From: G Shaw (milspectruck@verizon.net)
Date: Thu Oct 27 2005 - 06:49:23 PDT
Hi Caleb
Just as I thought when I heard the description of the noise going along with
the rest of the symptoms. That's why I said go after the valves first. I
would use the red locktite on those bolts now that they have been running
loose to make sure that the possiblility of thread damage does not prevent
the bolts from staying tight on your rockers. The DDA 6.2 can be rebuilt by
the way just like any other engine to the point where the max is reached on
oversize bores. As far as the vib, that engine has a characteristic
harmonic vibration that can be noticed when you run the rpms up through 2-3K
with no load. That is nothing to worry about. But be SURE that your
harmonic balancer looks OK. The rubber dies on them and this can cause a
much larger vibration as well as severe damage if it is let go. They are
cheap and easy to replace if it is bad. Take a look at it as the engine is
running and you should not see any wobble or run out.
Regards
Glenn
-----Original Message-----
From: Military Vehicles Mailing List [mailto:mil-veh@mil-veh.org] On Behalf
Of Caleb Pal
Sent: Wednesday, October 26, 2005 9:00 PM
To: Military Vehicles Mailing List
Subject: Re: [MV] Urgent: CUCV Smoking UPDATE - FIXED
Hey guys,
Well its all fixed. Long story. I called the mechanic yesterday, and he said
the rings were bad. He said he did a leak down and that was the results, air
coming out the crankcase. He taped both the intake and the exaust. I think
this may have provided false results. Anyways, when I was talking to him, I
asked him how long it would take to pull the valve cover. He said 2 hrs. I
asked him to do it. He refused, and said the leak down told him everything
he needed to know. I was very fustrated, as a leak down and compression test
took him a week and a half. He said it would need a new long block or short
block. I thought "BS" in my head, and went down there late last night after
my night class, and pulled the valve cover. Took me and a friend about an
hour. As soon as I got it off, I nooticed something. The shaft that the rear
4 rockers rock on, the tube that goes down the middle of the head, is held
in by 2 bolts. The bolt near the rear, or #7 piston, the one that had lost
compression, was loose. The bolt had worked itself out, and was cauing this
metal tube to bounce up and down and cause the clicking noise I heard. This
made the valves on #7 not work correctly. I tightened it, hooked the
injector lines back up, and it ran fine. I left the valve cover off, drove a
very short distance to the fire station I live at, and put a new valve cover
gasket on. Put everything back together, and a few things happened. First,
it seems to be fine. I seemed to get rid of a slight tick I have had for
almost a year, I think. Second, it sounds like its running nice, with a nice
rumble at higher RPM's. This seems to cause a very slight high speed
vibration, at higher RPM's. I am not sure if this it good or bad. I have a
feeling it might have been loose for a very long time, and when it broke
down, the bolt finally loosened itself enough to cause major troubles. I
will let you guys know how it turns out in the next few weeks. Second, I
drove it back to shop last night, parked it, and this morning came in and
told them I was taking it somewhere else, and wanted to settle up. $242 for
a compression check and a leak down. And a false diag. I was not happy. They
did not know I had fixed it. I waited till the service manager got back, and
explained everything that had happened. He immediately dropped all service
charges. So that fiasco is over. A big thanks to everyone on the list who
helped out!
Caleb
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