Join Date: Jan 2014
Location: Drexel, Missouri
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Compression Loss Through Intake and Exhaust Valves
Hey guys, I am brand spankin' new to the forum and recently acquired a 2004 6.0 in a Superduty 4x4. The rest is history, as they say . . .
Long story short, I didn't do my homework on the 6.0 before pulling the trigger. Here is it's current condition:
- Seemed to run fine when test drove at night (didn't see the smoke at start up).
- Ran great on the way home (95 miles).
- Next morning noticed greyish-white smoke at start up. Smelled diesel fuel in exhaust.
- Cranking over the engine you can hear the cylinder imbalance of at least one cylinder with low compression.
- The injectors all seem to cycle properly through the test cycle.
- Drove down the road to my mechanic to check out and smoke cleared up. Left it idling for a time while mechanic ran scan and smoke started up again.
- Found out #4 was about 138 low on the power contribution test. #5 was about 30 low with the rest of the cylinders around 2 to 3 low. Received my schooling on the 6.0 at this time =O/
- Since then, I have pulled the #4 injector and found a little blow-by on the lower o-ring with dark carbon build-up on tip. Other injectors pulled show lighter grey matte color and dry.
- Pressurizing the cylinder through the glow plug hole I hear air coming through the intake and exhaust pipe with valves in closed position. Opening the valves slightly, by pushing down on the valve stems (rocker arms were removed to check push rods - straight as arrows on the intake side, at least).
Running a Carfax on the truck I was able to determine the last reported service location. I contacted them and found out that they had the truck in last February because it was running awful. They determined that the #4 injector was "dumping fuel" so they say they "replaced" it (probably did not torque bolt properly). They also determined "low compression" at #5. At that time, they replaced the EGR and oil coolers. They admitted that they were not diesel techs, being a fleet service outfit.
So, I am struggling to figure out what has happened to #4 and #5, with #4 being the primary concern.
Is there anyone here who has had a similar scenario occur resulting with the same symptoms?
I am thinking that it has suffered a hydrolock at #4 causing damage to the valves and/or connecting rod? Is pulling the head for a look see the only approach at this point? I don't have an articulating scope.
We did empty the coolant and oil. There was no cross contamination that was visible. The truck probably had 3000 miles on the oil since last changed and was showing about 1/4 " low on the stick. Would it be worth while to get a coolant and oil analysis done or just a waste of money at this point?
Also a note of interest: There was a small amount of metal dust found on the oil plug magnetic tip.
I sure would appreciate some advice if anyone would be kind enough to share.
Last edited by ne14Yah; 01-15-2014 at 05:31 PM.