So I have a 2007 f650 ford service truck with a c7 cat with 22000 hrs on it. Motor is wore out and has been over heated a couple of times. It has wax63710 motor in it. I have found a unused military surplus motor for it fmm12803. It is set up for 24volt. Was wondering if the ecm will work with 12 volt and if all sensors and injectors will work with 12 volts system or if would have to change out sensors and ecm and injectors with old motor
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F650 ford service truck
- Thread starter Frere
- Start date
Mike L
Senior Member
I’m not positive but I don’t think any of it will work. If you put 12 volts to a 24 volt system I think it would throw some kind of low voltage to ecm code. Next would be the arrangement number of the cat. I’m no guru but depending on what the FMM engine was built for it could have different pistons and camshaft. I had a similar truck years ago that needed an engine. We found a match from someplace in Florida that parted out old school buses. I gotta believe that would be easier than trying to re wire a 24 volt system.
Coaldust
Senior Member
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I concur with Mike L. That sounds like a project that’s going to be full of surprises and expensive learning experiences. Especially when C7’s are relatively common with good reman support.
Well I got the motor for truck. Only had to swap the wiring harness and sensors and ecm from old motor. Did not have to swap injectors or high pressure pump as it does not matter if 12 volt or 24 volts system the all components work on 12 volts. Only had to change the sensors as the wiring harness was different from the 24 volt system. Motor runs great and has good power as well.