Timing chain failure on the Dodge Challenger

[olskooljr]

Originally Posted by rayzazoo

Incorrect oil? bad tensioner? bad tune?


Sent from my iPhone using Autoguide.com App

What oil is recommended for the 5.7s?

[19johned53]

Originally Posted by olskooljr

What oil is recommended for the 5.7s?

5-20 dino grade is recommended by the factory, but synthetic will be OK, if it's 5-20W

[STINGRAY]

Originally Posted by 19johned53

5-20 dino grade is recommended by the factory, but synthetic will be OK, if it's 5-20W

What is the factory fill?
Synthetic?

[rscarawa]

Originally Posted by STINGRAY

What is the factory fill?
Synthetic?

Dino for 5.7.

Possibly synthetic for 6.1/6.4.

[Yahooligan]

Originally Posted by rscarawa

Possibly synthetic for 6.1/6.4.

There's no possibly about it, all SRT8s come from the factory with synthetic oil.

[conceptmachine]

So, the manuals don't have MDS, so what is different about the way the timing chain runs against the guides in MDS vs NON MDS? Is there any non axial movemnt (side to side) involved when it goes in and out of MDS? You figure the manuals would be having this problem as well... but they aren't, at least not in moderate mileage cars.
So, I just want to figure out what is different parts wise and the way autos are different than the manuals. I figure that the manuals have the same solenoid, correct?

[Brent60]

Originally Posted by conceptmachine

So, the manuals don't have MDS, so what is different about the way the timing chain runs against the guides in MDS vs NON MDS? Is there any non axial movemnt (side to side) involved when it goes in and out of MDS? You figure the manuals would be having this problem as well... but they aren't, at least not in moderate mileage cars.
So, I just want to figure out what is different parts wise and the way autos are different than the manuals. I figure that the manuals have the same solenoid, correct?

People belive there is a harmonic imbalance when mds engages. You have to think even the slightest minor abnormality can cause unnecessary wear that can lead to premature part failures.

Sent from my HTC Rezound with the AutoGuide App.

[rscarawa]

Originally Posted by Brent60

People belive there is a harmonic imbalance when mds engages. You have to think even the slightest minor abnormality can cause unnecessary wear that can lead to premature part failures.

Sent from my HTC Rezound with the AutoGuide App.

It is my theory that when the mds is active, slack develops at times in the chain then it whips against the chain guide. I suspect that with the balanced nature of v8 cams, in v8 mode, pressure is even and the whipping does not occur.

[Brent60]

Originally Posted by rscarawa

It is my theory that when the mds is active, slack develops at times in the chain then it whips against the chain guide. I suspect that with the balanced nature of v8 cams, in v8 mode, pressure is even and the whipping does not occur.

Ah see there we go ^_^

Sent from my HTC Rezound with the AutoGuide App.

[STINGRAY]

Originally Posted by Yahooligan

There's no possibly about it, all SRT8s come from the factory with synthetic oil.

Mobil 1 synthetic? or which brand and oil weight?