My engine was making a knocking sound, to I dropped the pan and found this...
Just wondering how common this is. I looked at the pistons I pulled from my '98 4.0 and 5 out of 6 had the start of the same failure.
I don't remember the year of this particular engine and the mileage is unknown.
Broken 4.0L piston
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brewmenn
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- Location: Inkster, Michigan
Broken 4.0L piston
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Flash
- I love JeepStrokers.com!!
- Posts: 693
- Joined: February 17th, 2008, 10:45 pm
Re: Broken 4.0L piston
WOW!!!!!!!!
And not even a stroker!
And not even a stroker!
89 XJ with 300,000 on the original eng
"I've also never completed a motor, yet. My mouth (fingers) is also writing checks my ass can't cash."
"I've also never completed a motor, yet. My mouth (fingers) is also writing checks my ass can't cash."
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gradon
- Donator
- Posts: 1353
- Joined: February 13th, 2008, 5:33 pm
- Stroker Displacement: 4.6/280ci
- Vehicle Year: 1996
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
- Location: DC
Re: Broken 4.0L piston
Damn, they must've used the bad batch on your 4.0(or someone didn't take care of it to well).
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Shark
- Consistent
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- Location: Tampa Bay
Re: Broken 4.0L piston
heres a problem i had a while back.
'91 MJ 4.0 ax15 Resto-mod street truck project, stroker candidate
'93 XJ 2door 4.0 aw4 np231 7" lift 33's
'95 XJ 4door 4.0 aw4 2" 31's
'95 XJ 4door 4.0 aw4 np231 4" lift 31's RIP
'93 XJ 2door 4.0 aw4 np231 7" lift 33's
'95 XJ 4door 4.0 aw4 2" 31's
'95 XJ 4door 4.0 aw4 np231 4" lift 31's RIP
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Flash
- I love JeepStrokers.com!!
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- Joined: February 17th, 2008, 10:45 pm
Re: Broken 4.0L piston
A picture like that, NEEDS, a story to go along with ittigerShark wrote:heres a problem i had a while back.
Flash
89 XJ with 300,000 on the original eng
"I've also never completed a motor, yet. My mouth (fingers) is also writing checks my ass can't cash."
"I've also never completed a motor, yet. My mouth (fingers) is also writing checks my ass can't cash."
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Shark
- Consistent
- Posts: 268
- Joined: February 14th, 2008, 8:51 pm
- Location: Tampa Bay
Re: Broken 4.0L piston
not too much to tell. had a hairline in my head gasket next to my number 1. caused it to run lean. my fire power ignition kit burned a hole in the piston.
'91 MJ 4.0 ax15 Resto-mod street truck project, stroker candidate
'93 XJ 2door 4.0 aw4 np231 7" lift 33's
'95 XJ 4door 4.0 aw4 2" 31's
'95 XJ 4door 4.0 aw4 np231 4" lift 31's RIP
'93 XJ 2door 4.0 aw4 np231 7" lift 33's
'95 XJ 4door 4.0 aw4 2" 31's
'95 XJ 4door 4.0 aw4 np231 4" lift 31's RIP
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SilverXJ
- Global Moderator
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- Stroker Displacement: 4.6L
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- Vehicle Model: Cherokee
- Location: Radford, Va
Re: Broken 4.0L piston
Meh.. weak.. all of you..
That is the entire piston. Nothing left in the block but the rod.
To the OP, did you have any odd noises or abuse your 98 engine in anyway?
That is the entire piston. Nothing left in the block but the rod.
To the OP, did you have any odd noises or abuse your 98 engine in anyway?
2000 XJ. 4.6L stroker
00+ Viper Coil Swap | CPS Timing Increase Mod | Fabricated Airbox | Dash bezel, Arduino Multigauge & RD Conceal
Eat, breath, drink, sleep, Jeep, drink
00+ Viper Coil Swap | CPS Timing Increase Mod | Fabricated Airbox | Dash bezel, Arduino Multigauge & RD Conceal
Eat, breath, drink, sleep, Jeep, drink
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Sinbad
- Posts: 4
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- Location: Fayetteville N.C.
- Contact:
Re: Broken 4.0L piston
The first pic is what happend to mine. SOOOO I now have a 4.6
Caused by a worn cylender bore.
Caused by a worn cylender bore.
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bratcop
- Making Progress
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- Stroker Displacement: 4.5L
- Location: Sheboygan, WI
Re: Broken 4.0L piston
I had a piston in my 2001 4.0L that looked exactly like that...was one of the middle cylinders, bought it that way at a deep discount....not sure how common, but we must have had something in common because it looks exactly the same as yours 
2001 GC Laredo
4.5 Stroker, 9.6 SCR, 8.1 DCR
Stock Valvetrain
24# Cobra Injectors
Bored Throttle Body
CAI
Ported and Polished 0331 Head
SplitSecond PSC1-003 Piggyback
Zeitroniz WideBand O2 logger
(all of this is still in the works as we speak)
4.5 Stroker, 9.6 SCR, 8.1 DCR
Stock Valvetrain
24# Cobra Injectors
Bored Throttle Body
CAI
Ported and Polished 0331 Head
SplitSecond PSC1-003 Piggyback
Zeitroniz WideBand O2 logger
(all of this is still in the works as we speak)
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Sailor77
- Posts: 7
- Joined: May 13th, 2010, 8:58 pm
- Vehicle Year: 1999
- Vehicle Make: JEEP
- Vehicle Model: GRAND CHEO
- Location: Fort Wayne, IN
Re: Broken 4.0L piston
Revival!!!
I have a 1999 WJ with the same thing. Just talked to another fella who has an 2000 WJ with a shattered piston. So between cracked heads and cracked pistons, the later 4.0 is not all its cracked up to be.
I have a 1999 WJ with the same thing. Just talked to another fella who has an 2000 WJ with a shattered piston. So between cracked heads and cracked pistons, the later 4.0 is not all its cracked up to be.
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basscat
- Making Progress
- Posts: 53
- Joined: December 28th, 2009, 6:28 am
- Stroker Displacement: 4.6L
- Vehicle Year: 1997
- Vehicle Make: Jeep
- Vehicle Model: TJ Sport
Re: Broken 4.0L piston
Same thing happened to my 4.0 at 230,000 miles.
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mtmech
- Posts: 4
- Joined: November 14th, 2010, 9:57 pm
- Vehicle Year: 1997
- Vehicle Make: jeep
- Vehicle Model: wrangler
Re: Broken 4.0L piston
that samething happened to my 97 tj. to my #6 piston. only thing thats left is the rod and wrist pin.
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