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 > Hemi Camshaft Failure Mystery Explained

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jerem0621

Tennessee

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Posted: 05/31/20 12:06am Link  |  Quote  |  Print  |  Notify Moderator

Somewhat of a mystery over the years has been these random roller camshaft failures in modern Hemis. Uncle Tony just made a video explaining his findings on the issue.

If you are interested here is a Link

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Jeremiah


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Sportsmen

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Posted: 05/31/20 07:30am Link  |  Quote  |  Print  |  Notify Moderator

Lots of You Tube videos on this.. All the previous You Tubes that I have watched pointed to roller lifter failures. Seems like this guy may have found an underlying issue. I know this has been a problem on the 5.7 but not sure about the 6.4

* This post was edited 05/31/20 07:46am by Sportsmen *


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azdryheat

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Posted: 05/31/20 11:04am Link  |  Quote  |  Print  |  Notify Moderator

I've built a few engines in my time and this guy makes a whole lot of sense. Ain't no way I'd ever have a modern Hemi, which, BTW needs to be recalled and replaced. The original 426 Hemi was bullet proof. I don't know why Dodge didn't just repeat that design in a smaller engine.


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dodge guy

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Posted: 05/31/20 01:22pm Link  |  Quote  |  Print  |  Notify Moderator

Being a Chrysler tech. We have a lot of Hemis come through the shop. We only do about a handful of cam failures a year. I do agree that it’s bad design. I haven’t watched the video but I will. I think it’s about Physics and the angles between the cam and lifters.

I’ll watch the video and post what I see that he sees and what I see.


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BenK

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Posted: 05/31/20 03:14pm Link  |  Quote  |  Print  |  Notify Moderator

Like that guy !

This is exactly why we always had the interns and new, young hires teamed with an old time physicist...and coined green light/red light designers. This guy will know much more and/or be able to figure things out a super computer won't find...until they reload a new DB that has 'that' metric...but then the other stuff will have to come as they figure it out

Wonder if there is enough room for a spray system to shoot oil up there. Of course an electric pump with enough PSI & GPH to do the job. That used to be something racers who had the money would do...to both cool the piston bottoms and provide extra lube to those components. That is what Ford has done with the Eco gassers...wonder if the other OEM are likewise with their small displacement with huge amounts of boost do

Also, why I love Molybdenum Disuflide in all my ICE's. Even lawn mowers, chain saws, line trimmers, etc. It naturally plates a layer or more of Molyb on surfaces and if/when it goes dry...the coefficient of friction is still very low..pretty near what a dino oil film would provide


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hvac

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Posted: 06/07/20 06:33am Link  |  Quote  |  Print  |  Notify Moderator

It appears idling is what accelerates the failure. If so police applications must be experiencing high failure rates.

ksss

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Posted: 06/07/20 10:12am Link  |  Quote  |  Print  |  Notify Moderator

hvac wrote:

It appears idling is what accelerates the failure. If so police applications must be experiencing high failure rates.


That is true, incredible failure rates here locally. The 2011-2014 seem to be the worst. The local pd has auctioned off the majority of Chargers. The City mechanics are continually pulling these apart, repairing them only to have to do it again. Really something not right with this engine.


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FishOnOne

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Posted: 06/07/20 10:21am Link  |  Quote  |  Print  |  Notify Moderator

I visited a Ram dealer back in early March to look at some Jeep Wranglers and couldn't help notice that 50% of RAM HD trucks on the lot were powered by Hemi engines. I've never seen this many in HD trucks and this area is surrounded by farmers and ranchers who historically purchased diesels for the most part.


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dodge guy

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Posted: 06/07/20 11:55am Link  |  Quote  |  Print  |  Notify Moderator

ksss wrote:

hvac wrote:

It appears idling is what accelerates the failure. If so police applications must be experiencing high failure rates.


That is true, incredible failure rates here locally. The 2011-2014 seem to be the worst. The local pd has auctioned off the majority of Chargers. The City mechanics are continually pulling these apart, repairing them only to have to do it again. Really something not right with this engine.


We do work for a couple of towns around us. It’s not idling. It’s the geometry of the cam and lifters in relation to the pushrod/rocket arm. Also the poor quality roller bearings in the lifter. With the amount of Hemis on the road the failure rate is very minimal.

Grit dog

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Posted: 06/07/20 12:01pm Link  |  Quote  |  Print  |  Notify Moderator

FishOnOne wrote:

I visited a Ram dealer back in early March to look at some Jeep Wranglers and couldn't help notice that 50% of RAM HD trucks on the lot were powered by Hemi engines. I've never seen this many in HD trucks and this area is surrounded by farmers and ranchers who historically purchased diesels for the most part.


Prolly because they sold all the diesels and were sitting on the last 9 months of Hemi trucks! Lol.


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