JD 2240 Runaway engine, resulted from return fuel hose getting disconnected

   / JD 2240 Runaway engine, resulted from return fuel hose getting disconnected #11  
Funny how many "design flaws" crop up after 30 or more years. The first time the hose came off it was an accident and or a failed part. The second time it was due to an inadequate repair and inattentiveness on the part of the owner.
How about a little preventative maintenence including the replacement of dry, checked and failing hoses?
Sounds like the OP is going to Band Aid the engine repair and likely grenade it again if he doesn't get the injection pump checked out.

The common Stanadyne/RoosaMaster governor ring failure does not cause increased return flow; more commonly return flow is reduced due to debris blocking the return line check valve. I'm certain TX Jim knows this, I'm simply expanding on his thought.
 
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   / JD 2240 Runaway engine, resulted from return fuel hose getting disconnected
  • Thread Starter
#12  
OOPS, good arguments. It worked for 30 years, therefore nothing was wrong with the design of the tractor engine. You have a point. Big problem is, I am now being told that the fuel injection pump must have been at fault. Injecting more fuel would not cause engine knock! But mixing fuel with the air as it is drawn in will do it and that is what happened. Additional fuel mixed in with the air as it is sucked in by the engine, is compressed as the pistons travel up and will detonate (ping/knock) when the pressure gets high enough. If allowed to continue it will destroy the engine. In my first encounter, when the engine began to knock I reduced power and stepped on the clutch to unload the engine. And that was when the engine "ran away". I later discovered that the fuel return line connection at the tank filler neck had separated. After I reconnected the fuel return line the tractor ran normally again for years. The injection pump had nothing to do with it. The second time the fuel return line had slipped off again also. We reconnected it and the tractor started normally, albeit this time banging loudly inside the engine. I shut it down immediately. It was too late. I think the engine has thrown a connecting rod and has destroyed itself this time. All right you old coots, I'm 83 and have been around engines my whole life too. I went to school and got my mechanics license over 60 years ago! I know what I am talking about and when I tell you that this fuel return line needs to have kept an eye on, believe it. What's more, we need to tell everybody. When you have an engine running-away, if it is caused by an external supply of fuel, it will anounce itself by pinging first. (Injected fuel is timed to prevent detonation and pinging.) When you hear a diesel engine ping, do not unload the engine by pressing down on the clutch or putting the transmission into neutral. Throttle back, stay in gear, the tractor will slow down and the engine will stall. Now you will have time to investigate why the engine was pinging and you can take your time to fix what was wrong. :)
 
   / JD 2240 Runaway engine, resulted from return fuel hose getting disconnected #13  
I have to say fritza2tt is correct. Whether or not the fuel gets atomized makes no difference to this situation. Any fuel dumped in the intake will cause a possible runaway. Because it is not atomized is part of the reason it did not take off even under load, but it will still cause a uncontrolled burn and as the load is reduced the extra fuel is enough to let it over speed.
 
   / JD 2240 Runaway engine, resulted from return fuel hose getting disconnected #14  
OK.....
 
   / JD 2240 Runaway engine, resulted from return fuel hose getting disconnected #15  
Just aside here. Ford used for many years a cold start aid on their diesels which consisted of injecting into the intake a small amount of heated diesel. Worked not to bad but not as good as glow plugs.
 
   / JD 2240 Runaway engine, resulted from return fuel hose getting disconnected #16  
Just aside here. Ford used for many years a cold start aid on their diesels which consisted of injecting into the intake a small amount of heated diesel. Worked not to bad but not as good as glow plugs.

JD had something similar on the 1010/2010 diesels. It consisted of a handpump on the dash that one pumped raw fuel in the the intake manifold before trying to start engine. Some farmers ibn West Texas incorporated the same idea on 4010/4020.s by teeing into fuel supply line between lift pump & inj pump with a petcock and a line attached to intake manifold. Open petcock,pump lift pump handle a few times,close petcock and start tractor.
 
   / JD 2240 Runaway engine, resulted from return fuel hose getting disconnected #17  
fritza2tt[/quote]In my first encounter, when the engine began to knock I reduced power and stepped on the clutch to unload the engine. And that was when the engine "ran away". I later discovered that the fuel return line connection at the tank filler neck had separated.[/quote}

So If I'm understanding you correctly you reconnected the return line hose at the tank but didn't remove the diesel soaked air cleaner elements and engine immediately ran fine?????????

If your tractor(one out of 1000's of JD utility models built) did as you state I think that would not constitute a "design flaw"
 
   / JD 2240 Runaway engine, resulted from return fuel hose getting disconnected #18  
The common Stanadyne/RoosaMaster governor ring failure does not cause increased return flow; more commonly return flow is reduced due to debris blocking the return line check valve. I'm certain TX Jim knows this, I'm simply expanding on his thought.

Rick
Governor ring failure causes loss of speed control and over-speeding engine. Please explain your statement?? On all Stanadyne/RoosaMaster inj pumps I've worked on that the check valve was plugged the inj pump stopped pumping fuel to injectors because the pressure was too high inside the pump case. Therefore if check valve is plugged how would that increase pressure in return line. I've knocked the check valve out in the field and reattached line and cranked the engine. On Fritz's tractor that couldn't been the problem or the engine wouldn't have run at all.
 
   / JD 2240 Runaway engine, resulted from return fuel hose getting disconnected #19  
I watched my Dad deal with a busted governor ring in the injector pump on a D17 AC once when it ran away. When the OP says overspeed maybe he didnt get governor failure. The D17 was pulling a 14 foot disc in 3rd gear (it had only 4) and when the pump went wild the engine went wild. It was pulling that disc at least 25 mph down thru the field while Dad was trying to hold on and close the fuel shut off valve. I think the only reason it didnt blow the engine was because it had just been overhauled. That engine must have been turning 6000 RPM.
I dont think Fritz's tractor suffered governor ring failure if it died when he throttled back. It still may be something with the injector pump causing the overpressure on the return line though.
 
   / JD 2240 Runaway engine, resulted from return fuel hose getting disconnected #20  
Rick
Governor ring failure causes loss of speed control and over-speeding engine. Please explain your statement?? On all Stanadyne/RoosaMaster inj pumps I've worked on that the check valve was plugged the inj pump stopped pumping fuel to injectors because the pressure was too high inside the pump case. Therefore if check valve is plugged how would that increase pressure in return line. I've knocked the check valve out in the field and reattached line and cranked the engine. On Fritz's tractor that couldn't been the problem or the engine wouldn't have run at all.

My bad, you are correct. My error was in mentioning an overspeed condition, I didn't claim a failed governor ring as I have experienced would caused increased return flow or pressure. I agree that a failed governor ring does not match the posted symptoms, but the injector pump could certainly have another fault that should be investigated.
 

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