Rap 24 hp semidiesel, second start attempt.
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- Опубликовано: 7 фев 2025
- This video illustrates what happends when these two stroke semidiesels run out due to too much oil in the crankcase. With my left hand, I block the injection pump, so from that time the engine run on lube oil only, no diesel at all. I have heard lots of stories about this from decades ago but this is the first time, to my knowledge, that it is captured on video. Luckily we had blocked most of the air intake prior to starting and ended at somewhat over 1000 rpm. Max operating rpm is 425-450. With full air supply, I would guess this engine would reach thousands of rpm and I could only guess what would have happened then...
The electric glowplug short circuited so we had to rely on the propane burner which had slightly low temperature. In this startattempt, we used an acetylene burner and got the glowplug bright red. The crankcase was, unfortunately, filled with too much oil so the engine was running on its lube oil from the crankcase instead of diesel. Still some trouble with the fuel injection, doesn't feel right when injecting diesel manually. 
Авто/Мото
Best engine runaway ever!
Balls of steel not to just depart stage left.
I'd like to see more on this?
At least it didn't launch a connecting rod into the next town.
😂😂
I've had to deal with a engine like that once only difference that it is seaced up and was used for parts (not including the piston head)
i have a hard time picturing a connecting rod flying a long distance at such low rpm
Lmao!!!!
@@djnautilus5074 They're excruciatingly heavy in these engines. Get them moving and there isn't much to stop them.
you just don't understand. This ancient motor is ALIVE AGAIN, he just really wants to work!
2 stroke on crack
Yeah he just wants to work
Sounds just like starting my car. Same starting procedure too
I don't hope the same braking procedure though.
lol
I had a similar event with a ruston hornsby running away on crank oil, the crank drain was plugged and the con rod splashed enough onto the cylinder bore to run away, luckily they have a decompression lever. Glad you kept it together.
Wow! Thats look very dangerous.
That was exciting! Can't wait to see the engine running normally. Got to move to the next video!
Well, it took the whole rest of the day to get the grin off our faces ;-)
Got to be one of the best old engine start ups on youtube,proper "oh shit" looks on everyones face,well done lads,post more when you get her running well,A+++
it is is always good to see our engineering history bought back to life-it is only those of us adventurous enough, and with the desire to experience how things were in the golden days of REAL technology , who can enjoy such fine machines-thanks for the film-and oh yeh a lot of the finest crazies i know wear clogs too!
Looks like a slightly more advanced Harley engine, but doesn't shake as much!
I love watching these things...so many times I've fired an engine not knowing what to expect and get that mix of accomplishment and terror when it starts doing things I don't want it to. Like running away and trying to walk off the pedestal. LOL....some other crazy things I've done...had a Chevy with a 396 and a bad bottom end, was looking for a way to destroy it for good and hit on the idea of taking the carb off and throwing gas directly into the intake with no restriction. I'm pretty sure that motor hit 10,000 rpm before it spalled out and seized. Scary. Sounded like it was going to suck in the entire atmosphere. I had a '79 VW Rabbit diesel that had a unique runaway condition...they have a gear-driven vacuum pump in the block where the distributor would be...the diaphragm in the pump was bad and under high loads (like uphill ramp onto the highway) the intake vacuum would overpower that seal defect and allow it to start inhaling crankcase oil. When it happened the sound of the engine would abruptly change, a lot more diesel clatter than normal, an incredible sheet of smoke behind me, then it would get a burst of power and wouldn't back down when I released the throttle. I'd have to fight it down to a near stop in high gear, then shut the motor off without pressing the clutch, that would finally kill it. Then when I'd get home, I'd find the air filter literally dripping with oil, and the oil level would be around 2 qts low. It was kinda scary and yet fun in a weird way. I finally rebuilt the pump so it stopped doing that.
I'm going to call major BS on the 396 running with no carb. Guessing you dont have a video of that.
More fuel does not equal more bang without more air, so i second the major BS on that claim.
REALLY? You guys are dipshits. Dump gas gas into an unthrottled intake and you get fire or rpm. If the intake, cam and exhaust will let the engine pull 10K rpm, that's what it will pull to. Any large displacement gasoline motor will run with gas dumped into the intake and even a moron knows that much...
@@painmagnet1 Glad someone got in there and set them straight before I had to. I'm not great with explaining things to folk who have no understanding...
@EATSLEEPDRIVE2002 You have no idea how close this was to a total disaster. If it hadn't been for one of two air intakes were totally closed prior to start, the engine would have revved to pieces...
When the piston goes up, fresh air is sucked into the crank case and when the piston is moving down, this air is compressed and eventually ports in the cylinder is opened the cylinder is filled with air. The excess oil in the crankcase were blown up to the combustion chamber.
thanks for posted this video. very interesting to see this phenomenon. there are thousands of videos with hotbulb engines on youtube. but this video is unique in showing one going out of control like this.
The CO2 extinguisher is a very good point, didn't think of that :-)
Those red bottles are not fire extinguishers, they are propane (note the frost on the bottles) for pre-heating.
I watched this video 157 times. Every time... It got better.
Great video on what can go wrong and how to keep calm and correct the problum. I had a Le Roi engine run wild with the crank handel still on the flywheel in my shop. It walked all over hitting other engines and throwing the crank handel threw the shop wall untill I managed to pull the magneto wire and stop it. I know what you went threw. Phil
Neat old engine. Glad it got under control before damage. A CO2 or Halon extinguisher would have been handy. Anyway, very nice old engine. Thanks for sharing your experience.
That guy has balls of steel.
Looks like a good engine for a trans arctic passenger plane. Smooth, reliable etc.
That engine weighs 5 tons. That is not going in a airplane 😂
That fella sure has some balls albeit they were on the fine line of being lost and gone forever,loves a bit of old school.
Bear-tastic. I like the way the video catches that moment of "sh*t, sh*t, sh*t, sh*t, sh*t!" How was your hand afterwards, I noticed you checking it out.
So weird finding a big Clive comment on a 9 year old video lol
@@xxAlexanderTheGreatx Why is it only now we're seeing this? I've watched this video a few times over the years (am a strange creature, but sure you understand lol) but never seen The Boss Bear's comment before...
@@danmackintosh6325 Same...
Thumbs up to you guys for man handling it and teaching it who the boss is.
VW TDI clean diesel demo.
gunthreadadapters.com bullshit
Most of that smoke is from the old as hell sump oil that they forget to drain.
The cleanest they can get
@@Koronzon444 It has no sump, it is a two stroke. The oil had collected in the crankcase where it shouldn't have been.
There are a small pickup pipe on the crankshaft, the shaft itself should not touch the oil (which it did this time). There are one air intake with one-way valves, not reedvalves on this one, on each side of the crankcase. The other one was blocked prior to starting.
Great video! Reminds me that during the 1970s when I worked on M-B automotive diesel engines, they all had a butterfly in the air intake which would swing shut in the rare case when the engine could start in reverse and run on crankcase oil.
@ElectronikHeart As on most two-stroke engines, the combustion air is fed thru the crankcase where the bottom side of the piston acts as an air pump. The crank splashes down into the lube oil and drops of oil follow the air into the combustion chamber.
I unashamedly admit, that would've freaked me out and would have probably jumped away...
Also, even though it isn't supposed to run that high it sounded surprisingly nice!
@mikeys205 Yes it did. It changed direction 3 times before it got turning over TDC. Same thing, only once, when we got it running normally. When the engine rpm stabilizes, I change direction by shutting down fuel injection at 2:58 and at exactly the right moment, 3.03, I give a couple of manual injections.
Yes, it is a kind og splash lube. A small amount of oil is fed to the crankcase and a pick up tube on the crank bearing is lubricating the bearing. Excess oil, usually in very small amounts, follows the combustion air and is burnt.
@ElectronikHeart The bottom side of piston traveling up, draws air into the crankcase through some kind of check or reed valve in the side of the block. As the piston travels downward the air pressure closes off the check and forces the air thru another set off check or reed valves, through the intake ports, into the combustion chamber. If the oil level in the crankcase is too high, the air passing thru is saturated with oil and will burn in the combustion chamber, until there is no more oil.
The dancing diesel engine
Rüdiger Hertel bounce and boom bounce and boom come on everybody lets shake this room.
rapping*
Kester you just made my day 😂😂😂
Watermesuns
Så himla bra , bland det bästa jag har sett på youtube på länge
Excellent video... Looks like a nerve racking experience: I can imagine you had to fight your 'run away to avoid the potential flying metal' natrual instinct when both air intakes were blocked and it wasnt slowing down!
@ElectronikHeart Diesel engines were not named after the fuel. The fuel was named after the engine. Rudolf Diesel lent his name to the engine long before there was a "plentiful" supply of the modern fuel being pulled out of the ground. At it's inception the engine burned coal, peanut and various other oils.
@TheElectricnoob This engine was not designed to run both ways and the crankshaft bearings would get limited lubrication if running backwards but the construction allows it to run both ways even if it is note wise...
Yes very cool under presure guys.
The C02 is a good idea. I am not a mechanic but I keep several CO2 fire extiguishers around the diesel machinery where I work just in case I ever have tio snuff out an angine. Runaways and fires do happen but I have been lucky and never seen one.
@SirGookster A PKP (Potassium Bicarbonate) dry chemical extinguisher WOULD make a hell of a mess. A CO2 (Carbon Dioxide) gas extinguisher on the other hand would only displace the oxygen and starve the engine out. The only caution I would advise would be, do not discharge the extinguisher noozle directly into the engine intake because the gas is extremely cold. Holding the noozle about half a metre away should be ok.
@SveinHaDD
Ok thanks
Strange there is no marks or holes for levels
habitually the old machines are very practical to use
@krehall actually judging from the air intake i think this is a two stroke. therefore no cams, and two strokes dont really care what way the crank turns.
@bigsonarn
It's a two-stroke engine- they can run just as well in both directions and are very easily reversible- a very important attribute in the application for which these engines were designed.
@SveinHaDD
I keep a Co2 fire extinguisher handy for runaways . Does not damage the engine just dsiplaces the O2 and snuffs them out.
@MultiBrac if that doesnt work, put in the highest gear and release the clutch while hitting the brake (if it's in a vehicle) to try and stall it. if not, the last resort is to open the cylinder to relieve compression in some way
That literally looks like 24 horses are trying to get out of there. Nice job keeping your cool and not letting it get away from you.
You're absolutly right. The one thing that prevented a disaster was that one air intake was blocked prior to start and the other intake was blocked when the rpm increased. If both intakes had been blocked 100% the engine would stop within seconds but we had some leaks...
Built in the days when men were men. I was expecting the flywheel to grind it's way through the air cylinder.
Beautiful to watch & scary at the same time.
Most of these engines should have a dry crankcase and they also have an automatic draining system but this one (as far as I remember, all RAP engines from this size and larger) need to have a certain oil level to insure crank bearing lubrication. Unfortunately, we added slightly too much oil...
We used about 6.5 bar/95 psi which is quite a bit on the low side. I believe the pressure should be about 12-14 bar/175-200 psi. Normally the start tank is filled by leaking a bit of the combustion pressure into the tank after the engine have started.
wow. congratulations on getting it stopped. That was the scariest thing I'd ever seen.
These kind of engines were widely used for ship propulsion in most of the previous century. They also were used for sawmills, electrical power plants and other power demanding uses.
Looks like you fellows have your hands full.
Very nice engine good work!
Ride 'em cowboy!!
yeeeeee haaaaa!
looks nice and safe anyway, with all the gas lines getting tangled and the engine on top of them. top stuff.
Still one of my favorites on You Tube
@druszan17 No, it is a buffertank for start air. The acetylene tank is stored properly in the cradle at the right side of the engine.
Ive honestly never seen an "angry" machine like this before. That thing cobbles around like its weighs nothing. Youve got nerves of steel operating that behemoth thumper.
This is just hillarious (as well as interesting). Bouncing around all over the place - and the guy uses and acetylene torch to heat it up to start it!
24 hp paint shaker
true
Lên đường bình an
Very violent, I hope everybody had their steel toed boots on :)
@ponpatec you can hear it rub through the yellow line when the hissing sound starts!
@SveinHaDD ...the oil level can be an overlook so to speak, but the point he tried to make about the way the engine is mounted is a very valid point. That oversight could have resulted in a severe injury. ..and believe me I work on machinery that's much heavier than a food processor...:) but a cool old engine nonetheless, and good job at shutting it down
I witnessed a Cummins 350hp genset throw a rod and then run on it's engine oil. Tach read to 3000 and was pegged for over ten minutes until the crankshaft siezed up. Runaway diesels are scary at best.
+SMOBY44 I have seen a few diesels try to run away at the shop I work at. I keep a thick phone book close if we suspect one might cut loose. Killing the air supply is one of the best ways to stop a run away, unless you take the safe route and just run for dear life lol.
+Andar Lucifer Unfortunatly this engine was on a Navy ship and the air intake was above deck. Wish I had video of this thing eating itself but it was in '86 and not many video cams at that time.
+SMOBY44 My 91 7.3L ran away until I drove her into a lake. Water stops the engine quick.
I really wonder who they don`t add some kind of air valve when they put air intake out of reach. As if they don`t know this kind of shit can happen time to time.
EMD locomotives have an overspeed trip that locks all of the exhaust valves open until it is manually reset.
Its the pressure in the tank. The pressure in the cylinder is not that important, you need pressure to get as much air as possible into the cylinder in a short time.
When the engine is running, you bleed off a little of the exhaust in the work stroke to build up pressure in the start tank to prepare to the next start. So in real life, it is not compressed air that is used to start but compressed exhaust.
Just watching that flywheel rubbing and chafing the yellow air line...and waiting for that to blow. Compressed air can be wicked. That would have added some major insult to injury.
@michaelovitch Well, nobody knew how much oil there should be so we added some, too much obviously. When the engine is running, there is added a small amount of oil continuously and when the level is high enough, the engine sucks it into the combustion chamber where it is burnt. I believe this is not noticeable under normal running conditions.
@MultiBrac CO2 fire extinguisher down the intake works well. Dry powder and chemical do not, they will damage the engine further and may destroy a repairable one.
I'd be to scared to even run! I'd be rocking back and forth in a corner sucking my thumb crying ''It wont stop, it'll never stop''
hahaha that's funny
It goes to show how well older engines were designed
@angusandleigh There are over 100 comments here now that ALL comments engine mounting but no one seems to have noticed that it actually was NOT a problem ... Even when it does not go around but just swings back and forth it have a long way to go before it will fall over.
We did not know how much oil there was supposed to be in the crankcase but we filled up the pick up pipe on the crank, obviously it was too much...
Literally unstoppable
Keep a good sized co2 fire extinguisher around, & discharge it in and around the air intake.
@austinbrock112 it was in a run away. it was running on moter oil inplace of diesel fuel
Fantastic video and very informative too. Very brave to stick with it. you are lucky it did not flip on you. Thanks for posting it.
They must have expected something like in this vid: Starting Kromhout M2 30 hp hot-bulb.Notice the low speed and stability.
Semi-diesels can experience a runaway after several failed start attempts if not preheated enough. But they will settle down quickly after the flooded cylinder has cleared . The white smoke indicates it's ingesting copious amounts of oil through crank case intake port and the shaking and revving only helps it have more. "I say!" =)
fight of a liftime to get it stopping again haha, I had a small 2cilinder deutz engine that had a runaway, a spring in the dieselpump was broken, it scared the shitt out of me before I could shut it off :D, these moments give you the feeling your alive.
Could be but doubt it, I know Detroits are prone to kickback and run in reverse when their starters get worn out. But at least in the case of a Detroit when it runs backwards so does the airflow. It'll suck air in through the exhaust and blow smoke out the intake, if this one works similarly then the fact that smoke is coming out the exhaust means it's likely running the proper direction.
Bravo, you guys are extremely brave! I have a good idea how much that weighs and it was sure moving around on its own!
Health and safety officers showing how to operate and engine properly!
the beast has awake... This mechanic has balls from steal. I would run away while pissing in my pants :P
Pitchplus Acht ahhh fuck this shit
Pitchplus Acht yeep
i once had a kromhout 2 stroke in a small tugboat , it also ran away , in the middle of an busy canal , it ejected its smoke stack , old skipper told me later the flywheel will come off first , followed by the cyl head , flywheels of 2 tons will easily penetrate bulkheads , scared the shit out of me !!!
It’s alive!….!
Nice work! I wish you sucessful repairing of rare old engine!
THAT folks is a true handful!!!
Хорошо ,что все живы и здоровы. Никого не намотало
I see there's enough work in this world for me as a CE consultant.
@austinbrock112 At 1:29 I block the fuel supply by holding the governor piston to the upper position and thereby inhibiting fuel supply. From this point to 2:54 it runs on lube oil from the crankcase only.
@IrishEddie317 This is a very common type of engine used mostly for ship propulsion in most of the 20th century. Did it look rebuilt? No, it is just an engine that have been stored outdoors for 30+ years and this is the first time we got it running. Took a few hours to get the grin off our faces after this "ride"...
Seems to me it would have been a little smarter, and SAFER to have that sucker bolted down to something instead of just sitting on the ground. Very cool video, though. It's awesome to see these old vintage engines come back to life.
and thats why you have emergency cut-out valves, so your engine doesent run away for more time than it takes for it to drown itselv in the crude motor oil.
@MultiBrac and if you cant block the air intake soon enough run far away as fast as you can!
@MultiBrac Block the air supply should do the trick. We tried but there were too many leaks...
What a monster! Great video!
Why you didn't remove the excess oil of the cranckcase ?
@SveinHaDD c02 fire extinguisher also works if you happen to have one handy
You guys are very brave
Oh man thats freaky. Thats like your worst nightmare. If you only had sturdier foundation. But quick thinking saved you and the engine.
@EATSLEEPDRIVE2002 its a 2 stroke, it was flooding up the intake :(
good job keeping your cool! That's pretty hard when you have a monster like that on the loose!
@braydenraysdad These kind of engines were widely used for ship propulsion for many decades in the last century.
Look at that old gizzer just puffing away.