4.0L piston breakage - North American Grand Cherokee Association

OverlandZJ · 07-19-2011, 11:13 AM

How many have had the piston crack or break on your WJ? I just bought a 99 with a broken #2 piston, i'm hoping the cylinder wall is not damaged. I havent seen it yet.. pick up tomorrow.

Have a cylinder mic, hone, ring gapper and compressor enroute from a bud, i'll check for gouges and egging of the wall, if the block is salvageable i might just pick up an overhaul kit and put it back together.

Looking for feedback from those who had the issue, were you able to save the block without a bore?

OverlandZJ · 07-22-2011, 07:59 AM

Thought there would be some feedback here... seems pretty common as there are several threads on JF.

Anyway, got the Jeep home and gave it a bath. I am gonna wait till my XJ is fully parted and gone before i tear this down to inspect the cylinder.

FlexdXJ · 07-29-2011, 06:36 AM

What you gonna build an Overland WJ now!

I'm gonna miss your XJ! This looks like a good purchase though.

OverlandZJ · 07-29-2011, 08:15 AM

The XJ is pretty much a shell now.. with my axles and suspension that i'll be swapping over to the ZJ.

This WJ was an impulse buy.. and was cheap. Originally planned to swap in a 96 motor with 60K i'v had stored in garage for 10 years. Come to find out the blocks are cast different.

FlexdXJ · 07-29-2011, 11:33 AM

Quote:

Originally Posted by OverlandZJ

The XJ is pretty much a shell now.. with my axles and suspension that i'll be swapping over to the ZJ.

This WJ was an impulse buy.. and was cheap. Originally planned to swap in a 96 motor with 60K i'v had stored in garage for 10 years. Come to find out the blocks are cast different.

Oh well sometimes you get bored and build different toys. I had heard of them being cast different making it a problem.

OverlandZJ · 07-29-2011, 11:48 AM

16 years in an XJ.. was ready for a change. I have a thread at NAXJA.. once i get back to work on it i'll start one here.

FlexdXJ · 07-29-2011, 12:14 PM

I'll check your thread out. I'm just over here trying to figure out why my cousins WJ is running like a pile right now!

07-19-2011, 11:13 AM	#1
OverlandZJ Senior Member Grand Junkie Join Date: Aug 2007 Location: Bristol,Pa Posts: 269	4.0L piston breakage How many have had the piston crack or break on your WJ? I just bought a 99 with a broken #2 piston, i'm hoping the cylinder wall is not damaged. I havent seen it yet.. pick up tomorrow. Have a cylinder mic, hone, ring gapper and compressor enroute from a bud, i'll check for gouges and egging of the wall, if the block is salvageable i might just pick up an overhaul kit and put it back together. Looking for feedback from those who had the issue, were you able to save the block without a bore? __________________ John B 98 ZJ Laredo 4.0 99 WJ Laredo 4.0L 94 XJ "OverlandXJ"- parted

07-29-2011, 08:15 AM	#4
OverlandZJ Senior Member Grand Junkie Join Date: Aug 2007 Location: Bristol,Pa Posts: 269	The XJ is pretty much a shell now.. with my axles and suspension that i'll be swapping over to the ZJ. This WJ was an impulse buy.. and was cheap. Originally planned to swap in a 96 motor with 60K i'v had stored in garage for 10 years. Come to find out the blocks are cast different. __________________ John B 98 ZJ Laredo 4.0 99 WJ Laredo 4.0L 94 XJ "OverlandXJ"- parted

07-29-2011, 11:48 AM	#6
OverlandZJ Senior Member Grand Junkie Join Date: Aug 2007 Location: Bristol,Pa Posts: 269	16 years in an XJ.. was ready for a change. I have a thread at NAXJA.. once i get back to work on it i'll start one here. __________________ John B 98 ZJ Laredo 4.0 99 WJ Laredo 4.0L 94 XJ "OverlandXJ"- parted

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

07-22-2011, 07:59 AM	#2
OverlandZJ Senior Member Grand Junkie Join Date: Aug 2007 Location: Bristol,Pa Posts: 269	Thought there would be some feedback here... seems pretty common as there are several threads on JF. Anyway, got the Jeep home and gave it a bath. I am gonna wait till my XJ is fully parted and gone before i tear this down to inspect the cylinder. __________________ John B 98 ZJ Laredo 4.0 99 WJ Laredo 4.0L 94 XJ "OverlandXJ"- parted

07-29-2011, 06:36 AM	#3
FlexdXJ Junior Member Grand Rookie Join Date: May 2010 Location: Columbus, IN Posts: 12	What you gonna build an Overland WJ now! I'm gonna miss your XJ! This looks like a good purchase though.

07-29-2011, 12:14 PM	#7
FlexdXJ Junior Member Grand Rookie Join Date: May 2010 Location: Columbus, IN Posts: 12	I'll check your thread out. I'm just over here trying to figure out why my cousins WJ is running like a pile right now!

Remove Advertisements Sponsored Links
Nagca.com Advertisement