Help! 284 won't start, throttle problem

   / Help! 284 won't start, throttle problem #1  

meporsche

Member
Joined
Oct 23, 2009
Messages
45
Location
Northern Tier of PA
I started the tractor this morning after shutting it down 15 hours ago. As soon as the engine caught, it started racing, with the throttle closed. I managed to pull the fuel cutoff before it got past 1700 rpms. WHen I tried to restart it, no fuel to the cylinders. Just spins over. I threw a little ether into the air cleaner to make sure the internals were OK and it caught and ran for a second or two.

I'm guessing something on the fuel cutoff broke inside? What the devil would break while it was sitting overnight to make the throttle control fail?

I'm sitting here with 8 head of cattle and two horses that need round bales and I have no tractor. Any help appreciated.

Thanks,
Darwin[
 
   / Help! 284 won't start, throttle problem
  • Thread Starter
#2  
Update*

After searching the web and these archives, it appears that I had a low oil level in the injector pump. I have refilled the pump but no success. I have looked again through both manuals, I see no clues about keeping this pump full. I, like others apparently, thought this was fed by the engine oil.

I am relunctant to remove the pump because of re-timing problems.

I am also wndering why I cannot get fuel to the cylinders by using the priming piston on the pump.

Can anyone help? I just had to roll a 900# round bale uphill 20 yards into the pasture.

Darwin
 
   / Help! 284 won't start, throttle problem #3  
Like you said a lack of maintenance led to a injector pump failure of some type. Your only option at this time is to remove the pump and replace. Since its already toast you may try marking everything and taking it off, tearing it down, and take a look to see if its something you can clean up and or un-seize.

Chris
 
   / Help! 284 won't start, throttle problem
  • Thread Starter
#4  
I'm not so sure. After I topped up the oil, I decided to go ahead and drain the pump to see what the oil looked like. I drained out about 20-24 oz, I had only added about 8. Doesn't seem like enough of a shortage to cause terminal failure.

I am going to try and fill the tank to see if I can gravity bleed the high pressure lines. I have lots of fuel on the low pressure hoses but nothing on the high side.

And after reading some stories of others, I am worried about installing a new pump and not being able to set the timing. If I set the engine to TDC and pull the pump, I'm not sure I would know how to line up the gearing on the new pump.

The manuals I have are a joke. And the inj pump in my parts manual doesn't even remotely resemble the one on the tractor. And going over both manuals, plus the dealer maintenance schedule, there is nothing, anywhere about inj pump maint. or service.

This tractor only has 56 hours on the clock.
 
   / Help! 284 won't start, throttle problem #5  
Check your throttle and shutdown linkages carefully. I have noticed that the two can interfere if the shutoff is pulled with throttle applied. Your shutoff may not have fully disengaged after the panic shutdown. The initial runaway may have been caused by your foot. I know i have done this inadvertently.

Not being able to get fuel to the injectors using the hand prime pump sounds normal to me. The injector pump pistons have inlet ports that close off the supply of fuel as the piston starts to build hydro pressure to send to and pop/fire it's injector. I would expect only one to be open at any given time. There is also probably a spring loaded check valve at the top of each pump cylinder that would further restrict flow. The hand prime pump is designed to get fuel thru the filter to the IP's feed pump and pump body. You really need to crank the engine with the injector fittings loosened to prime the high pressure lines. But this only works if the throttle and fuel cut are positioned to allow flow to the injectors.

On your IP body there should be a ring thru the head of a screw. If you loosen this screw and pump the hand primer pump and fuel comes out, that pump has done it's job IMO.
 
   / Help! 284 won't start, throttle problem #6  
What it sounds like is a stuck piston in the injector pump,they are small discs with a spring under them,one is stuck open thats why you cannot get the primer to pump fuel,the springs are under the head(where the hardlines connect) I don't recommend you messing with the injector pump thats up to you,if you remove the 4-bolts holding the head on you will see the springs and discs

Tommy
Affordable Tractor Sales
"Your Jinma arts Superstore"
Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company
 
   / Help! 284 won't start, throttle problem #7  
What it sounds like is a stuck piston in the injector pump,they are small discs with a spring under them,one is stuck open thats why you cannot get the primer to pump fuel,the springs are under the head(where the hardlines connect) I don't recommend you messing with the injector pump thats up to you,if you remove the 4-bolts holding the head on you will see the springs and discs

The small discs are in fact, check valves and they close at the end of the stroke of the pump plunger, to prevent pressure bleed down of the high pressure fuel to the injectors.

These fuel pumps have a governor attached and these regulate the fuel at full open. If these governors stick, symptoms similar to what you experienced, will occur. Flushing the governor mechanism and draining will often remedy the stickiness of the governor. Drain the existing oil out and refill with diesel fuel. run the engine for several minutes, stop it and the drain the oil again. You should see the dark coloured crap start to come out. Refill and rerun again - doing this maybe three or four times until the diesel fuel colour doesn't change too much. Then drain and refill with the appropriate lube oil.

Chances are this is your problem - but no guarantee. Still, give it a go and see what happens. Please report back so we can all learn a little.

Good luck

Jim
 
   / Help! 284 won't start, throttle problem
  • Thread Starter
#8  
OK Jim, I'm going to give it a shot. I can't run the engine of course but I am hoping I can achieve the same effect by turning the engine over for 10 seconds every few minutes or so.

I think that somehow, the governor sticking has mucked up the fuel cutoff. there was a post somewhere on here where the exact same thing happened to another. But the thread turned into an argument over the diff between kero and diesel and the solution was never posted.

I'm going to throw a Kats magnetic heater on it before I drain the pump oil, hopefully that will get more of the oil out before I fill it with diesel.

Thanks,

Darwin
 
   / Help! 284 won't start, throttle problem
  • Thread Starter
#9  
Well, I drained the oil in the IP again, got some more dirty oil out. I filled it with Diesel and turned it over for about an hour. I tried tapping the IP head with a hammer to try and free up the discs but no luck. I opened the drain and the diesel looked as clean as when I put it in. Ready to give up as I have no taste for putting a new IP on and finding out it still won't run.

Maybe I can trade it for a Ford 9n if I offer to throw in cash and my oldest child. But I'll never find anyone that stupid.
 
   / Help! 284 won't start, throttle problem #10  
Take the top part off the pump, worst case you are going to need a pump anyway,you may get lucky and get to free it up


Tommy
Affordable Tractor Sales
 

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