Hard statring 830

I've an 830 pony start that as never started like some other two cylinder diesels I've worked with. Most two cylinder diesels seem to start almost as soon as the throttle is moved into the fuel or run position. This tractor needs to have the throttle moved to at least half throttle and lately to full throttle with extended cranking time (2 -3 minutes).

As it cranks there is no white smoke, and when it does start there is just a whiff of black smoke. Once running it runs great, idles at 500 rpm with no problem, revs up with no problems. Shut it off and attempt to restart right away and it's a long crank time again.

My first thought was that I had air in the system. I've removed the covers and can find no evidence or leaks or fuel dilution in the oil. Fuel rack is set to '0' at stop, and '12.5' at full throttle.

I've good fuel and new filters, including the screen in the sediment bowl. I resealed the lift/transfer pump. There is 10 -12 psi at the filter pressure check point when cranking, and 24 - 26 when running.

I've come to the logical conclusion that the engine isn't getting fuel, but I can't figure out why. Any help would be greatly appreciated.

Merry Christmas to all,

Mark
 
Got me stumped ? even worn out ones seem to start as soon as the decompression is released and the fuel turned on.
Maybe check the valve clearance and decompression settings ? and test the nozzles ?
 
Forgot to mention that I did do over the valve and decompression settings. The only thing I haven't touched are the injection pumps and injectors. But i can't figure how they would create this problem.

Mark
 
what if you pull start it, does it make any difference ? I'm thinking pull start may turn it over faster and make a difference. Try forth gear.
 
Is the rack gummy from old fuel. Move the throttle without the engine running to see if it moves from start, set throttle wide open and reach in with both hands and move the rack to see if it's free. Also, if the injectors have been rebuilt the pumps could be worn and not cracking the injectors.
 

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