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  #37  
Old 11-21-2010, 09:29 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

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Originally Posted by MSCA View Post
Just realized something else.... you can tell from the pic that either the rod or the cap has to be broken. It's obvious that the orientation of those two caps (the two furthest to the left) is nearly the same on the crankshaft, which should never be the case. Since the engine is a "V" configuration, the rods are in pairs, one for each opposite side piston. So the caps should always be opposite one another, if you know what I'm trying to say. Look at the pair in the center and notice the relation of each set of rod caps.
and if it happened as the dealer explained, the hole in the pan was punched before he set off to drive home, and those caps were mis-aligned before his drive as well.
i'd think its safe to say that he would have felt SOMETHING abnormal with the engine on that drive prior to breakdown. no? misfires, strange idle, something?

unless the water was in THAT cylinder, and the pressure that resulted was enough to tweak that rod right away, resulting in an instant hole in the oil pan, and a miraculous 700 mile drive on no oil? is that possible? limited knowlege here, just trying it out.



but... shouldn't that part with the damaged bolt be able to make a full rotation anyway? if its just not aligned properly, shouldn't it still spin around? why NOW does it hit the oil sump?

also... how, after 700 miles in dry weather, could there POSSIBLY have still been water in the intake tract where they said they found it?
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  #38  
Old 11-21-2010, 09:33 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

I will post additional photos (the site only seems to let you post 3 at a time). As to DavidB's comment, what am I missing? How about when the regional Tech investigated the vehicle, he pulled the door panels off looking for signs of water entry- he found NONE. Or that Chrysler had the data from the Tech II ( or whatever Chrysler calls their data recording computer in the vehicle), and saw the data showing the fault codes at the time it blew up, and nothing that I did to cause it. Or how about my sister-in-law driving her 10 year old GMC Yukon thru the same puddle with no problem. Or that her full grown yellow Labrador waded thru the same puddle, and it only came up to her stomach, which is 12". How did I drive home 700 miles over 12 hours, in dry weather, only to have the catastrophic failure a week after the rainstorm and driving thru the puddle? Why have I been so patient, working thru the warranty system for 6 weeks, continuing to make car payments and not even a loaner car to drive. Frankly, I just wanted others to know that there may be something wrong with this new design engine AND hear about the "wonderful" customer service I'm getting from Chrysler!
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  #39  
Old 11-21-2010, 09:53 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

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Originally Posted by Marlin View Post
editing: Moose, looking at the pic above, is there an additional hood seal other than the one evident in the pic above? Ie, one attached to the hood itself?
Yes, it is attached to the underside corner of the driver's side hood and sits down onto the engine bay in front of the intake scoop.



Maybe it should be double sided?



Yellow line shows where hood gasket sits down on front of engine bay.

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  #40  
Old 11-21-2010, 10:05 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

Maybe dsi jeep was onto something with this scoop and gasket setup? The more I look at it, the more it looks like a possibility.

OP, what were the driving conditions when you shut down?
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  #41  
Old 11-21-2010, 10:15 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

COST554 hopefully you can take all of these comments and use them against the dealer. Something sounds very fishy about their diagnosis.
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  #42  
Old 11-21-2010, 10:26 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

From the hood gasket/intake pictures I can definitely see some water getting in the box through driving in a downpour. Not enough to hydro-lock a motor, but maybe enough to deny a claim for a motor that gave up the ghost due to other reasons?

Can someone post a complete pic of the V6 engine bay?
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  #43  
Old 11-21-2010, 10:30 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

Quote:
Originally Posted by moosehead View Post
Yes, it is attached to the underside corner of the driver's side hood and sits down onto the engine bay in front of the intake scoop.



Maybe it should be double sided?



Yellow line shows where hood gasket sits down on front of engine bay.

Maybe the OP should check his. My Jeep does not have anything like what you show in the photo.
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  #44  
Old 11-21-2010, 10:33 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

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Originally Posted by Nbtstatic View Post
Maybe the OP should check his. My Jeep does not have anything like what you show in the photo.
Is there a difference between Hemi and V6 with regards to this hood gasket, or was this accidentally left off some jeeps like the side molding of one of our members?
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  #45  
Old 11-21-2010, 10:38 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

I feel awful for the situation that your in, it just blows. This is kind of unrelated but.......
This is just another example of manufacture's, especially Chrysler voiding warranty for stupid reasons. They(Chrysler) are even more ridiculous when voiding warranty's on trucks with Cummin's engines. I've been victim and heard of warranty's being void for drop in filters, air intakes, oil/fuel filters, excess EGT's. The list go's on and on. They will void even if you have unrelated mods/upgrades that are not related to your repair.
Also, I recommend keeping complete and accurate service records. Keep every receipt. Every time I take one of my heavy duty trucks in for warranty work, the service writer needs to verify every record. Absolute BS
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  #46  
Old 11-21-2010, 10:47 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

Quote:
Originally Posted by xmonger View Post
From the hood gasket/intake pictures I can definitely see some water getting in the box through driving in a downpour. Not enough to hydro-lock a motor, but maybe enough to deny a claim for a motor that gave up the ghost due to other reasons?

Can someone post a complete pic of the V6 engine bay?

I think some of the members here are making too much of the air intake and gasket(s). For the most part, you have to completely submerge the air intake in order to even have a chance at causing hydro-lock. That's because the air will always be "sucked up" easier than water. So even if some water enters the tube, it's the air that will enter the engine for the most part. Some water may enter too, but in order to hydro-lock the engine, the cylinder(s) have to have enough water in them to fill the volume of the cylinder(s) at top dead center of the compression stroke.

In a V6 of this size, the amount of water necessary is approximately 65ml to fill the combustion chamber enough to cause hydro-lock. And since the water is likely to be somewhat evenly distributed between the cylinders, you can multiply that by six to get a realistic estimate of what it would take to hydro-lock this engine. Unless somehow all the water got into a single cylinder, which seems highly unlikely.
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Old 11-21-2010, 10:54 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

Quote:
Originally Posted by wk2overland View Post
and if it happened as the dealer explained, the hole in the pan was punched before he set off to drive home, and those caps were mis-aligned before his drive as well.
That hole is big enough that it would drain just about all the oil within a minute or two. And once the oil is gone, the engine probably wouldn't run for more than a few minutes before self-destructing.

As far as the rod cap being misaligned....you have to realize that it can only happen with a catastrophic failure. Either the rod or the cap is broken. Or possibly the wrist pin that connects the rod to the piston. Either way, there's no way it wouldn't be completely noticeable to the driver. It would make quite a racket and the engine would start running roughly immediately. And there would be a loss of engine power. The check engine light would also come on immediately (due to misfire in that cylinder).
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  #48  
Old 11-21-2010, 11:00 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

Quote:
Originally Posted by xmonger View Post
From the hood gasket/intake pictures I can definitely see some water getting in the box through driving in a downpour. Not enough to hydro-lock a motor, but maybe enough to deny a claim for a motor that gave up the ghost due to other reasons?

Can someone post a complete pic of the V6 engine bay?
Here is a pic of the V6 Pentastar engine bay taken from an online review in about June 2010. The air inlet and box look pretty much like the Hemi's which were shown in earlier posts on this thread.
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File Type: jpg GC Pentastar V6 engine bay.jpg (315.1 KB, 184 views)
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