Fratzog
Old Man with a Hat
I came across this and it peaked my interest because I have a 5.7 in the Ram. I'd particularly be interested in hearing from anyone who routinely services these engines and if they can verify what Tony is saying.
Cam and lifter issues, it seems, were also on some model years of the Chrysler 3.6L, too. We hired a younger guy for our heavy line shop. He was doing one and I asked about it. He said that apparently they tried to "cheap-out" on the supplier, for a few model years or something.
Apparently, there were some issues with the GM 6.0L pickup truck motors. We had a company box van that would need a new cam (and a few lifters with their plastic retainers) every 70K miles, as long as we had it from new. We had the cam retainer trays in stock! So obviously not a really isolated instance? One lifter would rotate a bit, causing a slight/different "tick", but it also lost a bit of power on the hills. ONE of a long line of GM cam/lifter issues over the past 20 years!
Thanks for the link!
CBODY67
Well into the eighties. Slow learner's/ another company did not fix it for them, over at GM.running the cams flat back in the 1970's.
NOT to forget the roller lifter 350s' valve lifter rollers that lost sections of the rollers, in the 2000s! We did LOTS of those replacements, yet the GM reps denied that there was a wide spread problem. Even when the evidence was abundantly clear.Longer than that 350cid Chev motors were running the cams flat back in the 1970's.
Dave
I came across this and it peaked my interest because I have a 5.7 in the Ram. I'd particularly be interested in hearing from anyone who routinely services these engines and if they can verify what Tony is saying.
I concur on your view regarding oil testing specs. I run Amsoil in all of my vehicles. It is tested to that spec (MS-6395 and others). I also use Amsoil, Wix, Napa Gold (I believe Hastings), Donaldson, Hastings or Baldwin filters, in that order. I have learned that those filters (by cutting them open after use with a dremel tool) are of superior construction in the number of pleats, structural construction and materials.I have seen numerous forum comments on the "best oil" to use. Almost never is mentioned Chrysler's requirement for their MS6395 spec. Most oils either don't meet it or don't want to certify to the spec.
What Is Hemi MDS?
A few things can happen that can cause this mechanism to break down, the most common of which is oil contamination (change your oil). When small pieces of dirt block the lube circuit, the lifter may not be able to change state, or the change may happen slower, or only partially. A common scenario with the MDS system in Hemis is where the ECM believes the lifter is engaged at higher rpm when it is not. Here, the internal pin that locks the lifter body to the plunger is still disengaged when the engine rpm goes up. In this failure mode, the roller follows the cam lobe, until it reaches an engine speed where it can't, and the roller crashes repeatedly on the lobe. Eventually, the lifter, roller, needle bearings, and the lobe surface become damaged to the point of failure.
I'd particularly be interested in hearing from anyone who routinely services these engines and if they can verify what Tony is saying.
One thing he says is that the runoff is too far to the side of the block to drip on the cam.Now that I've had time to actually watch the video, I'm not sure I'm following his logic? He starts out saying some of the lifter bores aren't fully lubricated? Right? Then he runs off complaining of a lack of splash lubrication on a roller lifter camshaft? It seems to me the runoff from the valley and lifter bores should be more than adequate for camshaft lubrication? What did I miss?