OK, this brings about a question. Could the post-2009 5.7L engine be modified to accept the pre-2009 timing chain...and at what cost?
I know the Manley aftermarket chain set that is sold for the 5.7L will not fit and it is similar in width to the pre-2009 chain. You have to modify the timing chain cover and shave down some nuts and bolts in order to customize it to fit. From what I hear, one or two have done it.
Some have likened the post-2009 timing chain to that of a bicycle chain and they aren't too far off with that description either as you can see in the picture above. You can also see how the chain broke and the stress of it being pulled apart. It would certainly be much stronger if the chain resembled the pre-2009 timing chains. So, that's a factor right there. But I think there are other factors at work as well, like MDS, driving in the 70 mph range for periods of time, etc. The information that is collected by people coming in here and reporting a timing break will help to possibly identify the root of the problem.
Someone I believe was on to something. All of those Chargers the cops are using get run WAY harder and for many more miles. Would be nice to get stats on those. I was talking to a sherrif in AZ and he said the cruisers there are basically run for 24 hours and retired at 150,000. If it was a wide spread problem, would PD's still be buying the Chargers. granted this was 2010, so he possibly was running the 5.7 with the larger chain.
So, would the (pre)-2009 chain, cover, pulley, etc. fit on a 2009+ version? Just replace the whole shebang!?
Enitrely different set up. In fact, there was a known issue with the tensioners on the pre-2009 engines and why Chrysler redesigned it to what we have now, a spring loaded plunger type tensioner. Even if you could interchange the two, I'm not sure that you'd want to.
Originally Posted by RoostKing
Someone I believe was on to something. All of those Chargers the cops are using get run WAY harder and for many more miles. Would be nice to get stats on those.
Yep, yep. However, I haven't seen reports for the 5.7L Chargers, 300's or Trucks. It seems to be only the 5.7L Challengers with the automatics so far, which I find odd myself. It appears that we are receiving two reports a month now and, according to Luke, the "weekly" dealer call for timing chains is now up to 20 from 18 when this thread was first created.
Originally Posted by quickrt
Since the new 392 is based on the 5.7 I wonder what they did for it? It certainly has more HP. I wonder if we could adapt thst set?
I think the 392 uses the same timing chain. I would suspect, as they come up on miles, which shouldn't be too long now, that we'll see some reports coming in from them as well, and if we don't, then we can further narrow down the problem getting us that much closer to a solution.
I didn't think the 6.4 had MDS? Since the 6-speeds don't have MDS and aren't showing signs of failure, and if the 6.4 doesn't have MDS then I don't think we'll be seeing the 6.4s have timing chain issues.
Now I'm waiting to start hearing rumors that the police package 5.7 turns off MDS or doesn't feature it.
Enitrely different set up. In fact, there was a known issue with the tensioners on the pre-2009 engines and why Chrysler redesigned it to what we have now, a spring loaded plunger type tensioner. Even if you could interchange the two, I'm not sure that you'd want to.
Hmm, a spring loaded plunger, just like what's on my motorcycle. And guess what, the system on my motorcycle is known to cause issues. What happens is the the chain gets slack at some point and the plunger on the automatic tensioner extends a notch, putting too much pressure on the chain. So the chain stretches a little and the process repeats. Eventually the chain quits stretching and instead breaks. The way the problem is addressed on my bike is by ditching the automatic tensioner for a manual unit. I doubt this is feasible on these engines, but it sounds like another look at the tensioner is in order.
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