I stopped loaning out stuff a couple years ago after a neighbor borrowed my mower and destroyed the blade by hitting every rock and stump they could find. I've had several people ask since then and I will mow it for them but I have to say no to the loan. Nobody cares about my equipment like I do.

Sometimes Mustie we just don't know jack. I was thinking run away governor or the person running the machine wanted the day off. Thanks for bringing us along for the ride. With regards to loaning out equipment, I had a neighbor borrow a piece of equipment and had not returned it when he came asking to use my lawn mower. I have no problem telling it like it is. I said as soon as you return the equipment you borrowed 3 months ago I would consider loaning you another. He brought back what he had borrowed and I wheeled out a relic of a push mower. I told him that this is my cherished personal mower and that I expected him to return it in the same condition he received it. He pushed the mower across the street where his grass was almost to the point of needing to be weed wacked first. 5 minutes later I look out to find the mower sitting next to my gate. I looked over at his lawn and noticed a very small section cleared and realized he gave up. I try not to let the actions of one spill over to the other neighbors.

When "friends" ask to borrow from my large tool collection, I always tell them "You can borrow my skill saw but I don't have any usable blades - go to HD and get a new blade". Or sanding belts or router bits or whatever. Their response is ok, I will - and then I never hear about it again.

WHAT CAUSES THESE ENGINES TO FAIL: These Kohler Command v-twins fail because of a poorly designed oil pump. At 41:38, at the end of that tube where the plunger goes, there is a little metal cap that gets punched into place which falls out, and I'll bet you will find a little round metal cap somewhere in the carnage. With that cap no longer in place, the oil pump is unable to maintain pressure in the pump and there is no more oil pressure after that. I bought 2 Craftsman GTs from different people at different times, both had Commands with thrown rods, and both of them had that little cap fall out of the pump causing them to self destruct.

My father always said never loan out anything you can’t afford to loose.

Just opened my browser to find this vid only 6mins old! I can almost smell warm oil and mouse.. Happy Sunday Mustie and fans.

“Inner sanctum of doom”. That would be a good title for a new series. Thanks for the inspiration to fix things and not just kick it to the curb.

I love hearing you explain how all the parts work together. It makes sense when you explain and show how things operate together in the engine. Thanks!

My bet, is the motor was on it's way out, and someone gave it the full throttle send to small engine heaven.

You are a learning channel even when it's junk Parts are worth more than most would think

That was very helpful in understanding the chain of events that cause engine failure as well as the importance of oil pressure and cooling in the process.

Finally! I can teach Mustie something (some people can go a life time and never have that happen). On airplane oil filters, we cut the oil filter element at the edges using a case knife. Allows you to remove the entire element to inspect it.

Loaned my pressure washer to my brother-in-law who used it to clean out a horse trailer. You guessed it--he blasted all of the horse crap all over the pressure washer and returned it full of crap all over it. He's asked to use it several times since, but it doesn't run anymore (at least for him)!!!!

If I lend something to someone, it's already written off. Borrowers aren't using the same equations that owner-operators use. Generally, I'm standing there withholding with effort my judgement that I am being asked if I mind being used. I had a Kohler powered leaf collector and that engine was not only bulletproof but started on the first pull after sitting a season. Got a small yard, gave it to someone who broke it in two months! I felt I had let the machine down.

Getting to learn without getting dirty is great . Thanks for all your detailed tips.

I never imagined that someone cleaned a blown motor just out of curiosity, and the worst thing is that after all the mess we were left without knowing the specific cause of the failure🤣🤣🤣 After all, I learned a lot about an OVH V-Twin. Thanks !!

I see two young boys playing with the vacuum when Dad wasn't home. They like the "whirring" sound of the vacuum. One grabs the governor and holds it wide open. They smile and laugh. BANG!! Then their eyes and mouths become "wide open"...and they run. ;-) Whatever happened, it seems to have happened immediately. Except for the empty large end crank journal. That could have been starved of oil, for some reason, and was leading up to this over time. Try pushing oil through the crank and see if that oil passage is blocked.

"I was going to try startin' it". Pretty much your motto, you should get that printed on T-shirts...

I have a 40 year old Kohler generator set. Gave me many hours of power failure coverage, but in 2018 is finally died of old age. It has an oil pressure gauge, low oil pressure cutoff and high cylinder head temperature cutoff.

Those Kohler flywheels are notorious for rust-jacking the magnets off. I cleaned mine up, labeled the poles, and JB welded them back in place, with playing cards to space them all evenly. Worked great.

When a story starts " I loaned something to someone" it isn't gonna end well. Grrrrrr8 video 👍

Mustie wears a bright yellow shirt, tears down nasty dirty oily engine. Washes hands still has a bright yellow shirt. Me walks by dirty engine has dirty pants, shirt, shoes, probably socks...... Good times

Because of you, I find myself grabbing "blown" engines of all types to break them down for experience, analysis, and hording of spare parts. Keep 'em coming - we love them!!! Be well, Don

Thanks Mustie for brining me some relief from everything here in the UK. That engine is certainly a mess!

Hey mustie, I scored an 07 Honda ct110 for free with a lost key and unknown running condition. Bypassed the ignition and it fired right up. Bargain

I happen to like those V-twin motors. they don't have a particularly long service life. My son rebuilt one for his employer. it was on some kind of zero turn mower. had the block bored. they fitted the 2nd version of pistons as the original were no longer available. it cost !!!!! Those pistons really cost some coin. Then he found that both coil packs were flakey. He never did get the governor to work right. kinda sticky he said. but his employer didn't want him to spend any more time on it so it ran as is. It also loved to shake the carb loose from the intake. As for this engine. to me it screams a lubrication failure. the scoring in the cylinder on one side. the packing up of the throw on the crank. probably enough to cause the rod to let loose at top speed, maybe it was even running at overspeed. Those lifters even on the video you could see were packed in. probably the source of the metal that got into the system which probably aggravated the crank throw bearing surface. Ya, it ran hot. you can see how the oil was well burned . might also indicate poor maintenance schedule. Thats my unprofessional opinion. Ya I know, opinions are like belly buttons. everyone has one. I recall seeing those hyd lifters the first time. made me think of Chev V8 ( small and big block ) lifters. never did compare them.

I don't know why I keep talking to my screen like you can hear me..... always fun watching! Looks like failure due to lack of maintenance. Either a clog in the crank passage or heat or both. Truly proof why you should take care of your equipment.

My Sunday fix, truly appreciate the work you do. Gives me the motivation to get off the couch an keep wrenching. But, not till after watching the newest Mustie video.

Mustie CSI (Crank Shaft Investigator)

Discolored metal, cooling fins packed with debris, oil and oil filter never changed. Looks to me like it ran too hot for too long. Cooked oil that doesn't lubricate as well combined with the piston rings expanding too much. I think the piston rings temporarily seized, and when the engine cooled down the rings let go again, that's why the pistons came out relatively easy.

Thanks Mustie enjoyed spending time in the shop. Look forward to seeing what you do with the one that smokes.

Had a great time. Thanks for making the effort of creating these videos for our entertainment. I always enjoy the weekly visits. Cheers, Steve

Smashing teardown mustie :-D The trouble with lending stuff to people is getting them to bring it back!!.

I keep a junk push mower for those neighborly loan moments. The Honda stays with me....

I originally ran across your channel from my interest in old air cooled VW’s, but I’ve grown to love all of your videos. You have such thorough, informative videos. Somehow I wish I could instill your simple, “let’s see about this “ approach to mechanical situations to my 16 year old son. He’s always in such a hurry to just get things over with. He has made a comment that he likes your choice of tools, as he’s a Milwaukee tool guy. Keep up the good work !

Another Sunday treat! Thanks as always from your UK fans. Stay safe!

I guess that's what they call an Exploded View. Lol :)

Whether or not you discovered why the Koehler failed, it was entertaining. I was wondering if you blew out the oil passage hole in the crankshaft? My 1st thought was that it was clogged and was the reason the Rod journal seized. I agree with the idea of someone latching on to the throttle and over-reveled the engine until it seized and detonated. I also think most of us have a story about lending out tools and not getting them back in running condition. My new paint sprayer came back full of sticky red paint. I had to toss it.

Yep, loaned out my push mower and after 6 months I had to ask to get it back. Of course it would not start and had water in the gas tank and in the oil. Don't loan out anything anymore either. Also loaned my chain saw to my neighbor and then I find out he wanted it for a church member and it came back in pieces. I now just keep my stuff. You want something done and I will do it for you if I can. Just don't try to take advantage of my anymore. Great video.

My 5 year old son, Dalton and I really enjoyed this one! Thanks for providing his “home school” education lesson this week! Not even kidding, he loved it! His new fav I think! Previously he was hung up on re runs of the 41 farmall a tractor tear down...so maybe we can “move on” from those 😂 he can quote those word for word i think! 🤦‍♀️

re: your generator story. No good deed goes unpunished.

love the loaned out generator story I can realate I wont lend out anything with a motor anymore

I've learnt over the years. Don't lend anything out. Enjoyed it my friend 😊. Thanks for sharing 👍

Only Mustie can entertain us with a blown motor lol 😂 Fantastic as always cheers for the entertainment Stevie 😎🇬🇧

Always tough to figure out, in hindsight. Once in a while, it's Eureka! there's the culprit, but that's actually kinda rare. I suspect it had a hard life, relatively poor maintenance, and once the big end bearing started to grab, it just cascaded in the direction of disaster. Ah, well, there's a few usable parts in the corpse.

That leaf sucker motor looks like it has been well maintained. ...NOT!

Many years ago, I let a "friend" borrow a Sanyo top loading BetaCord VCR. He had custody of his 8 year old and 5 year old sons that weekend. When I got the VCR back, the tape loading door would not stay locked unless a heavy book was placed on top of the door. Never again!

Hey Mustie1 😎 thank you for the time you put in your videos I will be looking forward for next video 🤙

Yep, I've learned that you loan out equipment or tools only if you're prepared to never get them back, or at least not in the same condition you lent them in.

34:40 "...the more excited it becomes" 😂

Back in the early 80s, Cub Cadet started using the Kohler 17 HP in their mowers. This engine was designed for stationary use. they started throwing rods left and right. We found out two main issues. First, the oil pickup was only on one side of the engine, and when you mowed on a side hill, wth the pickup on the upper side, the engine would lose oil pressure, and throw a rod. The second issue, was the oil passage was machined into the case halves, and during assembly, and excess sealant on the case halves, would seal off the oil passage, and throw a rod. Most engines would self destruct within the first 50 hours. Most previous Kohler engines would run for 30 to 40 years before needing an overhaul. I short blocked them under warranty, and no more issues. On this engine, I suspect over reving.

Just love these tear down forensic investigation videos. I learn so much.

I think the rod siezed in the crank at combustion maybe and just crumbled. The other one similar but just threw out the side knocking the starter off. I think if you had thought to put the oil pump back on before removing the oil filter maybe you would have found the pump was hard to turn again. There was such a large amount of metallic load on the paper that maybe everything was becoming oil starved. The crank is the first customer and the first to get angry. That rod may have been failing and things just got worse because as you know as evident by super clogged airways the oil filter may never have been changed and lifters stopped rotating and then the weaker or further away from oil journals of the two rods began to be eaten away at and clogged the oil filter with micro metallic particles. Like you said maybe the old oil filter made them remove the wire to the oil sensor. Nice that they put that at the top end. If you still have that case and pump put it back together and try out the theory. Put a plug in the filter inlet. Or not. Thanks for the autopsy, got the old brains thinking and as always yelling at the tv and the wife reminding me you can’t hear me. I know but it’s fun! 😝. Keep up the great work. Hope you’ll give me your 2 bits.

That engine had a CRUD : Complete Rapid Unforeseen Disassembly

A nice change during these times. Thanks Mustie for the entertaining and educational video. Take care.

I thoroughly enjoyed that Mustie. I Love the way you talk to us viewers. I find myself answering you. Keep em comin.

I had an tractor engine one time with intermittent running problems... Turned out that it had a valve guide that would start to seize when it got hot. Once it cooled down it would be fine and made it very hard to diagnose. Given the sludge on the cooling fins, bent push rod and wear mark on the cam, I would have to say that valve guide was getting hot and seized which back fed into stopping the cam and crank suddenly causing the weakest link of the crappy aluminum rods to let go. probably kept running on the other cylinder grinding everything up till they could hit the kill switch

all that dirt caused overheating , especially of crankcase.Oil not changed enough and hot oil does not lube enough.add in possible over revving and you have instant disassembly.

Hi Darrin, so enjoyed the neighbor story,, thank you for sharing!

Yeah Mr. Mustie 1 so glad to hear from you. Seen so many of your videos I feel like a close friend Central California watching

"I learned not to loan equipment out" - that's the first lesson of owning stuff - your friends are not your equipment's friends, and they will screw things up - not from malice but from carelessness.

Mustie 1' "clean out the hole before you look at it!" God bless

For those wondering those are small block chevy lifters .We use to build those kohler command twins for our race mowers they are usually pretty tough engines

I used to live in an apartment 3 plex it was up to the residents to mow the yards, with the mower the land lady provided. Every time I went to use it I had to replace the flywheel key because someone would hit rocks rather than take time to move them from their yards. I finally told her i would mow the yards got a small discount on my rent took about an hour or so for me to do the job once a week

Ran warm from the crap in the cooling fins - oil gets thin and not as "luby" - lowered oil pressure and lowered lubricity caused the rod furthest from the oilpunp to fail. Just a theory. Does not explain the bent pushrod though.

The most important word in the english language when it comes to loaning something to someone - NO.

Great Vijeo Mr. Mustie. I needed this as a breather from the current unpleasantness.

Mustie. I really learned a lot from you about how to disassemble a small engine. I'm thinking of doing the same on my Kohler engine because the piston froze on it too! Now, I have an idea on how to attack this job. Thanks for taking time to explain the parts of the interior of the engine. I'm not a mechanic but I appreciate your approach on how you analyze what caused the motor to expire.

I had a mower that just quit running, would crank over but not run. sounded like no compression. I took it apart, the oil slinger came apart went between the cam gear and crank gear, broke the housing, cam stopped and held both valves open. got another engine worked mower another year. I guess 35 years for a mower is about the most I can get out of a mower.

Yea, that's when you know you've got a real fail, when parts come out the side of it. hahaha.

Loved this video. I could not see the cause as well. Nothing jumped out at me so to speak. My father always said "Neither a borrower or a lender be". Smart man my father.

thank you for the autopsy ... have to share, found myself giggling when you were opening up the oil filter...you were out of frame, but that didn't stop me from trying to look up and over the screen to see what you were doing....LoL

Been waiting patiently for this today!

lending a lawnmower or a generator is like lending out your girlfriend, they always come home rooted.

Yeah I got the same size generator your talking about, I've thought about letting a few people use it a few different times. But thought better about it. Glad that I did. And your story reenforces that in me! Lol Love the small engine autopsy!

As always, it's a pleasure to watch you work hope you and your family are well stay safe and well

Could have been a flaw in the rod casting... of course, there is always the "for no damn good reason" idea... that, or a voodoo curse.

Coroner's report: "Sumpthin messed up."

I just ❤️the way you speak to your audience encore

My neighbor asked to borrow my dad's circular saw. We should have been worried since we knew he didn't basic tools like hammers and screwdrivers. He came back the next day with a new in the box circular saw. He said "I wrecked yours, I'm very sorry, please take this." Turns out he just ran the saw over the power cord. The cord wrapped around the blade, but made a clean cut. So I just spliced it back together and it worked fine. He didn't know you could fix wires that that. Learning experience for all of us involved.

I also do not loan tools or equipment out. Can't afford the generosity . Have a sign in the shop "got tools, better not be mine"

I can't believe I just found your channel been binge watching for a week or so

I always love to look to see what happens when something fails. Great video Mustie 1.

My OCD is going crazy with all the unfinished projects. Here is another. Big fan Mustie1.

That engine died from pure abuse. Infrequent oil changes Overheating, from clogged cooling fins Low oil level, most likely run low, top off, repeat. The push rod bent because a valve guide moved up in thre head. If you remove the valves you'll find it. The other engine most likely needs head gaskets. Very common, causes smoking.

I dunno, should we have not dribbled a little gas down the plug holes and see it it will fire? 😂

I have mowed my neighbors yard for somewhere around 7 years now. It takes a hour and 15 minutes. I always take a leaf blower to the deck and engine when I’m done and check oil before I start it each time. The tractor is a craftsman 24 hp Briggs and a 48 inch deck . It’s previous owner used it about the same and it was born in 2006

I will never get the "TING TING TING...." Sound of my motorcycle engine blowing up out of my head, atleast I stopped it before the rod went threw the case, thanks for sharing

The old Kohler looks like it missed a few oil changes

My dad always said that there's 2 things that you never loan to a friend. 1. Your car 2. your girlfriend. Because they will throw a rod in both. Been there and done that girl didn't matter but the car got his ass kicked. Now I am going to make it 3 thing's equipment will be added.

Nice to watch you again Mustie. Clean the carburetor, you never know..

2 good things came out of this video: 1) a complete tear down of the engine so we could get a good look at the workings and failures of these things, and 2) I didn't have to clean up the mess. Thanks Mustie1.....!

34:10 Steampunk birdhouse.

I was once given a car: 4 cyl, 3 con rods but it still ran, so I drove it home... On later inpsection, at some point, one of the big end bolts had unwound itself (lock washer was never folded over the hex head during manufacture or rebuild?) and took a hike. The cap and second bolt bent, crank escaped the big end and then minced the entire con rod, as the now disconnected piston dropped down the cylinder. Eventually, equilibrium was reached and the piston stopped moving. I found that disassembly quite educational too, even though the end result was similar to your experience with this little twin...

Great forensics job on this. It is interesting to watch you think through the process. A throw away engine for you but very instructional for the rest of us. Im going to go change ALL my oil now...

I bought a repowered riding mower off my neighbor that had the " Courage engine " Now it has a Briggs. My neighbor said it had an oil leak when he got it, and eventually it hand grenaded when it ran empty...lol. So He and a friend repowered it with a brand new engine. I HAD to take look inside that Kohler and found pretty much what your video showed us. As for lending out equipment...not a chance. If you need to borrow something for a couple of hours, chances are the rented store will have what you need. Iv'e learned the hard way as well, that some people just don't care about other peoples stuff. Ruined it for others unfortunately. Great video as always.

"That piston doesnt feel very long" - Thats what she said

I think I figured out what happened to that engine- he must have loaned it to someone...

i keep looking at that huge snout on the dead crank and think.. i wonder what one could make out of that snout.. thanks for the tear down video.. you do need to look around for a tubing cutter blade.. to make a filter case cutter. decades ago.. my friend took a large pair of channellock pliers and drilled three holes in the sides of the jaw.. created his own filter tubing cutter with a pair of small ball bearings on studs and the tubing cutter disc on a stud. he did not try to tap the channel locks..

smartest man on youtube. Finally, someone that doesn't call this a "motor"..... Thank you .