 Today we're doing a leak down test on a generator. We had oil all inside the air box here all down in there The oil level was low on the dipstick wasn't even really on it Checked compression had 195 pounds on the front cylinder 60 on the rear cylinder so we ended up putting our top dead center on the back and We went ahead and calibrated our gauge out We're using nitrogen as our compressed air set up here at a hundred pounds of pressure Our other side here. We got this unhooked. We calibrated out now. We hook up our hose to the cylinder And as you can notice right there We are leaking at about 95% You're listening now for the air is coming from I can hear the air down here in the crank case I do not really hear anything in our intake And I don't hear anything back here in our exhaust Now we'll go ahead and do a test here on the front one to show you what should have looked like And we're gonna go ahead and do this thing top dead center Extension in there something to So you see this one come up see this one go down Watching her come up Get her top dead center What I like to do is push on that because the air will actually shove the cylinder back down Get there at zero And there's what it should have looked like here. We're only losing about five 20% is the normal acceptable level our pressure coming in here is still right at 95 pounds the book says use 90 If I'm going off memory here, you're supposed to zero out your your leak leakage gauge And that's what I've done. You can hear a little bit inside there But obviously there's a tremendous difference between the leakage rate there at this point the motor can't really be repaired out in the field and Generally the cost to do that is going to be more than just replacing the motor. We ended up doing a standard compression test I had 195 pounds on the front cylinder. I had 60 on the back That's what led me to this test here along with the oil that was all up in the airbox the problem that we were called out for is over crank and that's where we were at and So now that it's failed you can look through here the results air escaping from the carburetor air intake check the intake valve Affairs escaping through the exhaust check the exhaust valve affairs escaping through the breather check the piston rings airs escaping between the cylinder head and block the head gasket should be replaced and check both Gasket surfaces, so there you go now I do want to mention right after checking the compression and seeing that it was that low I checked my valve clearance and I was Intolerance that's the front one which had good compression One that did not Today we're coming back to change out the motor and this is the motor as it comes So we're just going to haul this thing over there, which makes it a little bit easier Looks like the jug lug, but it's a $5 deal from Menards, so we'll get this thing hauled over there. We're gonna get the other motor Warmed up drain the oil out of it. This motor does not come with oil So make sure you bring oil with you when you go to change it because there's nothing in there Basically, we've got a strip all this off All over in here the end plate take the fan blade off the muffler I tend to keep me in a little dedicated toolbox for this. I Can't stress enough either use earplugs or something But after a while it doesn't seem loud at first, but this will cause your ears to end up bringing later and get tinnitus Which is untreatable That's something that I'm now dealing with don't know if it's from this or not, but I don't take a chance anymore As I said the motor screwed I don't want to get it too hot because they got to take the muffler and stuff off You can see metal shavings in that right there. This is why we don't try to fix this stuff in the field. It's not worth it So far we've got it disassembled We went ahead and put one of the bolts back in there to hold the lid so it doesn't fall down We got the oil drained out the books got everything piece by piece in there If you're not a Generac service authorized dealer, you shouldn't even be doing this So don't even attempt this if you're not one of those. I don't want any responsibility for you hurting yourselves There's my disclaimer for today You got a honking bolt there like that one right there. Don't lose that. That's where you need your polar on the end of that. I Picked up a cheap one from Harbor Freight That was easy. Got our slip rings here Make sure you pay attention to that positive and negative makes a difference Got to take these two screws out right in here if you don't you'll snap those off your brushes now speaking of slip rings When it gets super cold out on these older ones Sometimes those are freezing to place and they'll not make contact with the rotor and then next thing you know It won't produce voltage and it goes out on under voltage. Now. This is something you're definitely going to do by hand Otherwise you do it by your drill or something with your adapter. You'll possibly snap them bolts off The way I got into generators originally was I was bored with just doing old heating air conditioning And I thought hey, that's kind of cool something new without having to leave the field so We did a lot where I was at before We don't do a bunch of them here. And like I said you snooze you lose you tend to forget and although You know you got to go through the school every two years, which is kind of a crock Because they really haven't changed the design much the only thing they've changed is their electronics more than anything And they've changed the rotors just a touch But those are your brushes right there. That's how it transfers the DC voltage It spins creates a magnetic field catches the flux lines on the outside. You have voltage Basically, you got to put a bolt get a screw this in there. This is that same bolt that you had before Basically this one right here, but it's been cut off If you notice it's been cut off Well this piece right here is got a thread right there. So you're gonna thread this thing in first You've taken your hacksaw. You put a hack in the end of it So that goes in there Take your screwdriver you screw this thing in Now you're gonna use your metric bolt that you've got special Yep, there it is. I had to pick this up at like The Nards or Lowe's or something like that and then you're gonna tighten that dog up So you can do that with a crossing wrench or whatever. Okay, this little crappy toolkit here It's from Harbor Freight. It's metric once again. Like I said, we just don't use this stuff enough to really justify a high dollar set and So that just goes on there like that and that right there is a 19 millimeter I'm going to put my Back up wrench here, so we'll get on to a spot here that's not going to touch anything that way any gouges don't really hurt anything This thing will pop boom, baby. That scares the piss out of you back at puppy out of there Cha-bang and then your stator and rotor are all going to come off. Hopefully didn't screw my thing up too badly Now you can pull that back out unthreaded or you can leave it on there and kind of use as a guide as you're pulling the motor out Just kind of got to be easy with her. I have a dead blow hammer, which is not on my truck. I see so then This is where a block of wood Comes in handy See there we go. She's coming apart But there's your motor you can see right in the center there That's your spindle and Basically that comes out so at this point here. I'm just going to pull this off to the side get it out of my way I'm not going to go Taking things apart any more than what I need to mark this with your marker pen that way everything's lined back up Makes it a little bit easier All right got our uni strut here. It's just a standard piece. That's going to help lift the weight of the rotor up and kind of Help us to maneuver it so that we can get things in and out of the way basically Got to be careful because your leads Are right there on the end Don't want to rip those completely out all we need to do is Primarily lift it up and get it off of there. You can see right there is our Spindle that helped hold it up. This has rotated a little bit So we could have probably kept that together a little better been kind of nice So I just tap that back on here in a little bit I'm going to back that bolt out of there and Then the motor kind of start coming loose the battery gas all that should be Turned off before you even get started just pull that back a little bit further. We can then thread that bolt That we originally put in there There you go, and she's still in pretty doggone good shape. Hey, we want to get our exhaust manifold here off That came with a new gasket or at least we got one for it and See this little marshal of love see how they don't fit that's engineering at its best boys and girls The almighty PB blaster So if we can get it to creep in there The juice juice got her That stuff's wicked. I love it. He used to be a WD 40 fruit loop, but now I'm a PB blaster fruit loop Now this is where a ball and socket would come in handy, but I am not a big believer in the ball and socket ones They still didn't give you enough room To get it in there at a right angle So, yeah, you'd have to chop off about that much of it proper use of your tools There we go There's that Okay, I'm gonna need to unhook all of our safety switches here. So there's that that comes out You gotta get back here to the power plug going to the starter Get your choke solenoids now we need to get the Not off the solenoid And the ground wire down there on bottom Yep, if I remember correctly, these do not come off very easy at all just trim the bad part right off Just like new again. All right. She came right out Just took that around your shoulder like a jam box and Pull it right out. Yep. So basically right there is all that's connected to the motor Two wires for the oil switch two wires for the temperature switch the number 18 wire for your magneto grounding two wires to your Slip rings to your brushes grounding wire Start solenoid and two power wires there for power to the control module in the battery I believe and then you had your that really didn't connect to the thing to the motor But that was your choke solenoid So that's bought it Basically just reverse it now to get it back together. I Was correct. It does not come with that motor bracket to mount it to the to the base So that's got to come off, which is another good reason why you want to take all the oil out of this thing Right there's chunks. You can see it those shavings right there Are gonna be your rings Yep, that's your rings right there Wow, look at all the shavings in the oil filter there They are just coming out. That's This filter was just changed in May of this year. So this ain't like it's been going on for a while There's another piece of that ring. Holy crap Yep, she's jacked putting everything back together Got her pressure switches temperature switch Magneto all that's in there got her starter wires ground lugs battery cable all that's in place got our Servo control wire tied here to that limb Right here. Let's have a tendency sometimes to fall out Popped it off there. Got her back to here. Just rotate it get lined up There you go. It's back together. Everything's connected There we go First time haven't even started yet. Here we go We've checked the battery. We've checked the battery charger. We checked the starting amps We've checked the voltage and the frequency All of them seem to be right on spec with where they should be at So the only last thing I want to do is double check my oil level Gotta give it a second let it drain down. These sometimes are very hard to read which is why they got the double notches just below the notch we get a little drink and then We'll call her happy. I just leave that there for the customer because it's an air-cooled motor. It will burn oil Just supposed to check it every 24 hours So the manual says nobody usually does you don't want to shut down on low oil because damage could have already happened by that time That's kind of a failsafe look underneath make sure no oils draining out of the bottom of it Does not appear to be I'm gonna wire tie these wires right there There's it. All right, if you liked the video, please like share and subscribe Don't forget to check down in the description area down below And I'd like to take this opportunity to thank all my subscribers I really appreciate you guys taking the time to watch the videos. I try to make them worthwhile for you to watch and If you would I love comments, so feel free to leave something down below till next time. We'll catch you on the next one