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Unread 12-09-2012, 09:05 PM   #1
wincdub
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2002 WJ 
 
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Location: Great Falls, Mt
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Omg... First time jeep owner lost #2 cylinder after two months!!!!

I AM NOT mechanically inclined! What I know about my Jeep I have learned over the past couple months so please be patient with my ignorance.
My family purchased a 2002 grand cherokee limited 4.7l v8 in may and in July suddenly lost all compression in the number two cylinder. 100% leak down.
After removing valve cover and replacing spring the rocker arm will not stay in place. Valve is obviously stuck open. This is the extent of the work the shop did and they recommended a full engine replacement. They stated that the cost to pull the head and determine is there is block damage and get the cylinder machined and reinstallation costs are very nearly what a new engine would cost.
We have considered remanufactured engines as used engines are similar in cost and have less warranty coverage. But the cheapest quote we can get is $4600.
It has bothered me for a while that noone has even mentioned the option of replacing the cylinder head...

SOMEONE PLEASE HELP!!!
Chris

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Unread 12-09-2012, 10:12 PM   #2
Lakoswolf
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Hi Chris,

I think you may find more WJ assistance here: http://www.jeepforum.com/forum/f310/ as that section covers the 1999-2004 Grand Cherokee The ZJ (this section) covers the 1993-1998 Grand Cherokee. You may also wish to change your Jeep description as the XJ denotes the smaller Cherokee model Jeep. As far as engines go, I've heard nothing but good things about Jasper Engines and Transmissions but I've never dealt with them myself.
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Unread 12-10-2012, 04:36 AM   #3
Foundrydude
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Quote:
Originally Posted by wincdub View Post
It has bothered me for a while that noone has even mentioned the option of replacing the cylinder head...
The valve may have damaged a piston, but you won't know that til it comes apart. There is cost to taking that gamble, and it's a big gamble. The most likely reason the valve won't close is that it's tweaked from contacting the piston

Unless you're doing your own work, the replacement engine is the way to go. If you wanna be cheap, get a used engine from a salvage yard.
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Unread 12-10-2012, 09:52 AM   #4
Double E
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Sounds like another dropped valve seat.

A bore scope will tell for certain but the cause is often an overheat situation that went on too long, heated the piston, caused the steel valve seat to expand against the aluminum head & drop around the valve, preventing it from sealing and also....very likely break apart, damaging the piston and cylinder walls.

If it ever overheated on your family or the previous owner, there's probably a new radiator in there now..or if not, there also needs to be.

If they bought it in May and it failed #2 in July, ask about any overheats they had and what they did to stop the overheat... ask about the repairs done to it & why to get a full story.

Begin to source another engine.
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Unread 12-10-2012, 05:08 PM   #5
oldfamilyguy
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Quote:
A bore scope will tell for certain
Yes, a look inside will tell you want you need to know. You may be lucky and the dropped valve seat did not break up and that whats holding that valve open. The head would have to come off for the repair but probably worth it.
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Unread 12-11-2012, 03:52 PM   #6
white_2003
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http://www.powertrainproducts.net/do...engine-p/1.htm
This is the company we will be buying our engine from when (if) the wj gives up the ghost 2499.99 not bad IMO.
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Unread 12-11-2012, 03:55 PM   #7
Jeepgcl9947
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All I know is if you need a good drivers side cylinder head I got one forsale!
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Unread 12-11-2012, 04:52 PM   #8
leftlanetruckin
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Certainly not to the point of junking the motor IMHO.
Remove the head and have a looksie. Not hard to do DIY in my book.

Martin
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Unread 12-16-2012, 12:20 PM   #9
wincdub
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I want to remove the head and troubleshoot myself to save money and try to avoid the more costly avenue of replacing the entire engine. We mostly want to just get it running and trade it back to the shady dealer we bought it from!!! Since it was from a dealer of course they deny the vehicle ever having any issues or even signs of concern prior to our purchase haha... At any rate we have decided to go for a reman engine if necessary as used engines are almost just as expensive and they have the mileage on them and lack the warranty of the reman units.

Since the #2 cylinder is on the passenger side we do not have much use for a driver side head at the moment but given my good fortune I may stand in need of one before Im able to get rid of this junk pile!

Any help regarding the necessary tools or a diy for dummies to help me stumble through my first venture taking off this cylinder head would be fantastic!! Thank you all for your input I realy appreciate it!

Chris
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Unread 12-16-2012, 12:26 PM   #10
wincdub
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Unhappy Omg... First time jeep owner lost #2 cylinder after two months!!!!

I AM NOT mechanically inclined! What I know about my Jeep I have learned over the past couple months so please be patient with my ignorance.
My family purchased a 2002 grand cherokee limited 4.7l v8 in may and in July suddenly lost all compression in the number two cylinder. 100% leak down.
After removing valve cover and replacing spring the rocker arm will not stay in place. Valve is obviously stuck open. This is the extent of the work the shop did and they recommended a full engine replacement. They stated that the cost to pull the head and determine is there is block damage and get the cylinder machined and reinstallation costs are very nearly what a new engine would cost.
We have considered remanufactured engines as used engines are similar in cost and have less warranty coverage. But the cheapest quote we can get is $4600.
It has bothered me for a while that noone has even mentioned the option of replacing the cylinder head...

SOMEONE PLEASE HELP!!!
Chris
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Unread 12-16-2012, 01:02 PM   #11
wincdub
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These are pics of the cylinder and you can see that the rocker is loose in its position and can easliy be removed. Of course this is after whatever the ship did when I first took it in. They tried to replace the injector spring I believe and could not get the rocker to stay in and that is when they told me the valve was stuck open and quit working on it at that point.
imag0706.jpg   imag0707.jpg   imag0708.jpg   imag0709.jpg  
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Unread 12-16-2012, 03:01 PM   #12
Darnice
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Valve bent, won't retract. In the first pic, that roller in the rocker looks out of place. Are those metal shavings on the cam?
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