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 Yanmar L100 Clone Teardown

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AllisKidD21
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PostSubject: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeSat Nov 30, 2019 12:03 am

Hello fellas. So I kinda got the idea to teardown one of these 10hp air-cooled diesels a lot of people are running, and document it in a thread here. Just thought that it'd be handy for some folks to see just what makes these things tick and all, since I don't know if there's much online covering the internal workings.

Well anyways, here it is:

Yanmar L100 Clone Teardown 20191160

Nothing fancy, just a 10hp genset engine. I was told it had a cracked piston, which was no doubt caused by a nut entering the combustion chamber at some point, as told by the heavy witness marks on both the cylinder head and piston:

Yanmar L100 Clone Teardown 20191181

Yanmar L100 Clone Teardown 20191173

Yep, that's not good! A couple hairline cracks visible, you can also see the swirl crater and the recesses for the valves.

First thing I wanted to do was pull the side cover, which is no joke because they have 16 bolts holding the thing on:

Yanmar L100 Clone Teardown 20191161

So I went to drain the oil and when I popped the plug nothing came out. But if I pulled the dipstick black diesel oil came gushing out. Well I got most of the oil out, yanked the side cover and found out just maybe why it wasn't draining:

Yanmar L100 Clone Teardown 20191163

Yanmar L100 Clone Teardown 20191165

Yanmar L100 Clone Teardown 20191164

Oh yeah, LOL. That's good stuff right there! Sludge in the bottom that like had a gelatinous form and the oil was just sitting on top. Yuck, haha.

Well got that cleaned out to some degree, still needs some but it's better than before, haha.

Yanmar L100 Clone Teardown 20191169

It has a single counter-balancer driven by a gear on the flywheel side of the crank:

Yanmar L100 Clone Teardown 20191170

Timing marks on both gears to time the counter-balancer:

Yanmar L100 Clone Teardown 20191171

After that I pulled the rod and piston. The rod is cast iron with bearing inserts:

Yanmar L100 Clone Teardown 20191175

Then I saw the full extent of the damage to the piston:

Yanmar L100 Clone Teardown 20191176

Yanmar L100 Clone Teardown 20191177

Yanmar L100 Clone Teardown 20191178

Yanmar L100 Clone Teardown 20191179

Yanmar L100 Clone Teardown 20191180

Wow, hahaha. She's definitely had 'er last. It's gonna make a dang good wall hanger though!!

But anyway, that's all I got to for tonight. Next I'll probably go into the cam, valve train, injector pump, etc. Just figured I'd put as much info in here as possible.

More to come!

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Last edited by AllisKidD21 on Sat Nov 30, 2019 9:38 am; edited 1 time in total
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Creepycrawler
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PostSubject: Re: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeSat Nov 30, 2019 7:51 am

thats crazy, I have one of these kicking around supposed to have bad rings wonder if the piston is just cracked?
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AllisKidD21
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PostSubject: Re: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeSat Nov 30, 2019 9:39 am

Haha, yep. Pretty wild!

Yeah you could be right about that, might be worth investigating.

_______________________________________________
"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
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Murraymountain
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PostSubject: Re: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeSat Nov 30, 2019 9:45 am

Dang, that's not cracked, that's what you call shattered! Must of been one heck of a nut...
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AllisKidD21
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PostSubject: Re: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeSat Nov 30, 2019 9:47 am

Well just think of the compression on a diesel though, that nut was in one seriously tight space!

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"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
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PostSubject: Re: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeSat Nov 30, 2019 11:42 am

Plans on rebuilding and running it?

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PostSubject: Re: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeSat Nov 30, 2019 8:40 pm

That's crazy. Thanks for sharing
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PostSubject: Re: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeSun Dec 01, 2019 8:18 am

Maybe that'll work in my yanmar, wanna trade it for a lightly used K181 con rod? Lol.
Pretty crazy to see that.
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AllisKidD21
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PostSubject: Re: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeSun Dec 01, 2019 9:45 am

Haha, yeah it's pretty crazy. The way everything else looks I imagine I could indeed install a new piston and rings and it's be good to go, but we'll see. I only bought it for parts though so I'm not too concerned.

_______________________________________________
"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
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PostSubject: Re: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeSun Dec 08, 2019 11:32 am

Alrighty, got another minute to tinker with this the other day so I figured I'd go over the injector pump and lower valvetrain.

Here's the cam and injector pump:

Yanmar L100 Clone Teardown 20191215

Then the tappets and push rods, both of which are the same length.

Yanmar L100 Clone Teardown 20191220

The center lobe on the cam is what controls the injector pump timing, there's a little steel cup that goes on the end of the pump:

Yanmar L100 Clone Teardown 20191216

Closer look at the pump:

Yanmar L100 Clone Teardown 20191217

The the threaded fitting directly on top is for the high pressure line going to the injector. Then the little piece with the needle at the end is the fuel rack, it swings back and forth and controls the amount of fuel going to the injector.

Here a a view of where the pump sits in the block:

Yanmar L100 Clone Teardown 20191218

The cast aluminum arm sticking up comes from the governor shaft and goes to the fuel rack. The little ball on the bottom of the fuel rack sits in the governor arm fork.

Yanmar L100 Clone Teardown 20191219

Finally the pump mount from the top:

Yanmar L100 Clone Teardown 20191221

It's held on with three 1/4" studs and nuts, and the shim(s) underneath is added at the factory to get the injector timing right. I believe is you remove a shim it will advance the injector timing.

Anyways, I think I'll take the head apart next and get a look at the valves, rockers, ect.

_______________________________________________
"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
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PostSubject: Re: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeFri Dec 20, 2019 10:45 pm

very nice tear-down, that is crazy on the damaged that is caused.
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prancstaman
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PostSubject: Re: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeSat Dec 21, 2019 12:10 am

Cool motor, on how it works. Any way that cast iron piston rod can fit into a gas motor? Be cool if it can since a cast iron rod is better then an aluminum rod?
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PostSubject: Re: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeSat Dec 21, 2019 12:15 am

@SteamNut247 wrote:
very nice tear-down, that is crazy on the damaged that is caused.

Thanks. Yeah, it sure wild!

@prancstaman wrote:
Cool motor, on how it works. Any way that cast iron piston rod can fit into a gas motor? Be cool if it can since a cast iron rod is better then an aluminum rod?

We must be the same level of crazy, becuase I've been thinking about trying that as well! LOL

I was gonna do some measuring of a K Series rod journal and wrist pin, and see how close we are first. Pretty slim chances it will fit without any maching, but it'd still be cool to try!

_______________________________________________
"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
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       - Toro Rat Rod Tractor Build
       - Ford LT 110 Off-Road Build
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       - John Deere 110 Basic Off-Road Build
       - Allis B-110, 710 & 716 - Wheel Horse 655 & 953 - Case 444 - Bolens Versamatic - Cub Cadet 106 - Ford LGT 125 -
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PostSubject: Re: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeSun Dec 22, 2019 1:02 am

Break that skirt the rest of the way off with a cold chisel and run it lol. Reduced drag short skirt piston just like that.

Despite being china juenk, that engine sure does look dead simple. Might not be as bad as i thought they were.
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PostSubject: Re: Yanmar L100 Clone Teardown   Yanmar L100 Clone Teardown Icon_minitimeSun Dec 29, 2019 12:27 pm

@RichieRichOverdrive wrote:
Break that skirt the rest of the way off with a cold chisel and run it lol. Reduced drag short skirt piston just like that.

Despite being china juenk, that engine sure does look dead simple. Might not be as bad as i thought they were.

you can do that but if you look at the crack it actually goes through the piston wrist pin also, so if you do that there would be no place to hold the piston on to the connecting rod, so the engine would not run period.
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