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  #101 (permalink)  
Old 04-05-2012, 11:52 PM
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Originally Posted by SRT8Tech View Post
Just confirmed 2 chain failures in the past few weeks at the dealer I worked at. I asked the engine guy if he had seen any chain failures on the 5.7's and he was like "yeah 2 in the past few weeks". I said get ready for ALOT more to come in. LOL
If you can get the mileage of those two cars and the approximate date of the incident that would be of great help.
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  #102 (permalink)  
Old 04-07-2012, 06:47 AM
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Another good reason to buy a SIX SPEED car. I am glad I did!!!
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Old 04-07-2012, 06:57 AM
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And has anyone heard of the other 5.7 cars/trucks having this problem?
It can't just be the Challenger as we all know that when the motors arrive in Brampton, the assembly line has Chargers as well as our Challengers.

And what I'm wondering is why hasn't the folks with supercharged cars had this problem shortly after the added horsepower which has to of added more stress than a stock hp car.
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Old 04-07-2012, 07:06 AM
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Originally Posted by mopardude3 View Post
This is happening mainly on MDS equipped cars, correct? I have a co-worker that is a mechanical engineer that used to work in the design group of a major auto mfg. The MDS system induces a lot of vibration into the engine. You dont feel it because they put a lot of design time into dampening the vibration with the drive line mounts. Think of what would happen with a 1970 motor if you disconnected half of the spark plugs.

So it might be that if you hit a certain combination of RPM's and load, that you could cause part of the timing chain system to vibrate at a harmonic frequency that causes premature fatigue failure.
There's little doubt in my mind that the MDS is a contributing factor. My 2011 Jeep Grand Cherokee has the 5.7 engine with MDS and I can feel vibration at certain highway speeds, particularly when it seems the computer's deciding whether or not the MDS should be deployed or cut off because of a grade or need to accelerate where more power is needed. The transition is sometimes not as seamless as Chrysler portrays. I said this in a survey questionnaire that was e-mailed me after buying my Jeep. I often feel like it actually wastes more gas than it saves gas due to loss of engine efficiency while it kicks in and out. IMO, I'd rather scrap the MDS feature because I get crappy gas mileage anyway.
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  #105 (permalink)  
Old 04-07-2012, 07:47 AM
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it could have a lot to do with driving habits too. if you drive heavy footed, where you go in and out of mds over and over and over again, that could contribute to the tension on the chain changing causing stress
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Old 04-07-2012, 07:56 AM
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Originally Posted by aarcuda View Post
it could have a lot to do with driving habits too. if you drive heavy footed, where you go in and out of mds over and over and over again, that could contribute to the tension on the chain changing causing stress
No doubt in my mind. I tend to want to drive the Jeep like it's my Challenger. Having had a 2010 R/T Classic R/T a 6 spd, I can sure feel the difference with MDS present. I know the Jeep's much heavier, but the engine should still be smooth. It literally does feel like it's running on 4 cylinders.
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Old 04-16-2012, 05:57 PM
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Mine is in the shop with a broken timing chain as I write this and I am hoping it is not the beginning of things to come. It has been in there for a week. I have an "10 RT Challenger with 46k miles on it. I would be happy to answer any questions that I know the answer to.
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Old 04-16-2012, 06:13 PM
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Originally Posted by fupduk2 View Post
Mine is in the shop with a broken timing chain as I write this and I am hoping it is not the beginning of things to come. It has been in there for a week. I have an "10 RT Challenger with 46k miles on it. I would be happy to answer any questions that I know the answer to.

Automatic I presume?
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Old 04-16-2012, 06:32 PM
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Doesn't matter how u drive mds should have been designed when you hold a given speed only in 5th gear like an overdrive, instead it turns on and off 100 times a day whenever it wants to. This is what I believe is causing the stress on the vehicle. I hope I make it to 35,000 and I will probably replace tensioner and chain. By the way never had this type of maintenance on a vehicle before lol.
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  #110 (permalink)  
Old 04-16-2012, 07:08 PM
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I wonder if Resumespeed could find out whats going on with these timing chains and if it could be that MDS is the culprit.Why does it seem to be Challengers 5.7 autos.
I personally have not heard of any 2009 up Chargers/Rams/Jeeps with the 5.7 having this issue.
I have PM'd resumespeed to see if he has any info or knowledge of these events.
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