grm61
Platinum Member
detroit 4-71 in gmc 650 running away start after the 30 years - YouTube
Shook up the young kid pretty good.
Shook up the young kid pretty good.
How often do diesels "run away"?
- Thread starter Rock knocker
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Ilikeurtractor
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- Iseki TX1300F/TX1500/ TX2160F/TS2220F/ Satoh S370D/S373D
There was an explosion caused by a gas leak (I think a methane source) that entered into a diesel truck causing it to run away and explode similar to earlier examples in this thread a few years ago here. It was pretty ugly.
The thing that always amazed me is how good a diesel can apparently run off a flammable mixture coming through the intake although I haven't actually witnessed this myself other than cold starts off ether. One might think that the horrible timing of the combustion wouldn't allow it to run very well (extremely advanced?) but apparently it's not that much of an issue. I suppose once it begins to hit higher revs the advanced timing aids in going to higher rpms as long as the fuel and air supply are there to support it.
The thing that always amazed me is how good a diesel can apparently run off a flammable mixture coming through the intake although I haven't actually witnessed this myself other than cold starts off ether. One might think that the horrible timing of the combustion wouldn't allow it to run very well (extremely advanced?) but apparently it's not that much of an issue. I suppose once it begins to hit higher revs the advanced timing aids in going to higher rpms as long as the fuel and air supply are there to support it.
yelbike
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I remember as a teenager working in a marine dealership. The shop mechanic told a gas engine could diesel and overspeed as well. I guessing same way, aspirate fuel?
tlm720
Bronze Member
I had a bit of a scare with my JD720 after rebuilding the top end. I knew there was a possibility of not getting the governor connected properly and I still did it anyway. Had I thought about it ahead of time it would have been as simple as pulling the compression release. Instead I paniced and got stupid. Eventually I put it in 6th gear and killed it. No harm done other than to the governor. It tore the weights up pretty good after they flew out so far the lever arms came out from behind the thrust bearing.
Mechanos
Veteran Member
On an engine that doesn't have an air valve shutoff and has an intake arrangement that is not easy to get to choke off, there is another option... you can flood the air intake with CO2 from a fire extinguisher to starve the engine of oxygen.
MHarryE
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We had a problem at Deutz-Allis after introducing one of our first Deutz engined combines. Allis-Chalmers had only a vent hose for crankcase ventilation but the Germans with tighter environmental restrictions had a closed crankcase ventilation system. Sure enough the hydraulic pump we used had a defect that resulted in internal leakage that the flow path couldn't handle so the double seals both blew, hydraulic leakage got dumped into the engine, the level got high enough for the crank to really churn it to a froth that went through the vent system into the intake manifold and voila! The engines would take off uncontrolled. I ot to talk to one customer when he came to the plant to pick up his new engine. He said the engine just started screaming so he knew something was wrong. He went to the ack, opened the hood and that really scared him so he ran as fast as he could to get away before it exploded. Fortunately instead of exploding the engines either seized from the heat generated or died because the oil mixture got too rich to burn. Beginning of harvest season in the corn belt so talk about a crash redesign to remote mount our old proven belt drive pump.
Baby Grand
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Someone on here had a runaway after his tractor tipped over and it started ingesting crankcase oil. Trying to remember who that was. Got it :
http://www.tractorbynet.com/forums/kubota-owning-operating/179496-rolled-my-3240-ran-till.html
http://www.tractorbynet.com/forums/kubota-owning-operating/179496-rolled-my-3240-ran-till.html
Fan of the 1911
Bronze Member
I had a Detroit runaway backwards, it blew the water separator and the fuel bowl off of the side, and started to run off of crank case oil. I jumped on top of the cab and used my Kevlar to catch the flapper valve down on the exhaust and stood on it with one foot till it died.:shocked:
When it went wide open with that spooky wide open howl I almost wet myself.
When it went wide open with that spooky wide open howl I almost wet myself.
Scooby074
Super Member
That was awesome. Its wrong but I got a smile on my face. Laughed at the old guy,.. while the kids are nowhere to be seen, he walks over like "whats the big deal" and plugs her up.
Scooby074
Super Member
Heres another good runaway video. New or repaired turbos I think was the cause. Got to love the boss on the phone telling him to go shut her down... "I aint pullin that hood open"!! No kidding:thumbsup:
