Turn up an older Cummins? - TheDieselGarage.com
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post #1 of 39 (permalink) Old 03-25-2007, 01:19 AM Thread Starter
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Turn up an older Cummins?

I think its a 400 Cummins but not sure exactly. Its in a Tri Axle International Dump truck about mid 80's. What can be done to it to help with power? It makes hardly any smoke at all now. Thanks!
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post #2 of 39 (permalink) Old 03-25-2007, 01:26 AM
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More power is rather simple on those older engines.

If you want smoke, that's something else entirely.

Lack of smoke does NOT mean lack of power, in fact, it means you are getting power from ALL the fuel you are using, instead of blowing 1/2 of the fuel out the stack as soot

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post #3 of 39 (permalink) Old 03-25-2007, 01:28 AM
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Don't exactly recommend doing this,but, if it has a PT pump, just put a pair of vice grips on the fuel return line. Just don't pinch it off completely. It raises the fuel pressure, and gives more power.

JohnG is right, though.

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post #4 of 39 (permalink) Old 03-25-2007, 03:30 AM
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What is your gov setting. Sometimes lack of power is just the engine not winding high enough.

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post #5 of 39 (permalink) Old 03-28-2007, 12:37 AM Thread Starter
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Thanks guys. I will check a few things & get back to ya.
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post #6 of 39 (permalink) Old 03-28-2007, 01:38 AM
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There are "Buttons" in the pump you can change to get more fuel to it. I heard that setting the injectors loose will give it a little more fuel too.

Edit: Finding buttons can be a little hard. Probly due to emission reasons.
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post #7 of 39 (permalink) Old 03-29-2007, 12:07 AM
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The pump uses a spring and washers to change the governor setting. There is a screw in the middle of the governor spring that I think raises the pump pressure. The more washers the faster the governor setting, there are also different springs rates to course adjust the setting.

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post #8 of 39 (permalink) Old 03-29-2007, 12:28 AM
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Quote:
Originally Posted by curtmu
There is a screw in the middle of the governor spring that I think raises the pump pressure.

The screw in the govenor plunger adjusts the idle speed only.
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post #9 of 39 (permalink) Old 03-29-2007, 12:33 AM
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put a different button in your fuel pump,then your truck will haul ***** :smoke
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post #10 of 39 (permalink) Old 03-29-2007, 12:37 AM
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Quote:
Originally Posted by kevin
put a different button in your fuel pump,then your truck will haul ***** :smoke
Ya dats what I said:Thumbup: But you can't just buy a button anymore. At least not here in SoCal, Better off finding a pump to steal the button out of.
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