Ih 715 running rough

Aacord16

Member
Had the 715 diesel hydro out today and it was running great when all of a sudden I developed big miss and then a nock. Changed all 3 fuel filters still there. Started cracking injector lines loose and it appears to me that some injectors are getting a lot more fuel to them than others. How can this be the injection pump only has 1 plunger. I took injectors out and pop tested them all passed. If i lossen number 6 the knock goes away. Engine black smokes at idle to. Ideas? Gonna take injection pump off next. O it's the 310 German diesel.
 
Perhaps a broken rocker arm? I had that happen on my IH 1456 with the 407 disc-chiseling a few years back. Changed filters first, cracked lines second, pulled valve cover third and
found the problem. Let us know what you find.
 

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