If we are talking about the solenoid operated oil control valve that switches oil flow on and off to the MDS hydraulic lifters, there were two on my 2010 5.7. They replaced both on mine, including the MDS lifters, intake & exhaust valves. They did not replace the pushrods or the camshaft.


If I recall correctly, the one earlier poster said they replaced the cam phaser along with the timing chain, guides, and springs and said the problem was gone. He hasn't checked back in to let us know if that repair was still successful.


By the way, I was running semi-synthetic motor oil in mine and when they had it apart I was amazed how clean it was. There was only a very thin coating of light brown oil residue in the heads and valley area. That was at 90,000+miles, too.


Bests,
Dusty

 

Unfortunately, they will not buy my truck back. I do have them mulling engine replacement however that will not reveal the cause of the ticking. They are now on repair ATTEMPT NUMBER 4.5. Guess what they are replacing this time, yup both MDS solenoids. Of course this wont fix it and soon we will be on repair *attempt* 5. I believe I have the only RAM (2009) with the lifetime warranty suffering from the chronic MDS ticking. My strategy is now to just keep taking it back over and over and over and over until they grow tired of it, replace the truck, replace the engine or possibly stumble onto a fix while shotgunning parts. I can afford this as all repairs are free and so I intend to make this my weapon. They have to put me in a loaner each time so I am OK with the 4 week repair average
I can tell they are getting frustrated now..... welcome to the club. This might be a dumb strategy on my part but I don't know what else to do so stay tuned folks.

 

A quick summary of parts replaced by dealer for my chronic MDS ticking. I will update after current attempt( in dealer bay now):

Repair attempt 1 - Select MDS lifters and pushrods replaced
Repair attempt 2 - All remaining MDS lifters replaced
Repair attempt 3 - ALL lifters AND camshaft replaced.
Repair attempt 4 ( current) - Replacing both MDS solenoids.

 

My bad if I led you astray. My ref to and depiction of the OCV is related to the solenoid operated oil control valve that supplies oil to the camshaft phaser to advance/retard the cam timing in relation to the crankshaft. There is only one. It is longitudinally oriented and located under the forward portion of intake plenum. Not to be confused with the solenoid operated oil control valves for the MDS system. Speaking of which, there are four (4) of those - one each to activate/deactivate the MDS lifters for cylinders one, four, six and seven. If they only replaced two MDS solenoids on your 10, how did they isolate those two as being suspect?

I’d contemplated replacement of the phaser but this component appears to be building a somewhat stellar service record. There is very little information available on failed phasers so I concluded that it was not a factor in this issue. My take on the ratcheting theory at this point is that it is nothing more than speculation, a WAG. A ratcheting phaser, even if only doing so by a couple or three degrees, will be flagged by the PCM as out of phase and applicable DTCs should be set. I’ve seen none of that.

Cheers,

Keith

 

Hemi, there are four (4) MDS solenoids. It’s been that way since MDS was introduced in the 5.7 and it's the same today.

Four weeks! That’s nuts! My latest adventure with the dealer (TC, tensioner, guide and VCT OCV) saw the truck go in on a Tues morning. I had it back the following morning.

Not dumb. Hang in there. Definitely staying tuned. If I’m gonna spend more money on this thing, I want to know that I’m not just throwing darts in the dark.


Keith

 

They said MDS solenoids so I assumed 2, likely they were referring to all 4 then. Pure guesswork from several mechanics standing at the service counter at that point. The mechanic who replaced the cam and lifters last time is surprised its back. I am not. I have little faith its one or all of the MDS solenoids but its their discovery process at thus point. I will update as I can. The extended waits were from parts shortages, the MDS lifters.

 

Boys I mentioned this earlier. I had to push and pull hard with dealer. Last resort was I finally convinced them to change the ting chain. Due to somone a few pages back posting an article that 5.7 l hemi having this issue in states. I said what the heck. Made them do it and ever since not a tick. This has been about 2 months now. Yes I had the lifters cyloiniods valves and all that junk replaced but the timing chain made sense . Now the dealer said every in thing looked great with chain and I requested to see part. They apparently got rid of it hmmmm. Anyhow chain replace and no more knock. I suspect same issue for you guys. Good luck.

 

Please do and much appreciated. Too much invested in this nuisance issue to let it go now.

 

Nope, I just recently did this - didn't work. The rattle/tick is as bad or worse than it was prior to having the TC replaced. For anyone trying to resolve this issue and unless you've got a lifetime PT warranty with an accommodating dealer, think carefully about this TC fix. It may be an issue in some instances but in my case (and I was convinced it was the TC) it was not. There's something else at play here - just don't know what it is... yet.

Cheers,

Keith

 

I have access to prodemand and after about an hour of searching I finally found the write up for the drone/vibration service bulletin. Looks like it was revised December 9th of 2015 which just happens to be the exact date I bought my truck, had to laugh at that one. Anyway here's what I assume alot of the technicians are seeing.







Doesn't say anything about a clicking noise and it states that this is only a concern at highway speeds but from what I have seen in the past is these TSB's are never %100 accurate when it comes to symptoms and customer concerns