30 minutes with out driving it. I
ran it at various RPMs and idled in between. I let the engine cool for an
hour (not overheated, just time for quick lunch). I was able to purchase a
new compression test tool from NAPA today. The left cylinders are #1, #3,
#5, & #7. The right side is #2, 4, 6, & 8. Compression test done on #1 twice
to make sure. #1 390 & 385, #3 450, #5 440, & #7 400. #2 450, #4 440, #6
435, & #8 430. This was with fully charged batteries and all glow plugs
removed, and 11 to 13 puffs per cylinder (with the wife rolling her eyes the
whole time)(she was the key twister). The military standards are 380 to 400
being the low end. Chevy's standards are 300 being the low end. Both books
say the low cylinder (per side) should not be less than 80% of the highest
cylinder. 80% of 450
(#3) is 360psi which is means my weakest cylinder is
25 psi or so to the better.
I did find that the low pressure fuel return line on
#3 is leaking so I will fix that problem. It seems
that I did not have the little clamp properly
positioned although this has nothing to do with my
smoking problem. I did have a few small bubbles in
the water at first but I beleive that that was from
having freshly filled the engine with water. The cap
was installed and there was no pressure or vacuum
after the 30 or so minutes of running.
The smoke is still there on the left side only and has
no odor and is not steam. Perhaps a sluggish lifter
or slightly burned exhaust valve. I have two freshly overhauled and
pressure tested heads but don't want to do that yet since I don't have the
new head bolts
($120) at this time although I did purchase an
overhaul gasket kit to begin the project.
Any ideas would be most welcome. Time for a big
glass of iced-tea now!
Jim in Louisiana
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