Exhaust temperature, bad injectors, and an old Cummins

stranger · Mar 27, 2011

Here is what some old knowledgable hands have to say:

Your shop manual is not old enough for your engine. Like been said set the injectors and valves at the same time on 1 or 6 which ever is ready. Which ever is ready is when the vales on 1 or 6 are loose on the cyl. Always set injector before the valves.But on same cyl.
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stranger · Mar 27, 2011

Here is for an NH 220;

Adjust crosshead on four valve heads first by holding crosshead, screw in adjusting screw until you feel it touch valve, turn an additional 1/8 turn and lock screw.
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The valve set marks are on the Accessory drive pulley and line up with a pointer cast into the front cover at about the 2 o'clock position, the firing order is 1-5-3-6-2-4.

The set marks are A or 1-6VS, B or 2-5VS, and C or 3-4VS. There is also a 1-6TC mark.

Injector is always set first the valves. You can start anywhere in the sequence and required two revolutions of the engine to complete all adjustments.

Turn accessory drive pulley until one of the marks lines up with the pointer, say A or 1-6VS, check to see which set of rocker levers are loose (1 or 6) this is the cylinder to be adjusted.

You will need to use a calibrated dial type tension wrench (ie Snap-on) and adjust the injector to 72 inch-lb, once set lock with locknut.

Adjust valves on the same cylinder to 0.014" for the inlet and 0.027" for the exhaust.

Turn engine to next VS mark and adjust the next cylinder following the firing order (ie 2 or 5)

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Read more: Heavy Equipment Questions - NEED INFO ON INSTALLING INJECTORS AND SETTING THE OVERHEAD - JustAnswer http://www.justanswer.com/heavy-equ...injectors-setting-overhead.html#ixzz1HlwmORbW[/COLOR]

albertaphil · Mar 28, 2011

Sorry for being so dense. I get it now. With my injectors, I need to set them WHEN THEY ARE INJECTING, not when they are slack (like the valves). So I need to bottom them in the cups.

Hmmm, that would explain the resistance... I hope I didn't just bugger an injector or two.

stranger · Mar 28, 2011

If the injector is set when both valves are closed, it will not bottom out. You are setting the height of the injector tip from the bottom of the cup based upon the tension of the injector spring. The perfect way is with dial guages, but this method has been used forever. I hope you didn't bust a tip off of any injectors or bend a push rod.

albertaphil · Mar 28, 2011

You think I could possible knock the tip off the injector down into the cylinder? That would be very bad news...

albertaphil · Mar 29, 2011

Removed the injectors that got squeezed, and there aren't any broken tips or bent links or bent pushrods, so I guess I'll put it back together (adjusted the right way, this time) and see what happens.

BTW, the old injectors appear to be adjusted properly, which means that the new injectors I put in have always been retarded slightly.

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