4.7L Catastrophic Failure - Engine - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 28 (permalink) Old 08-14-2019, 04:42 PM Thread Starter
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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.

Not good..

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!

Fun..

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....
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post #2 of 28 (permalink) Old 08-14-2019, 10:49 PM
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Join Date: Oct 2015
Location: East Coast of Florida
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Obviously you are far more mechanically saavy than I am, but, it doesn't take a mechanic to see that that certainly doesn't look good; I'm looking forward to following your repair work and seeing some of the step by step pics, if you have time to take some;


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post #3 of 28 (permalink) Old 08-15-2019, 05:25 AM Thread Starter
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Join Date: Aug 2019
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If 4WD - system: QT-I
Current Mileage: 177K
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Don't know about whether I'm mechanically savvy or not, I just seem to end up rescuing vehicles that have major failures. I didn't expect this one to be so catastrophic, but I'm this far now, so I might as well see it through.

I'm not a detail person when it comes to step by step pictures and write-ups, but I will provide an ongoing writeup as I move forward with this project in the hopes that it will help others.

I recently retired from the corporate plantation, so I have the time and opportunity to do this. I built a shop behind our home expressly for these types of projects and have a small lift (MaxJax) which helps immensely in getting things accomplished.

Thank you for your interest in my little story....
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post #4 of 28 (permalink) Old 08-15-2019, 10:10 AM
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Join Date: Oct 2015
Location: East Coast of Florida
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Quote:
Originally Posted by DanielDD View Post
Don't know about whether I'm mechanically savvy or not, I just seem to end up rescuing vehicles that have major failures. I didn't expect this one to be so catastrophic, but I'm this far now, so I might as well see it through.

I'm not a detail person when it comes to step by step pictures and write-ups, but I will provide an ongoing writeup as I move forward with this project in the hopes that it will help others.

I recently retired from the corporate plantation, so I have the time and opportunity to do this. I built a shop behind our home expressly for these types of projects and have a small lift (MaxJax) which helps immensely in getting things accomplished.

Thank you for your interest in my little story....
You're very fortunate. I'm looking forward to reading about it.


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post #5 of 28 (permalink) Old 08-15-2019, 04:45 PM Thread Starter
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Join Date: Aug 2019
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Model year: 2006
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Power-Train: 4.7L V-8
2WD
If 4WD - system: QT-I
Current Mileage: 177K
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On the commander, there is a structural support bracket where typically an inspection cover is at where you have access to remove the flex plate bolts. In the case of the Commander, once the structural support bracket is loose, it is impossible to remove it from the vehicle as it hits the lower crossmember. I tried six ways from Sunday to remove it and its not going to happen unless you raise the engine. Rather than putz around with doing that, I somehow positioned the structural support where I could just barely remove the flex plate bolts.

All other engine/transmission bolts have been removed and the hydraulic engine lift is in place ready to remove the short block. I will probably have to remove both engine mounts completely before lifting it out as I suspect pulling only the 2 long bolts from the engine mount is not going to get the job done as you are going to have to pull the engine forward slightly do dis-engage from the locating pins mating the engine to the transmission.

I am reserving Friday morning for this effort...
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post #6 of 28 (permalink) Old 08-16-2019, 10:27 AM Thread Starter
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Join Date: Aug 2019
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Power-Train: 4.7L V-8
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If 4WD - system: QT-I
Current Mileage: 177K
Posts: 23
Engine Removed. Plans are to extract the piston, inspect bearings and determine whether a full rebuild is necessary....
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post #7 of 28 (permalink) Old 08-16-2019, 05:00 PM
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Join Date: Feb 2019
Location: Jersey
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177K on your 06? I say rebuild it. Comon DDD, you have that sweet shop to work in and the engine is already down to the short block. At least bearings and a ring job, oil pump and lifters. You are already going to have a set of reman heads on it. I say go for it. We have your back, at least for encouragement anyway.
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Shortly after production ended, Chrysler CEO Sergio Marchionne said of the Commander, "That vehicle was unfit for human consumption. We sold some. But I don't know why people bought them."
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post #8 of 28 (permalink) Old 08-16-2019, 07:22 PM Thread Starter
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Join Date: Aug 2019
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2WD
If 4WD - system: QT-I
Current Mileage: 177K
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Quote:
Originally Posted by KIS_jeeep_06 View Post
177K on your 06? I say rebuild it. Comon DDD, you have that sweet shop to work in and the engine is already down to the short block. At least bearings and a ring job, oil pump and lifters. You are already going to have a set of reman heads on it. I say go for it. We have your back, at least for encouragement anyway.



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post #9 of 28 (permalink) Old 08-16-2019, 08:21 PM
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Join Date: Mar 2017
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Count me in for the ride, i love a good rebuild thread!
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post #10 of 28 (permalink) Old 08-17-2019, 06:05 PM Thread Starter
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Join Date: Aug 2019
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2WD
If 4WD - system: QT-I
Current Mileage: 177K
Posts: 23
Removed the offending piston today. It will definitely will have to be replaced. Surprisingly, the connecting rod bearing is in perfect shape, considering the mileage - I was surprised.

Getting the crankcase pan off took some real effort. I don't see how anyone could remove the pan while the engine is in the car. You must separate the windage tray from the block and separate the windage tray from the crankcase pan. A stiff putty knife and a hammer is the only way to remove it and you must go all the way around the pan to separate it. Once separated, you can lift the crankcase pan off and then you have to remove 4 bolts and disconnect the oil pickup tube before removing the windage tray. There is no other way....

Anyway, a couple of eye candy photos for you....
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