The 5.7 Hemis Are Having Common Major Failures, How and Why?

hey guys welcome to gearheads my name is Jesse and today I'm gonna be showing you guys a common problem with the new 5.7 Hemi motors and it's a problem that Chrysler hasn't really addressed or owned up to yet for some reason so the problem is the camshafts getting flat it's a major major problem for an engine and it's a pretty major failure and for some reason we're seeing it really often on motors that don't even have excessive miles on them I've done a few so far where the motor had one had less than 100,000 miles a couple more had low hundreds I have one here currently that I can show you guys and that one's at about 175 so sure it's got 175 thousand miles on it but you should still never see a flat spotted cam at that kind of mileage especially if it has been maintained and every single one of these vehicles that we've seen so far that this has happened to got regular oil changes every 5,000 miles with quality oil and quality filters and has also had the rest of the you know vehicle maintained as well so this isn't a lack of maintenance that's causing this problem it's a bad design in some part of the motor so I've got a couple camshafts actually here under my toolbox I'll show them to you guys and I have a lifter as an example and let's go over those and I'll show them to you and then after that's done I have a truck here right now actually with this problem and I can go and show you on the truck how to diagnose it and what to look for and just so you don't get it wrong because this is a problem a lot of people will take their truck to the shop so if you own a 5 7 Hemi or if you're mechanic and you're looking to diagnose a misfire and a 5 7 Hemi one of the newer generation ones the last you know 10 or so years we've got a P 300 code P 301 through 308 this might concern you so obviously first thing check your spark plugs make sure your spark plugs are good if you suspect it back coil we'll just move that over to another cylinder see if that misfire moves with it if it does not this is the next thing you're probably going to want to check unless you're suspecting a bad fuel injector but we haven't actually seen that yet at all every single time so far that we've had misfires like this it has been the camshaft and the it's more typical at least when it starts before it's gotten super bad it'll act see idle fine if you're driving around slow it'll dry fine but as soon as you try and put power to it and you step on it it starts misfiring check engine lights going to flash and ding it to you and you can feel it too it starts running pretty rough so anyways let me show you those camshafts I got into my toolbox okay so in case you were unaware I did not know this is what a camshaft looks like so this over here is the front of the camshaft and up here you have a sprocket that gets bolted on and that's what your timing chain goes to that goes also done to your crank and this is what keeps the motor in time and then running down the whole rest of it you've got these lobes you've got bearings that hold it in place that they spin on and but otherwise you've got these lobes and each of these lobes spins around pushes up on the lifter and when the lift arises it pushes the push rod up that pushes on the rocker arm and then that opens your u valves for your engine so the reason you get misfires when this happens is because the lobe gets flat spotted it's not pushing the lifter up all the way and therefore when the rocker arm gets engaged it's not opening your valve all the way and it gets worse the higher the engine speed is - so the problem becomes more apparent so let me show you what some nice ones look like and show you this one right here and what happened alright just ignore the dirt this has been laying out of my tool box so obviously one of this is in the engine it should be very clean and it's got oil running on it all the time so this is this is what they should look like you've got your lobe coming up and you know a little bit of a shiny smooth surface where the lifter runs on it that's not a problem this is ok and these all look ok so far until we get to this one right here so take a look at this all right so you can see on this one this is not near as smooth as all the other ones are and then you've got these big lips right here and if you will roll it over you'll see also that the lobe is nowhere near as long so if you compare with this one next to it that lobe sticks up real high this one's offset so it should be sticking up just a little bit to the left of this one here but it's a lot shorter because it's been ground down and the reason that this guy ground down is because of this lifter right here so this is a roller lifter this is supposed to roll smoothly and this why would you call this a roller cam this is supposed to roll smoothly along the surface of the cam lobe and when this goes up high it pushes on the lifter and these are hydraulic they have oil in them so they don't have ever have to be adjusted but then this here pushes up on your push rod and so forth like I already described up to the rocker arm now inside of here there supposed to be some needle bearings and you can see this one's moving around look at that play up and down in it that is not right at all this thing is supposed to sit right about in the middle and it's supposed to spin nice and freely this one's all rough it's got a ton of play in it because the bearings the needle bearings in here failed you also might notice the surface of it is all scored up real bad it's supposed to look smooth just like the good lobes on the cam do so the ultimate cause of these these cam failures on these new 5-7 Hemis ends up being the needle bearings in the lifters now why Chrysler hasn't addressed this with a TSB I don't know but it's a very common problem if you go on any forum you'll see a lot of people complaining about this problem with their truck and we see this a lot at the shop here that I work at and this has been the cause every single time we find we find the bearings and the roller here have completely you know disintegrated basically are no longer there and then you guys get this guy here just bouncing around probably getting stuck sometimes and ultimately does that and ruins camshaft so on this camshaft this happened on cylinder number four it's not necessarily more common on any specific cylinder I've seen it on almost all of them and these these engines actually don't even have the multi cylinder displacement so that brings its own issues these ones didn't even have that and they still failed let me show you another cam alright so here's another camshaft this one failed on cylinder number one so check out the lip on this one this one's real bad so this one ended up wearing down even further and shoving this metal up here to the side even higher than it did on the other one this is just an example same thing happened with this one had a failed lifter with the bad needle bearings in it that took out the whole cam ended up requiring a major engine repair all right well there's a couple examples for you guys explaining the problem explaining what happens next I'll go ahead and show you guys how to diagnose and how to confirm if this is actually what's happening with your motor or if you're a tech and you're looking at one of these how to find that out so you can properly diagnose this for the customer and luckily I had these things still sitting around to show you guys because I was planning on kind of just keeping a few around and making an art project with them but at the rate these things are failing I'll be able to build a damn skyscraper eventually alright so now we're looking at the motor under the hood now when these properties first show up if you diagnose it early it probably is gonna be happening on one cylinder we've seen it where it flat spotted multiple Globes on the cam but usually that's because that person had been running it for a while and it and they just ran through the first lobe and waited till it got to the second one and then the engine started running really poorly so then they brought it in either way you're gonna want to check your codes and see which cylinders you have misfires on primarily and you also of course like I said before you want to make sure that it's not an ignition or a fuel misfire so you know cancel those out first swap a coil over to another cylinder if you need to and then these you know the fricken chrysler engineers went to the school of redundancy school and there's 16 spark plugs because you got to with each cylinder so check your spark plugs pull coils out swap it over to another cylinder make sure your injectors or at least firing if you want you can look at your fuel trims and see if it looks like you know maybe maybe one banks running a little bit leaner you might have a fuel injector that's not firing or something like that but either way once those have been ruled out the next thing you're going to want to do is pull the valve cover off on whichever Bank is misfiring so on these Hemis you've got one three five seven on the driver's side and two four six eight on the passenger side this has a code of Pio 308 so that's a misfire code for cylinder number eight which is the very back one on the passenger side so I'm gonna pull this valve cover off real quick and show you guys what's going on [Music] alright this is not a how-to for pulling your valve cover off but I can tell you just remove all the electrical connectors on this side and get them out of the way take the bolts off take your coils out and this one comes out pretty easy the driver's side is a pain in the butt if you don't have the intake manifold off on these but that's another story alright so let me tell you what you're looking at here here's your rocker arms all along the top here you're going to be watching this very back one specifically at the top that's the intake valve for for cylinder number eight and these rocker arms when they're pushed up by the push rod from the lifter you know the custom the cam it's supposed to push down on the valve spring and open that valve up a certain amount I don't remember I thought my head exactly what the measurement is but you can watch watch this one and watch this one and see how much it travels and then watch the back one and see how much it's traveling in relation to those two it's a lot less so another tip when you're doing this I obviously have the coils off and I have the fuel injectors off or the fuel injector plugs off on this side I didn't even touch them on the other side and you don't have to if you get in the truck and you put the key on put your foot down into the gap you know on the gas pedal all the way and hold it there while you're cranking it'll do a cold flood Creek and it won't send spark or fuel and the motor will not try to start so either way let me go ahead and do that and let's see if you guys can see it alright so watch that back one there and you can tell it's not moving anywhere near as much as the two in front of it are and that's because the two in front of it don't have flat spotted cam lobes so they're getting the exact amount of travel they should be and those both look good also another good hint that you can tell from doing this cold flood crank test and you can do this before you even pull the valve cover anything else off so listen is the engines cranking over and you can hear the compression stroke is really weak on on one of them so you can if you listen just right you can tell it's like one two three four five six seven and then on the eighth one it's it's a lot weaker than the other ones are and that's another hint of what's going on here alright guys well thank you for watching if you have any questions or comments go ahead and drop them down below I'd be happy to answer them for you and if you have any other info telling you know tell share with me and everybody else why this happens if there's something you know that I don't I would love to hear it because it's such a common problem with these engines and I don't understand why this is not a normal thing with with most other you know v8 pushrod motors I never I never see this anywhere near to the extent as we do with these new or 5.7 Hemi so it's strange it's kind of a bummer and I really feel bad for a lot of people that bought these trucks because you know overall I do like the trucks and these engines are good engines when they run well they make good power and they drive nice but you know this is crazy there's no reason for these to be failing so early and so commonly on these things either way like I said drop a comment down below tell me what you think tell me what you know so if you liked the video please leave a thumbs up if you didn't like the video leave a thumbs down that's fine maybe your Hemi guy and you're just bummed about it because you have one I don't know I'm just trying to help and trying to show you guys what's going on so you can figure out your problems and diagnose these things if you want more content like this please subscribe we do how-to videos I've got tool reviews I work here in the shop and I can't really I do how-to videos on my personal projects I can't really do too many how-to things on stuff here in the shop though and as much as I'd love to do a how-to for a cam job on one of these it wouldn't really be a good idea because I have to work here and it's a professional environment and we got to get work done so we can get paid and videoing things take so much longer and you know either way I got to work so anyway once again I hope you guys liked the video have a good one and as always keep wrenching [Music] you [Music]

Channel: GearHeads

Views: 722,364

Keywords: gearheads, Hemi, Mopar, Chrysler, Dodge, Ram, 1500, 2500, 3500, Charger, Challenger, Truck, Camshaft, Misfire, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, Engine, bad, cam, lifter, tick, noise, pushrod, rocker arm, valve, issue, problem, fix, repair

Id: inPUz3pCHa0

Length: 13min 1sec (781 seconds)

Published: Wed Apr 10 2019