Dozer: How does a diesel run when the injection pump goes bad?

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Frequently Asked Question:

How does a diesel run when the injection pump goes bad?

I have an old international dozer that starts up on gas to warm the engine then it switches to run on diesel. It runs great on gas which tells me compression is good. The problem is it smokes badly the turbo is off of it so that was not the problem. It seems to be bad on all cylinders could it be the injection pump? Im thinking that because it seems to smoke on all cylinders some maybe more then others. Or possibly could valves all be out of adjustment? Any ideas?

Answer by boogie_4wheel
If the turbo is not installed (bypassed) it will blow a lot of smoke under a load. The injector pump is ‘tuned’ to be fueling with a turbo installed (so more air is being forced into the cylinders). Without the turbo in place, or without any boost, your just over fueling the motor, causing a bunch of black smoke. Either install the turbo (or another turbo) or just back off the throttle some. Excessive soot will also require oil changes more often because it contaminates the crankcase oil.

Usually during an injector pump failure (or pre-mature failure) you just have fueling issues, air can be injected with the fuel, lack of fuel, or sometimes excessive fuel (rare). The exhaust color usually turns white (like if it was cold), and you have irratic acceleration, engine surging, and rough/bucking operation.

I doubt that it would be the valves.

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2 Responses to Dozer: How does a diesel run when the injection pump goes bad?

  1. guess78624 says:

    Smoking on this tractor is not uncommon, till it gets heated up “tototal internal temperatures”, (which is condsiderably more than gas operation)! We had a 400 IHC tractor that started gas-to-diesel, and it smoked for better than a minute sometimes!

    Normally injection pumps work,- or don’t work (or might miss on some cylinders)! Gernerally not much in between, – unless the “rack” on injection feed part is bad, or stuck, it may be injecting too much fuel all the time! It’s been almost 40 years since I have had one apart, and I don’t remember if they have a diaphram opearting the “rack” that controls amount fo fuel injected or not! — ( I know Mercedes does, as I restored them for 20- years)!!

    I think the first thing I would try is to put a couple pints (or quarts) of Marvel mystery oil in tank, and remove cap on injector pump (where you can look down inside and see fuel), – fill it up with Marvel Mystery and let sit for a couple days, — if rack is just stuck from sludge or something, this will cause it to loosen up and help fully release, — it will also clean up injectors, pump, and tank ! This is not an expensive thing to try anyway, and won’t hurt anything!

    The good news here is that the expensive part of injection pump appears to be ok yet, — if pump cannot push fuel through good injectors, –It will be expensive and require total rebuild, which is not cheap!

    Now this brings us to last observation! Have you had this tractor for a long time, and this is something new, — or did you buy it recently, and so have never seen it run “normal on diesel”?? It is possible that it has been run so long with worn out injector tips, that it no longer can cause fuel to “atomize” and more resembles putting it in with a garden hose than “spraying a nice pattern”– fuel “gobbed in” will not burn totally, and so will put out a lot of smoke! You could try pulling a couple out, and having checked (and tips “resized” if nescessary), and then see if engine “blows” less smoke., It is cheaper and easier than removing injection pump and taking it in and having checked! Have you tried running it with air cleaner top off so it doesn’t filter air?

  2. Fred S says:

    I know when my injector pump went bad on my 7.3 diesel it just died on the road I also know that the diesel run at a lot higher compression so in theory you could run great on gas and poorly on the diesel fuel I would run a compression check on it and go from there.

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