Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK2 - > Trouble Shooting/Problems/Service

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #85  
Old 11-22-2010, 01:21 AM
Marlin's Avatar
"The Aussie"

My Jeep: 1981 5.7L CJ
 
Join Date: May 2009
Location: Licmye Bawlls
Posts: 9,362
Thanks: 65
Thanked 17 Times in 16 Posts
Rep Power: 81094
Marlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond repute
Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

You're making HUGE assumptions saying that is the "weakest part of the rod".... how do you know that? lol
__________________

__________________
Reply With Quote
  #86  
Old 11-22-2010, 01:35 AM
DJ BoNiOmArIo's Avatar
Senior Member
My Jeep: 2006 3.7L WK
 
Join Date: Jul 2009
Location: Lone Star State
Posts: 10,324
Thanks: 5
Thanked 3 Times in 3 Posts
Rep Power: 12463
DJ BoNiOmArIo has a reputation beyond reputeDJ BoNiOmArIo has a reputation beyond reputeDJ BoNiOmArIo has a reputation beyond reputeDJ BoNiOmArIo has a reputation beyond reputeDJ BoNiOmArIo has a reputation beyond reputeDJ BoNiOmArIo has a reputation beyond reputeDJ BoNiOmArIo has a reputation beyond repute
Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

Quote:
Originally Posted by Marlin View Post
You're making HUGE assumptions saying that is the "weakest part of the rod".... how do you know that? lol
I know I'm going leap years ahead in conclusion just stating that from the general shape of that rod ... Not knowing any of the materials strengths or weaknesses or dimensions, spoke without knowing any of that sorry ... but just thought moving along that train of though since it does give a slight hint of being that way.

There are of course many possibilities that it could have happened but the OP's explanation really narrows it down to a few choices wouldn't you agree?
__________________

__________________
[SIGPIC][/SIGPIC]
Reply With Quote
  #87  
Old 11-22-2010, 01:38 AM
Marlin's Avatar
"The Aussie"

My Jeep: 1981 5.7L CJ
 
Join Date: May 2009
Location: Licmye Bawlls
Posts: 9,362
Thanks: 65
Thanked 17 Times in 16 Posts
Rep Power: 81094
Marlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond reputeMarlin has a reputation beyond repute
Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

I think a conrod failure is a possibility, but I don't think it's what happened in this case.

Without being able to touch and look at it myself, it's very hard to make an accurate diagnosis. A few thousand more photographs are needed, but I have found this a very interesting topic to be involved with.
__________________
Reply With Quote
  #88  
Old 11-22-2010, 01:43 AM
DJ BoNiOmArIo's Avatar
Senior Member
My Jeep: 2006 3.7L WK
 
Join Date: Jul 2009
Location: Lone Star State
Posts: 10,324
Thanks: 5
Thanked 3 Times in 3 Posts
Rep Power: 12463
DJ BoNiOmArIo has a reputation beyond reputeDJ BoNiOmArIo has a reputation beyond reputeDJ BoNiOmArIo has a reputation beyond reputeDJ BoNiOmArIo has a reputation beyond reputeDJ BoNiOmArIo has a reputation beyond reputeDJ BoNiOmArIo has a reputation beyond reputeDJ BoNiOmArIo has a reputation beyond repute
Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

especially on a brand new vehicle with less than 5K miles on it, for some odd reason I'm not buying into the whole air box filter crap ... just sounds too easy LOL
__________________
[SIGPIC][/SIGPIC]
Reply With Quote
  #89  
Old 11-22-2010, 06:21 AM
95_V8_ZJ's Avatar
Member
My Jeep: 1995 5.2L ZJ
 
Join Date: Jan 2010
Location: Mt. Pleasant, PA
Posts: 116
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1916
95_V8_ZJ is on a distinguished road
Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

fwiw, my 95 ZJ, my uncles 95 ZJ, my neighbors 98 ZJ, my friends 02 WJ, and my "other" Jeep ZJ do not have any type of drain in any part of the intake anywhere. sealed from where it grabs the air, to the TB. and yeah, im gonna lead towards a defect in that con rod, and chry-co trying to get out of it. i wanna see your air filter dripping wet, becuase if that con rod did break from a hydro lock, that cyl had to have been filled up so quick, and on the perfect part of the perfect stroke, to break that clean. it is bent, thats clear from the photo. and being that the veh is new, i doubt coolant would do it because it will compress... to a point... and it would have had to have filled the cyl completely. pics of the air filter, show me one of the throttle body with the plates closed, and one of the valves of the bad con rod, and just for kicks, put a str8 edge on the outside of the oil pan right over the hole and take a pic level with the bottom of the pan.

edit: i truly agree with water getting in from a vac line. maybe one got sliced, or crushed against something creating a tear or crack, and it got in that way. idk if it will pull enough thru there to only fill 1 cyl, or enough fast enough, but it is possible. See: Seafoam --> administered thru vac line, pulls it in pretty quick
__________________
'95 ZJ Limited, 4.0LNOW A V8 SUCCESSFULLY , 249, Flowmaster, Optima, BFG 32x11.50-15 M/Ts, Durango Intake, '98 style fog lts, roof lts, 3.73 gears, Dana 30/35
2001 Yamaha Raptor 660R
2001 Chevy Impala 3.8 (S/C convers)
1999 Saturn SL2 1.9 bored NOS
1995 Oldsmobile Cutlass Supreme SL 3.4 DOHC V6 PCM flash, intake, exhaust, NOS, Trans Reprogrammed
Reply With Quote
  #90  
Old 11-22-2010, 06:46 AM
Member
 
Join Date: Sep 2010
Posts: 49
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1605
Hem-e is on a distinguished road
Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

Ok, I'm no mechanic and don't even change my own oil but... I don't see a broken connecting rod in any of those pictures. All I see looks like a piece of engine block broke off one of the lower cylinder walls. Someone circle out the failure for me lol.
__________________
Reply With Quote
  #91  
Old 11-22-2010, 07:23 AM
Member
My Jeep: 2011 3.6L WK2
 
Join Date: Sep 2010
Location: Ottawa, Ontario
Posts: 962
Thanks: 32
Thanked 11 Times in 10 Posts
Rep Power: 3034
Cherodude has a reputation beyond reputeCherodude has a reputation beyond reputeCherodude has a reputation beyond reputeCherodude has a reputation beyond reputeCherodude has a reputation beyond reputeCherodude has a reputation beyond reputeCherodude has a reputation beyond reputeCherodude has a reputation beyond reputeCherodude has a reputation beyond reputeCherodude has a reputation beyond reputeCherodude has a reputation beyond repute
Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

Look at Post #68 !
__________________
Reply With Quote
  #92  
Old 11-22-2010, 09:04 AM
BEERnALE's Avatar
Premium Member
My Jeep: 2011 WK2
 
Join Date: Sep 2010
Location: Central, PA
Posts: 50
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1609
BEERnALE is on a distinguished road
Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

This is one of those Sherlock Holmes moments. When all other variables have been eliminated, take the most likely path to your conclusion.

Let's assume our OP is not lying, and not just trying to stir up the threads a bit. (Though, this is a GREAT discussion!)

Most of us that know anything about engines are finding it somewhat hard to believe this is water in the cylinder leading to hydro-lock. There are just too many oddities (but not discounting it completely without more evidence).

EmptyPockets has an interesting scenario in Post 79, and certainly a possibility (But damn! I never seen that before…).

In the end, I think there is enough evidence to be asking some harder questions of the dealership and their mechanics.

I can easily see this being a mechanic talking to the owner, and saying… “Did you drive through any water recently?”… and once hearing the “Yep”… they go right to the conclusion of hydro-lock.

COST554 , you see some of the questions here. Did they show you any definitive proof it was Hydro-lock? If not, get it!

I'm placing my money on a bad rod! But just a guess...
__________________
Reply With Quote
  #93  
Old 11-22-2010, 09:28 AM
Member
 
Join Date: Oct 2010
Posts: 213
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1753
parker is on a distinguished road
Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

Well, I've been a mechanic for over 30 years. Professionally in my younger years and as a hobby now. I do full rottisserie restorations as my hobby. Most of my vehicles score 995 and above out of 1000 points.

Something filled or entered this cylinder to cause the damage seen, no doubt at all. Water is possible, but if it were from driving conditions it would be evident in more than one cylinder.
Water coming in through the intake in large enough volume to cause this would have effected multiple cylinders, along with the filter element being soaked.
Now coolant is a very large possibility, if there were a leaking head gasket the single cylinder might have filled with coolant and caused this. The most unusual cause might be a leaking injector which partially filled the cylinder and upon start up caused the damage. This would have been very noticeable to say the least.

Regardless, if the damage occured from driving through the water, failure would have been immediate and not 700 miles later. If the connecting rod were bent and not broken the rough out of balance condition and shaking vibration would have been absolutely horrible. No way to ignore something like that for 700 miles, it would vibrate and shake in a way no one would consider normal. Once the rod broke failure was quick and noisey.

I don't know if were getting the full story or not, but if this is a hydraloc on a single cylinder, I can't see ingestion as the cause. There would be evidence in other cylinders. I would check the other possible causes as stated above. It in all possibility could have ran with the broken rod for a while, but it would have been noisey, out of balance, and performing poorly.

I have had a P/U brought to me before, driven to my shop door with a crankshaft broken at the rear throw. It came in on the rear two cylinders of the V8, the others weren't connected as the crank was severed. Stress in the component was the cause, but it was a 30 year old engine with 200,000 miles which had never been rebuilt. Sloppy bearings and pistons for years was the true root cause.
__________________
Reply With Quote
  #94  
Old 11-22-2010, 10:03 AM
Premium Member
My Jeep: 2011 5.7L WK2
 
Join Date: Oct 2010
Location: Minnesota
Posts: 105
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1628
foggy is on a distinguished road
Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

Maybe the OP could tell us how it ran for the time period(s) just prior to the failure? Or.....what warnings the EVIC displayed?
__________________
Now Driving.........
2011 Overland
5.7 Hemi, Stone White / Frost
Tech Package, Off Road Adventure II
Reply With Quote
  #95  
Old 11-22-2010, 12:09 PM
Hitchhiking
 
Join Date: Jul 2010
Posts: 876
Thanks: 2
Thanked 14 Times in 14 Posts
Rep Power: 0
MSCA is on a distinguished road
Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

It's pretty obvious that we need more pics and more information from the OP. This is an interesting topic and it's fun to play the mechanic detective (although I'm sure it's not fun for the OP) with the information given so far. Some questions to be answered:

Was there any evidence of water (or coolant) in any other cylinders?
Did anyone check the air filter to see if it was water soaked?
Did anyone examine the head gasket for obvious signs of failure?
Do any of the other connecting rods have any bends in them or are they all normal?
Has anyone pulled the OBDII codes? If so, what were they? Even if this failure happened instantaneously, there are probably some codes that were generated and stored.
__________________
Reply With Quote
  #96  
Old 11-22-2010, 12:31 PM
dubwarren's Avatar
Senior Member
My Jeep: 2014 5.7L WK2
 
Join Date: Aug 2010
Location: VA
Posts: 1,190
Thanks: 1
Thanked 18 Times in 16 Posts
Rep Power: 0
dubwarren dubwarren dubwarren dubwarren dubwarren dubwarren dubwarren dubwarren dubwarren dubwarren
Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

get a lawyer. asap. and sue the living shit out of chrysler for trying this crap on you. even if you lose you will cost them the 8k they tried to steal from you.

dont take this one laying down.
__________________

__________________
[SIGPIC][/SIGPIC]
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Just got my 2011 Jeep Grand Cherokee sleepy93 Members Rides 28 10-27-2011 12:53 AM
i have a 2000 grand cherokee with a blown 4.0 563srt8 Engine Performance/Intake/Exhaust 2 10-01-2010 07:55 AM
2011 Jeep Grand Cherokee mangoe Grand Cherokee - WK2 - 4 07-06-2010 09:56 AM
2011 Grand Cherokee/jeep future info on CNBC-Jeep ceo Scottina06 Grand Cherokee - WK2 - 6 04-01-2010 05:45 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 07:39 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by Chrysler Group LLC.