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  #25  
Old 11-21-2010, 12:03 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

I've read on the G8 forums about aftermarket intakes which weren't designed correctly, causing hydro-lock in heavy rain scenarios.

Pretty sure the Jeep design team tested these intakes thoroughly in heavy rain, but there is always the possibility that there could be a design error. Early on it is always the "customer's fault."

On the flip side, if the puddle wasn't 12" and the speed wasn't 5mph, it could legitimately be the driver's fault.
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  #26  
Old 11-21-2010, 12:11 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

i think (just my opinion) that something let go, slammed thru the oil pan, you lost oil, then your engine seized. look under the truck, is there any oil underneathe? i mean on the front diff, floorboards, trans, anything on the veh. if so, id say it is/was a defect in your motor. and as i lost count as to how many times it has been said, Hydro-Lock occurs instantly. i have been offroading for 5 years now, and the 2 times ive seen it happen, stock intake, 4ft deep mud puddle, alcohol, hey watch this, pedal to the floor, big splash, motor shuts off, guy says what happen. this is all in a matter of about 5-8 seconds. not on his trip home. i have dropped off a ledge and into a puddle at around 10-15 MPH, water came up over my hood, and i almost cried, but it stayed running, and when i got home i checked the intake box, no water in the bottom, and my filter was dry. on a ZJ (mine) the air is grabbed from directly behind the grille, just beside the driver headlight. it is "kinda" like a cold/ ram air effect, but not, lotsa ops for water to get in i think. baha. IMO (and with all due respect, if the story is EXACTLY what happen) motor defect, hire a good lawyer. hydro lock will be instantaneous. bottom line
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  #27  
Old 11-21-2010, 12:14 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

^ That's right, Marlin, xmonger and 95 v8 ZJ. And any water that does make it in has to get through the air filter too which isn't exactly an easy portal. I'd like to see picks of the thrown rod, rod bearing, big-end cap and rod bolts that connect that rod to the crankshaft. There is not much more frustrating than having expertise about something than hearing someone else (a forum member) be given a most unlikely, dare I say impossible, cause of his engine failure based on the stated circumstances.

The problem is, if the dealer tech or service manager thinks it was water (hydro lock) and says so to Chrysler, he is now the eyes and ears of Chrysler no matter how incorrect that tech may be if we are to interpret the circumstances as stated. The proof needed in order to get warranty work performed is to disprove the dealer's diagnosis...did the engine blow in a stream or on a paved road? Tow records can prove that.
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  #28  
Old 11-21-2010, 12:21 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

When the WK was new a guy here in Australia had a Laredo diesel a short time, and hydrauliced it in a 'mild" water crossing.

He fought like hell to get it under warranty, citing issues with air intake height etc, claiming the water was only shallow, but how could it be proved? The dealer found water in the intake tube, and that was that.

Unfortunately the V6 diesel on its own is outrageously priced, and he found himself with a $60k vehicle that required a replacement engine at what from memory was something outrageous and ridiculous of $62k!
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  #29  
Old 11-21-2010, 12:35 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

dsi jeep, there is a rubber gasket that lines the hood at the driver's side, right in front of that air intake. it appears to be a very solid seal for purposes of preventing water from entering that air intake. air is forced to travel around the rubber gasket at nearly right angles before it gets to that intake scoop.

i would bet you could point a water hose at that driver side corner where the hood meets the engine bay and not get water into the intake.
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  #30  
Old 11-21-2010, 12:38 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

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?
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  #31  
Old 11-21-2010, 12:49 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

Quote:
Originally Posted by moosehead View Post
dsi jeep, there is a rubber gasket that lines the hood at the driver's side, right in front of that air intake. it appears to be a very solid seal for purposes of preventing water from entering that air intake. air is forced to travel around the rubber gasket at nearly right angles before it gets to that intake scoop.

i would bet you could point a water hose at that driver side corner where the hood meets the engine bay and not get water into the intake.

I don't want to side track the thread here, but if you get a chance could you snap a photo of that and post it? I'm not sure I see that under my hood.
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  #32  
Old 11-21-2010, 01:16 AM
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Originally Posted by Nbtstatic View Post
I don't want to side track the thread here, but if you get a chance could you snap a photo of that and post it? I'm not sure I see that under my hood.
I think that pic of the intake might have been from my LED thread. If so I can tell you that seal over the top of he intake opening is about an inch thick and seals against the hood to keep out water. There is no separate seal on the hood itself. Also when I took the air box out changing the LEDs it did not have a drain at the bottom of the box itself but like someone else said water would have to go through several sharp turns to even make it into the box. If the OP would like some info on how I got Chrysler to man-up and give me a free lifetime bumper to bumper because of my complimentary built in shower (no it was not an option I wanted !) and some other issues send me a PM.
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  #33  
Old 11-21-2010, 01:19 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

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Originally Posted by jeep2011 View Post
There is no way that 12" of water would have made it into the air intake, unless someone was flying through the water. Even then I have flown through water deeper than that and never got water in the intake. These Jeeps even have a drain for water that makes it down the intake tube.

I would ask the service people just how much water was in there. If it rained it would even show a few drips of water in there.

Also there is no way that water would have damaged the engine and you made it nearly 700 miles before you experienced any problems. It would have been an immediate failure. It sounds as if the engine threw the rod as described and the engine blow due to having no oil.
100% agreed. I am not a certified mechanic, but I've been working on cars since I was 9 years old. My experience is with much older engines, and I'll admit the newer technology in today's vehicles is mind-boggling, but one thing that remains constant is hydro-locking an engine is INSTANT and immediate failure.
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  #34  
Old 11-21-2010, 01:26 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

Moose, you are probably correct. As I have listed I have WJ and have no idea about the intake design on the WK and WK2. But the picture posted shows front of the intake too open with weatherstrip on the top. I could not see on this pic the guard you have mentioned. Sorry.
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Old 11-21-2010, 08:44 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

Quote:
Originally Posted by Marlin View Post
Can you please explain to me where in your pictures above there is a broken conrod?

I clearly see a hole in the sump, but I can't see a rod thats let go? I can see all the conrods except one..... it's close to Top Dead Centre, and the hole in the sump isn't corresponding to where I'd expect to see a broken rod.

The hole in the sump, when you inspect it does it look like something's come through from inside? Or impact from under the car?

I was expecting to see MUCH more carnage within the engine.

And, the other guys are spot on, if it's going to shit itselg from a hydrolock, it'll do it immediately, unless somehow miraculously the water has sat in the intake somewhere for hundreds of miles and then somehow found it's way to the engine..... massively unlikely!

We're here to help bro! This is SHIT.
Take a look at the bolt on the rod cap that I circled in red (zoom in on the picture). It is clearly damaged from puncturing the pan. And it does line up perfectly with the hole in the pan. Keep in mind that the orientation of the pan and the picture of the crankcase is reversed. You need to flip the pan around the other way in order to see that it does match up.

That said, I'm still surprised the rod cap is attached. I thought for sure it would have been torn off. In the picture, it does seem that it is still tightly attached, but then again it can be hard to tell from the picture.
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  #36  
Old 11-21-2010, 08:53 AM
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Re: 2011 Jeep Grand Cherokee 3.6L Pentastar V6 BLOWN-UP ENGINE!

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.
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