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JD 310 Missing when warm. New Inj pump and injectors

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Dick Olsen

06-18-2001 08:32:50




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Back here again�.. Had the injector pump totally rebuilt by H&H as well as new injectors. ($750.00) Still missing when warmed up. Only take 10-15 minutes to start missing. Some black smoke and feels like a dead miss. I have replaced the fuel filter and have new fuel line to the fuel pump. Also replaced the return lines around the injectors. I have not drained the tank again and replaced the fuel. What should I look at next? One thing I noticed is that it seems hard to hand pump the fuel through the fuel filter (that is why I replaced it). (Fuel pump is only 1 year old) Still seemed hard to pump the filter up after the new one was on. The hand pump on the fuel pump almost stopped pumping from the pressure. Is there something like a check valve in the fuel filter housing?

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jonathan

06-18-2001 14:41:30




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 Re: JD 310 Missing when warm. New Inj pump and injectors in reply to Dick Olsen, 06-18-2001 08:32:50  
...thats the tough part about trying to diagnose over the internet .... valve adjustments been checked ?? .014 intake---.018 exhaust ....can check for really excessive play in the timing gear train....turn engine back and forth and see how much it moves before timing mark on injection pump moves...thats more of an opinion type measurement..no real spec. that I know of...



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Dick Olsen

06-18-2001 18:07:17




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 Re: Re: JD 310 Missing when warm. New Inj pump and injectors in reply to jonathan, 06-18-2001 14:41:30  
Also when I removed the injector pump I had to rotate the engine with the timimg window open. There seemed to be no slop in the timing gears.



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Dick Olsen

06-18-2001 18:05:32




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 Re: Re: JD 310 Missing when warm. New Inj pump and injectors in reply to jonathan, 06-18-2001 14:41:30  
I haven't done that yet. It started doing this about 3 months ago. One day after 3 hours of use it started missing. It sat overnight and ran fine the next day for an hour, then started missing. Since then it has started missing sooner and sooner. Why would the valve setting change unless the cam is going flat or the oil pressure is dropping? (it is not)



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twopop

06-18-2001 18:39:27




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 Re: Re: Re: JD 310 Missing when warm. New Inj pump and injectors in reply to Dick Olsen, 06-18-2001 18:05:32  
the valve setting could change if a valve got hot and became weak and tuliped the valve surface,and as the engine warms up the valve clearance is reduced and keeps the valve open.it is important for you to find out which cylinder is missing.



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Dick Olsen

06-18-2001 21:31:12




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 Re: Re: Re: Re: JD 310 Missing when warm. New Inj pump and injectors in reply to twopop, 06-18-2001 18:39:27  
Just got done cleaning our the filter holder. Nothing in there to cause the problem. any suggestion on how to isolate the problem cylinder. I started it up tonite. Missed a little at first then cleaned up. As soon as the temp gauge started to read (4-5 minutes) it started to miss. It puffs blue smoke when it misses. The oil seems fine (no diesel).

Is there anything else I should do to rule out the fuel and fuel delivery system?

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twopop

06-19-2001 05:57:32




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 Re: Re: Re: Re: Re: JD 310 Missing when warm. New Inj pump and injectors in reply to Dick Olsen, 06-18-2001 21:31:12  
start i up like you did last nightand wait for it to start missing.then crack open the injector lines one at a time.the engine should react if the cylinder you are checking is not the one missing.also the blue smoke will probably go away when you open the line to the missing cylinder.another way may be to start it up and check the temp of the exhaust manifold at each cylinder,close to the head the cooler one would be the one missing

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