Hey guys welcome back so tonight I have A Generac GP 7,500 e it's a pretty nice Machine electric start as you can see it Was well cared for it has less than 20 Hours on it and I got this for free and The reason for that is because it has Some sort of engine problem you know I Didn't ask too many questions You know but the guy did volunteer some Information basically he was running it At least the story I was told he was Running it sounded fine He went to shut it down and something Happened and it hasn't run since so I'm Going to pop the valve cover off and Pull the spark plug and just see you Know if the valves are moving if the Piston is moving and and go from there All right I mean offhand I do see that Both the rods are in place let me rotate The engine and see if they move all Right so the intake valve is not moving There's also no valve last year it looks Like I mean the intake is definitely Open and this rod looks like it's pushed Up so I don't know if it's just a matter That the rod may be popped out of its Place that would be nice so let me Loosen this up maybe take this rocker Off completely and see what's going on With this push rod So one thing I find kind of odd the if The cam was worn down that tap it I think it's called would be down
Instead it's stuck up not quite sure why That would be so I am going to try a Ping it down right now the exhaust valve Is open so the intake should be closed So I should be able to tap that down a Little bit Ya see that the pushrod just came up I'm Gonna keep going until the exhaust Starts to open there so I should rather Push this down freely and it's not Budging I want to get a better look down Here and in order to do that I removed The exhaust valve and you've got to Remove these studs next as well as this This guide However when removing this one I noticed Something right away which I didn't Notice on this side on the top here There supposed to be a metal cap which Is what the rocker pushes on so the Rocker doesn't actually push on the Valve stem directly and when I removed This rocker I could see that there was a Cap sitting right on top of this valve Stem that was not on this one so that Tells me that the intake was loose at Excessive lash and that cap popped off And probably went down and that is Probably causing our problem so I'm Going to continue on and get these out Of the way so I can shine a light down There and see what's going on All right so I have no idea where that Valve stem cap went I do not see it
Anywhere and you know when you look kind Of in-between you may not be able to see It there is an oil drain hole down there And that does not look large enough to Allow that cap through so the only other Place that could have gone is maybe into This engine breather which goes down Into the engine anyway so cut it back to Where I started I think I need to open The engine up I did run the magnet down Kind of in the sump where the oil is and Nothing came out no pieces which is good No carnage but no cap either so maybe It's down there maybe it's not maybe Someone took it out I know the previous Owner did pull this cap off so who knows But it's not here all right I don't know If there's any significance to this but This oil that came out has a very kind Of yellowish brown color I've never really seen oil that quite Looks like this so I'm not sure what's Going on with this oil and also all These little pieces of debris I don't Think they were in this pan before I did The oil drain the oil and you know I Took out a big chunk of it kind of Cleaned it up a bit and it almost looks Like like an acorn or something similar So it's not it's not definitely not Metal it's not magnetic fairly soft but I'd say an acorn or it got in there how I don't know maybe a little critter a Mouse but still in the oil not really
Sure how that would happen so I'm not Sure if there's any significance to this As far The problem with the tappet but thought I'd Document it just in case alright so I Already have the airbox off took the Battery out drain the oil and the gas so I'm just going to finish taking this Thing apart and just get it down to the Engine and alternator alright so I just Got that gas tank off but I see more Evidence here of a critter here is Probably the rest of that acorn that was Inside the engine you know I also see Other evidence here so I think I will End up taking off the blower housing at Some point in case there's more of this Stuff in there you know again I'm not Sure how this got in the engine but We'll find out Okay so what I wanted to do next is a Leak down test the only problem is I Don't have a leak down gage so what I do Have is a compression tester and with a Broken intake there's no way I can use a Compression tester because it won't let Any air in to compress so what I'm gonna Do now is pressurize the cylinder so I'm Using the compression tester hose and I'm going to just basically pressurize The cylinder and listen I'm also going To push the valve open under pressure And you should hear release pressure so
I'm going to try it on both sides I just Want to make sure that there is some Pressure build up this is where a third Hand would be very useful Yep okay good so we have compression Hey in those threads very nice I don't Know if you can see them but those are Threads I think in there so let me get a Few bolts and see if I have one little Fit not bad I'd say over an inch of Threads to work with so that's good I'm Gonna get a rod and cut it about a Quarter inch shy being flush here so That'll let me get this in about a Quarter of an inch before it starts Pushing the rotor off but getting ahead Of myself still need to get the stator Off all right so only one task remains Which is to get the stator slash rotor Armature off this shaft is threaded Which is going to make this a lot easier All I need to do is remove these bolts Is for going around and this one also Has bolts here which I think go right Into the stator to help keep it from Moving so those have to be removed then This plate might have to use a puller to Get it off that should slide out and Then the stator should slide out in the Rotor will have to pop off with a rod And we'll be ready then to open up that Engine okay so generally getting the Stator off is a pretty easy thing Sometimes they do put up a fight I'm
Going to start by removing these four Bolts There yeah so this is the muffler mount It's actually in the way of getting this Bolt out okay next I got to remove these Bolts for the engine mounts there's two Obviously on the engine side and there's Two on the stator side so actually once This comes out the engine will not be Supported properly so you do need to Support the engine usually with a piece Of wood kind of under the the engine Crankcase [Music] All right so just to show you what I did Here those mounts have been completely Removed from this housing and it's just Kind of floating you know supported by This piece of wood so now we're gonna Try to slide the stator out I still have These bolts in place which actually Sandwiches this housing to the stator so This whole thing should come off as one Piece if that fights me then I will Probably remove these I'm a little Hesitant because it's probably just a Nut on the other end here which is Either gonna spin and not loosen all the Way or it's just gonna fall off so don't Take these out unless you're sure you're Going to take the whole state or out so That you can put the nut back on and if It doesn't if it puts up a fight I'll Have to use a puller to separate the you
Know there's but this ball bearing from This housing There we go So the Broder looks in pretty good shape So now it's just a matter of getting This off and then finally we can get the The engine cover off and take a look Inside okay and in the past to remove The armature yeah I put a rod like this Down the shaft and tighten the bolt to Basically push against that tapered Shaft to pop this off and this is Already pre threaded so it should be Really easy to do that the only problem Is that the shaft here is a 3/8 inch Bolt and this rod is 3/8 inch so if I Use this there's a good chance I might Mess up the threads on that tapered Shaft so I'm gonna use this as a plan-b For plan a I'm gonna try a different Approach [Music] Okay so this is why I haven't tried this Method you really need to stand the Engine up just like this in order for This to work so I have written some Service manual as you can put oil down This shaft basically fill it to the top Put some teflon tape around that nut and Drive it down and it's basically Hydraulic pressure will force this thing Up and out so besides the fact you Really have to stand it up it's kind of A pain the idea of getting oil on the
Tapered shaft which is like a friction Fit doesn't sit well and you know Obviously I can clean it up but there's Still a bunch of oil in this shaft which I can't really clean that well and is a Bunch of oil down on the threads on the Tapered shaft end which also doesn't Clean up very well so I want to try this With water and if it works it's easy to Clean up you just blow some air down Here until it's dry so let's see if it Works All right so in order for this to work You need teflon tape and a liquid you Want to fill it to the top you do not Want any air or it will not work I would say that's a bust Try it one more time with a little more Teflon holy cow it worked With water All right so that worked better than I Thought you know this will be easy to Clean up just gonna blow it dry and no Damage to the threads and no messy oil To clean up so you know I haven't seen Anyone post a video doing something like This but um it worked pretty well my First attempt I hadn't put enough teflon In so it leaked out past the threads so I probably wrapped it around this time About seven or eight turns and can't Argue with the result The cam looks fine this is the intake Side the one that's not working and I
Don't know if you can see these but These are the tappets so this is the Exhaust one the one that's working and This is the one that's stuck and it is Stuck Nothing obvious wrong with it these are The same on the exhaust and intake so I'm going to try the exhaust side on the Intake and see if it goes in yeah so Something happened to this tap it so I Want to try cleaning it up see if that Makes a difference Wow So a little bit of carb cleaner and this Thing is free amazing ok so I'm kind of Beside myself at you know two minutes of Cleaning and this thing functions just Fine You know the gasket came off pretty Cleanly I could probably reuse it but to be safe I'm gonna get a new gasket a new oil Seal and I'm gonna order two new tappets Anyway since I'm in here I really don't See anything wrong with these but you Know they're basically five dollars each So I will get that it's a lot easier to Do that now while this is open then to Put it back together and have have it Stick again but the good news is that Functions really well and there's no Damage so anyway I'll turn you back on When I get the parts alright so today I Ordered the parts and in doing so I
Looked up the parts diagram and you may Notice may have already noticed already Only the exhaust valve has that cap at Part seven the intake does not so there Is no cap floating around inside of that Engine anywhere so you know I think it Was the problems we had were truly due To the stuck cam-follower or tap it and Once we put this thing back together it Should run without issue Alright so new tap it sit here just Gonna put a little assembly lube on and I get this case closed up Okay so now I'm just going to line up The timing marks there is one on this Tooth and then this big one here that's In between the teeth Okay good we're all timed on both gears They line up to the timing marks so I'm Just going to go over here with a little Bit more degreaser since I got some Assembly Lube on there and then I'll put The gasket on and close this whole thing Up Alright the ancients secure next for the Armature and stator Okay so a very important step is to pull The recoil with the spark plug out and Listen make sure the stator is not Making contact with the rotor you can Tell when you pull the recoil either It's not going to turn or it's going to Turn and you gotta hear scraping in here In this case I don't hear any scraping
There's no resistance I say so I think I'm good to just finish torquing down These bolts and I'll just check it one More time All right just going to do a quick Compression test this does have a Compression release valve so you know I'm not expecting to see anything really Much above 60 but hopefully I can get Close to 60 yeah that's good You [Music] All right so now for the moment of truth I have not tried starting this yet so I'm really interested to see what Happens And yes that breathing is my dogs not me Assuming it runs well you know I'll Check the Hertz and adjust it as needed [Music] All right so it started pretty easily it Sounded good Engine speed actually was good I did not Need to adjust it so I think we're done Here I hope this video helps someone thanks For watching