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Tractor Talk Discussion Forum

Priming an injection pump help!

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Ken Macfarlane

08-19-2004 06:23:29




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Ok our haying partners have a Case/IH 585, yesterday one of them finished tedding and noticed the tractor felt slugish so stopped it.

She asked me to take a look at it and it was out of fuel (saddle type tank with a bad transfer line so it looks 1/2 full on the filler side)

So I put some fuel in it and ended up replacing the fuel filters, blowing out the line to the tank etc to get fuel to run out the last drain.

I cracked all the lines to the injectors at the injectors and cranked away but nothing would come out! It has a Bosch pump and I don't see a priming pump lever to save cranking.

Please help!
Ken

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Mac

08-20-2004 17:22:20




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 Re: Priming an injection pump help! in reply to Ken Macfarlane, 08-19-2004 06:23:29  
Ken, it should fire in about 10 revs or so. If you do try cracking inj lines be careful. A guy down the road almost lost his finger to gangrene from fuel penetration trying to tighten line nut on a running JD. The 585 manual doesn't mention inj lines when it comes to bleeding, just supply side.



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NC Wayne

08-19-2004 23:17:01




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 Re: Priming an injection pump help! in reply to Ken Macfarlane, 08-19-2004 06:23:29  
Ken, your correct in the fact that if the injector lines have air in them it can, in effect create an "airlock" when the engine is only turning at cranking speed. It isn't so much an airlock condition as it is that the pump has to fill all the lines under pressure and force the air out thrugh the injector which is alot harder for it to do than if it's simply filling a line up and forcing the air out an open end that's not under pressure. Cracking the lines, or keeping it running on ether long enough for it to pick up (which isn't a good thing to do as you probably already know) is the only way to solve this. The pump will only send a very small amount of fuel to each injector each time anyway, so even with the lines cracked at the injectors it may take you a little bit to get fuel up to them. Now if your pump is old and worn enough I have seen them where ether was the only way to get them to run fast enough and build enough pressure in the pump to cause it to regain it's prime and fill the lines. Hopefully yours isn't in that bad of shape. Just make sure you don't burn up the starter trying. Personally I've never seen where bleeding one at the injectors made that much of a mess. All you have to do is crack the fittings and if your concerned about the fuel wrap a rag around each injector to catch the excess. Good luck.

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Ken Macfarlane

08-20-2004 05:12:50




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 Re: Priming an injection pump help! in reply to NC Wayne, 08-19-2004 23:17:01  
Thanks, the pump should be in good shape on this machine, it only has 1800 hrs. I'll get some fuel to the pump so it has some lubrication.

If the starter won't get the job done there is a fresh cut field and lots of road to tow it on!



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Mac

08-19-2004 16:51:42




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 Re: Priming an injection pump help! in reply to Ken Macfarlane, 08-19-2004 06:23:29  
Open first primary filter bleed screw (on right side as seen from seat)until fuel bleeds,, close, then do same on secondary filter on other side. Then crack banjo fitting at inj pump. Cracking individual inj lines doesn't do anything but make a mess. Once inj pump is primed, fuel is under serious pressure and will come out inj. Continuous cranking dry pump can cause pump plungers to seize. The only inj lines I ever crack are for tappet style which produce their own pressure.

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kraig

08-19-2004 16:56:52




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 Re: Priming an injection pump help! in reply to Mac, 08-19-2004 16:51:42  
go to the pump and make sure the shut off lever is pushing all the way back, and then tow it around the field spinning the motor, it will start. saves the starter and battery. put it in a higher gear not a low one.



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Ken Macfarlane

08-19-2004 17:47:35




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 Re: Priming an injection pump help! in reply to kraig, 08-19-2004 16:56:52  
I"ll loosen the banjo fitting to get it up to the pump, had bled everything to there, it was a fountain of fuel coming out the last filter bleed.

For some reason I thought if the injector lines had air in them the pressure shock from the pump would get absorbed in the air and wouldn"t overcome the spring loaded valve in the injectors?

Drug it out of the field to the shop tonight, will look at tomorrow.

Thanks!

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RickB

08-20-2004 06:55:04




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 Re: Priming an injection pump help! in reply to Ken Macfarlane, 08-19-2004 17:47:35  
You thoughts on trapped air in the injector lines are correct. Complete bleeding of the low pressure side first is a must though.



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Ken Macfarlane

08-22-2004 06:09:05




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 Re: Priming an injection pump help! in reply to RickB, 08-20-2004 06:55:04  
Got the tractor going. Had to bleed the supply side 3 times to get all the air out, had to crack the injector fittings too, was careful enough to leave em loose so the tractor couldn"t start. Let some fuel come out and tightened up, got tugged a few more feet and she burst to life!



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