Common GM V8 Issues & 6.2L Truck problems

today first performance repair I have a 6.2 liter DOD motor from a yukon denali here and in pieces as you can see so i'm gonna go over a couple of things that are very good to know about not only this particular motor but if you're planning on doing a VOD delete or have oil pressure issues i'm just gonna cover some things why do i have the pieces laying here and available to look over i'm also going to cover something on oil consumption so stay tuned okay you can see i have the oil pan off i literally just pulled this oil pan off this motor because i'm doing a full delete on this vehicle now i'm gonna go ahead and look inside this oil pan add a couple of things one outside you can see it's obviously dirty but it doesn't have a thick layer of sludge on the bottom which is a good sign but we're gonna cover a couple things on this oil pan first before i do that let's get into why I had to pull this thing apart and why the dod was an issue so this one is one of those where it wiped out the canvas a cylinder one intake valve and the camshaft I don't know how well you can see that but it actually has a pretty nasty groove worn into the first lobe here another thing that I have noticed is the second bearing surface here there's a little bit of wear on the cam this is for the variable camshaft tighten to the variable timing part of the camshaft this is gonna lose a little bit of oil pressure in the vehicle the bearing has some score marks in it so it's got a little bit of wear more than what you would like to have and the bearings can be addressed in the vehicle as far as getting them replaced but this one is not bad enough that I don't feel it's necessary to replace if you have one needs to be replaced you're gonna have to pull the oil pan you're gonna have to pull the there's like a cover that splash and I forget what it's called the splash cover for the oil anyway yeah I have to remove that cover and then above the rods you cannot put the bearings with a bearing special burying tool and I'm not gonna cover that today but you could replace parents in the vehicle all the bearings except for the very last bearing can be done in the vehicle it's just if you have to do this one you're gonna have to do this one if you have to do this one you're gonna have to do all of them in front of it so you know it this one's in good shape so I would be able to technically do these two bearings and call it good if I really wanted to I don't feel it's necessary because I'm deleting the displacement on the man now if you have a little bit lower oil pressure than normal on these motors that's fine they have high oil pressure because they have a high volume pump in them to begin with so as long as you don't have a displacement on man you don't really have to worry too much about being under 30 psi but if you go under 30 psi the magic number is technically 27 at idle but if you start seeing under 30 or at 30 you're getting pretty damn close to the end of where your DoD is gonna fail pretty much guarantee so now why did that can get wiped out let's go over to the lifters here and I'll show you the lifter that wiped off the cam so this is a 9 b OD Lefter these are the two DOD lifters okay so you can see I have the lifters here and this one is tight I cannot turn it for the wife of me the reason they wear out is they actually rotate so this plastic guide fails and allows lifter to rotate it rotates starts rolling sideways on here chews up the cam some continues rotating then eventually it'll rotate so far that this oil hole is this direction now if you look here you can see a mark that mark there's from an oil galley that goes down this direction so if this oil hole hits that oil galley obviously it pressurizes that hole activates this lifter it collapses and that's why you lose compression on a cylinder so there's that one I suppose one more thing I'd like to mention about these things is the cam phaser so I am doing a delete on this thing obviously and I'm gonna be leaving the original phaser in here I will be cleaning this mortar I'll putting some cleaner and a little ATF probably when I do the oil change just to let it clean up ATF is a very high detergent oil so that's why I do that no this unit here if you replace this with a non vbt sprocket so you're gonna have to replace not only the timing cover but this gear here you need to make sure that these cogs are the same now the sprockets without VVT instead of being this weird wave plate it'll be like arrays two sections on it instead raised in empty sections so you want to make sure you have the same amount of not just to make sure that your cam doesn't throw a cam sensor code there's different versions of cam sensor triggers and you want to make sure that you get one that matches the one that's in your vehicle very important also the bolt in here whether you have a variable valve timing motor or not that bolt is a stretch bolt you need to replace that when you do any service on this system if you go into a three bolt cam instead which you can get a performance cam then then you also have to make sure you match the timing marks but at least the three bolt cams they don't have that single unused you know bolt that you can't reuse so now we're gonna get to oil pressure and oil pan scenarios since we already talked a little bit about oil pressure with cam bearing clearances and oil seeping out I want to make sure I comment on another thing related to oil pressure this little guy here a lot of motors have it but not all of them this is actually a pressure relief valve now why they have this pressure relief valve totally beyond me I have no idea why the hell they would put that in there I get it it's a high volume system but there's already a pressure relief valve built into the oil pump why not just utilize the one that's there and call it a day for some reason GM thought it would be wise to put one here this thing needs to be taken care of if you have so trying to look for a wrench here I'm gonna go ahead and pull this off in a minute but this guy here I guess there's a spring and a ball in here and they get stuck so you want to make sure you address this clean it up do the best you can to make sure that it's in good shape I just found these little pieces sitting here there's a little piece of RTV okay that's no big deal another thing you might want to do is just pop these bolts out and clean this pan out really good today mainly because if you replace this gasket you have to drill it out and if I drill it out I'm talking about these rivets right here so there's two rivets I should be wearing safety glasses if you do this wear some safety glasses but you can see that you have to drill these two rivets out in order to get the soil pan gas get off of there and when you do that a little bit of metal is going to end up in the pan and the sensors metal in there obviously I'm going to clean it out so I'm not too worried about it I'll zip these bolts up and clean the pan up it'll be good as new and I put the new gasket on I am NOT gonna waste the time even though usually the new gasket comes with a spot to rip it it on there again I'm not gonna bother rivet it or not it's pretty easy to slide the bolts in and keep them in place while you're putting the pan and into the mortar or on to the motor and you can keep from losing anything on the oil pan gasket there are little sections for RTV that are designed for it they're like these little goofy corner sections and these spots you want to make sure you dab with our TV typically I do it on both sides but I think you only really need to do it on the top side the top side is where you have a seam on the engine block make sure you get that seen from one cover to the block clean up really really well spray brake clean and there heavily get it nice and clean that way when you do put your RTV on there it is gonna seal up properly now let's move on to a oil construction on these motors and this is for not just the 6.2 by the way I got to mention that this covers pretty much every vehicle as far as what I've talked about so far I do have one more comment six to specific I'll leave for the very end because it's related to the camshaft but the valve covers no this is the one with the PCV valve built into it you can see the PCV valve here and it's kind of like built into this cover now this little plate here is they actually riveted on to the cover not with typical rivets but more or less the cover itself is molded with these little standoffs coming off of it so they set the plate on there with a little bit of RTV and then they take and smash these molded in or cast and features and it holds this thing in place the issue with these an oil consumption comes from this valve cover there's an updated valve cover that sealed off better and what it is is just a reglued version basically but these things will actually get leaks through the oil or the gasket material the whatever RTV that GM uses it the splashing from the rockers will end up getting sucked into there into the PCV valve you'll end up with an oil consumption problem so get the updated valve cover if you take the time to make sure you purchase that I'd be a very well worthy investment as for addressing the oil pressure end this check valve deal you want to make sure you pull this guy off I have not done this yet so we're gonna learn together with this now this is the part that must shoot the oil odhh I assume oh yeah there's a gap in here okay so it comes out of the side of this pressure relief valve shoots into this guy and pops out so let's go ahead and take a look at this thing it's the all integrated unit you can see we have threads here that deal there and then there's a basically a stamped to hold this little lid on here and there's a spring inside there so I guess what I would recommend is either replacing this thing if it's available I'm gonna have to look myself I have not looked if there's a replacement available I will go ahead and throw a link below or a part number or something related to this in the little description section so be sure to check that out just in case I have a link for it but if not if this is something that needs to just be cleaned out my suggestion I guess would be to put some cleaner of some sort in here pressurize it with air blow the relief valve make sure you actuate it a few times get it working and that way you can make sure that you take care of the system and get it cleaned up but if replacing it's a notch and that would be a much better option because I imagine the spring inside here could wear out so something to consider I'm gonna go ahead and just set this in here but I'll take care of it later I'll leave it nice and loose so I see it but this can I hear it actually causes very interesting oil pressure problems where you won't get above a certain pressure and your pressure will be slightly lower than normal but you will have pressure so you're like what in the world is going on you won't have air in the system it'll just be kind of working if you have a scenario where the pressure just does not seem to go as high as you would expect only climbs when you're at high rpm and it's sitting a little bit lower than you would expect this guy might be your your suspect these also have problems with the oil sump or ink failing but if that's the case you will end up with air in the oil and you'll see it fluttering with a mechanical gauge really bad fluttering and that's gonna be something that you can maybe check with a special tool like the one that I made I'll go ahead and throw a little clip of my video up right now so there you have it there's the oil it's blowing through there but I see absolutely zero bubbles whatsoever I mean so that tool is something that I made for myself so that I could check for different oil pressure issues on these motors and that's something that's that's probably a worthwhile investment for a technician to take the time and make something like that if they service a lot of these vehicles now for the last and final thing that I need to mention specifically on the 6.2 liter if you're doing a DoD delete Texas speed is a great place to get your camshaft source from however they do not know of and nor do I a direct replacement 6.2 liter where it's got the same lift duration etc but is non VOD camshaft so you have to go with an LS nine camshaft or maybe a six litre camshaft you have to go with a different camshaft that has different lift and duration and you may or may not need to do a tune it might run just fine without it I will find out at the end of this project whether it works fine without a actual tuner or not obviously you still have to turn off the system but I'm a little worried about how the feeling and and whatnot is gonna act with a little bit different lip if you guys felt this video was worth your time and energy listening to and you feel it saved you enough money or any other videos that I have perhaps be sure to check out my website if you have no other reason but to support me you can go ahead and pick up a shirt just like this one here and the only difference is you won't say owner on it right by the boob there but otherwise pick up a shirt it helps support me it keeps me keeps me rollin keeps me moving keeps me putting these videos forward and with that like share subscribe and as always I hope to see you on another video thanks for watching [Music]

Channel: CrazedPerformanceRepair

Views: 181,655

Keywords: 6.2 ls issues, Spun DOD lifter, DOD failure, crazed performance repair, Valve cover update, automotive technician, mechanic, engine building, engines knowledge, Oil pressure, Camshaft, pressure release valve, oil pan gasket, Chevrolet, collapsing lifter, collapsed lifter, how to, lifter noise, engine noise, engine rattle

Id: FhduQfq3iWw

Length: 13min 34sec (814 seconds)

Published: Sat Nov 02 2019