 Hey guys today, we're going to be running a compression test and a leak down test on this old simplicity tractor I'll show you how to do that. Okay guys Now to use this tool See the end of it here So it's kind of like a air chuck. Now you're gonna have different Different sizes of these the fittings this one's the right size You can also use this a bigger size if you need to All you're gonna do is pull your spark plug out Which I've already got out here. I Did put the gap where it's supposed to be remember the gap was all screwed up on it so First thing you're going to do is screw this in to your spark plug hole Or you don't need any tools to to to tighten this up or anything like that Just screw it in Until it stops That's all you need to do it don't doesn't need to be super tight now we're gonna put this on here Just like this Then we're gonna crank this over for a few seconds Now another thing you're going to want to do Before you do this is make sure make sure you're on wide open throttle Okay, and and that don't just mean on these that don't just mean up here You're going to want your throttle wide open So what I'm going to do is I'm going to prop the governor open with something now what I've done I've stuck a screwdriver down into the Between the block of the engine and the The governor arm Now on a car you're not going to have a governor, but you still have to have that throttle wide open So if you want you can have someone hold it open you can wire it open whatever But make sure you're on wide open throttle and then we're going to crank it For a few seconds. We're gonna see what we can get this up to okay now I'm not sure, but I believe this may have It's a pressure release valve compression release valve Okay, so If it's got one of them I'm going to get a low reading on this that's why we're going to also do a leak down test But if it doesn't which this is a 16 horsepower I'm pretty sure it does But if it if it doesn't you know, I'm going to be looking I want to see around 90 to Anything over 90 would be super But let's see what we got here. You can go see that Bring you a little closer I'll try to hold it there watch it and crank at the same time It's looking like about 74 pounds That's a dry test now. We're going to do a wet test and take there's a little button here and push this button And that releases it so I'm going to put a little bit of oil in that cylinder and see if the compression comes up and Then we're going to do a leak down test Now for the wet test and that brought it up to 76. Okay Now we're going to do The leak down test Which I need to put this on top dead center And let me get my air hose out of here out here okay, guys I've got my air compressor set up to about oh It's about 104 So I wanted to be around a hundred so once I plug it in it should drop down now on these engines What you're going to want to look for? Lights nice and no Okay, what you're going to want to look for or actually you're going to want to listen. Okay, now what we're going to do is As you can see I took the gauge and off of there. That's what we're going to plug our air hose into Now you're going to want to listen and listen real close for air and there's three places you're going to want to do that number one It doesn't matter in any order you're going to listen for air coming out the exhaust You're going to want to listen for air coming out of the block and You're going to want to listen for air coming out of the carburetor So let's plug this in now a Lot of times When you plug this in your your engine is going to want to turn on you. Okay? Now show you what I've done. I've stuck a ratchet Down in here and over on To the crank bolt to keep it from turning so I've got it locked in there. So let's plug this in See if we can hear anything Okay Now nothing coming out exhaust a little bit coming out of here. Here's my main concern Remember I heard it like popping through the carburetor the other day. So I Think that's my culprit. I've got a little bit of blow by coming through here There's no doubt at 104 pounds That it's going to have some blow by because I know the rings the rings are probably worn a little bit I'm gonna be going in here shortly It's 90 degrees with a real feel of a hundred and five and it's supposed to get up to 95 regular temperature, so I'm gonna clean up my tools I'm not gonna pull the head off of it today because I don't have a gasket set to put it back together So that might be a weekend project Okay, guys. I just wanted to add a couple things to this video a lot of you guys might be saying well Why did you set your air compressor at a hundred pounds when you know it only had 76 pound of compression? Well, there's two reasons number one is I want it to be over 90 pound Okay, and number two Yeah, if it's gonna leak it's gonna leak at 80 But you may not hear it as well when you got traffic going by you got the birds chirping you're outside So I set it at a hundred just to be safe so I could hear it a lot better Okay, so that's why I did that now remember guys Like I said these things, you know have a compression release valve So that way like sometimes if you put a brand new battery in your in your little tractor Wouldn't start so you you put a new solenoid on still wouldn't want to crank and you put a new starter on didn't want to Crank but you pull the spark plug out and cranks over real easy That's because it's got it's got a lot of compression and engines have got a lot of compression I'm not sure exactly what it is Wanted to say nine to one I'm not positive on that but let's just say it's nine to one So that would come out to about a hundred and thirty PSI on compression so it might not be that much. I don't know That's an example now if if it's And it starts cranking over real fast that compression release valve might be bad What that does is these have a lot of compression because they have to have a lot of power. It's got 28.3 pounds of torque at 2,400 rpm so you know take some crush compression to do that kind of thing so It doesn't want to I mean that's a lot of compression, right? So what it does is when it's on your exhaust side when when you go to start it It you know your exhaust valve is opening a little bit to relieve some of that pressure. Okay now when it does that Okay, it's easier to crank and then once it Once it's running Okay It's kind of like it works on some centrifugal force That release valve is not is not working now and you're having full compression Now I'm not sure if that one's got one I would think it it seemed to me when I was checking the valves the other day It seemed like like it did have one it was working so that could that could be my low 75 psi, but that still does not Constituted a leak it shouldn't be leaking anywhere. You shouldn't hear any air coming from any anywhere And what that that little bit of checking we did there that thing dropped Down to 92 so it dropped 10 pounds or a little over Just in that a short amount of time So I didn't go any more from there because I heard the league now sometimes if you don't hear leak leave it on there Say for 10 minutes 15 minutes 20 minutes, whatever but significantly check your air pressure see what it's exactly on Come back say 20 minutes later check your air pressure again And it should be you shouldn't lose any more than like a pound Maybe two on an older engine, but if it's if it's in Excellent shape you're not going to lose any more than that should stay there that that thing lost 10 pounds or maybe 11 Just in that few seconds, so I'm guessing Weaver we either have a Crack valve It's a valve issue on the intake side Maybe a bent valve it could be a bent valve not causing to close it could still be carbon built up under there So but definitely we're going to pull the head off and check it out And go from there. I think the rings are okay There was a little bit of blow by but nothing to speak of nothing was coming out the exhaust at all so Anyway, I just wanted to throw that in there It's not real technical, you know, I'm not building a 500 horsepower 454 I'm not doing that It's a garden tractor, but I do want it to run right if I'm going to sell it because I don't sell junk You know what I mean? I'm not going to sell it to somebody unless it's right Everything I've sold I've sold Dozens of stuff out this little grudge and everything I've sold everybody has been happy with it So that being said I'm gonna get off here guys. I still try to cool down It's still 90 degrees Real feels still 105 and it is It's not even noon yet So but I've been out there since 930 so, you know, you're setting up the camera you're moving around you're getting your tools out and stuff like that Then you do your filming and you want to make sure you get the right angle So it does take some time, you know guys for us to make these videos for you guys so I know a lot of your you appreciate it and The other channels that you guys watch, you know, give them a thumbs up, you know They they work hard and we just try to do the best we can for you. We're not movie makers We're not filmmakers. We're youtubers man. We're just like you We're just guys grab a camera and film something and share it with you Sorry for the break in the video, but I just wanted to explain those things to you but we'll have more on it and I'll show you a complete tear down and We'll check the heads and show you how to put it back together That's a weekend project when I get the garage cleaned out and I can pull it in the garage and be a little bit cooler So all right guys back to the video So guys again, thanks for watching. I appreciate it It's hot out here guys, so I won't call it a day and go make some videos inside for you all where it's cooler So all right guys she bear The myth the man the legend don't forget check out monkey 1000 channel check out BXX 32 He's freaking awesome Ben. Thanks for the shout out the other day. You're great, man. Awesome job on your videos Love them, man so All right guys that being said I'm out man. I got I got to go inside so take care guys be cool