Join Date: Aug 2019
Location: The Rocket City
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 4.7L V-8
If 4WD - system: QT-I
Current Mileage: 177K
4.7L Catastrophic Failure - Engine
Well, I've now graduated out of the "New" section so now I can come here and play...
I bought an 06 Limited a couple of weeks ago as a project vehicle. I thought it was going to be an easy fix, but I was wrong, very wrong..
The vehicle had overheated. One of the plastic "T" junctions of the heater hose near the firewall failed and lost most if not all of the coolant, which caused the overheat condition. I had it towed home as it barely ran and when it did, it made a helluva racket.
1st order of business was to pull the plugs and do a compression test. The rear cylinder on the driver's side registered at "0" PSI.
Removal of the valve cover assured the valve train was intact. I was hoping that the valve train was the issue...but no...
So, I removed the driver's side cylinder head. Yes, friends..the intake valve seat let loose, fell in the combustion chamber and beat the ever loving day lights out the piston and the cylinder head!
I removed the passenger side cylinder head. All looks good there...
I was simply going to drop the pan, remove the piston, replace it with a good one, replace the heads and intake and go from there but after I saw what a nightmare it was to remove the pan, I said no way - I'm pulling the engine.
Here are a couple of pictures of the carnage....