P7100 Governor Springs wrong??? - Dodge Cummins Diesel Forum
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post #1 of 4 (permalink) Old 11-24-2013, 12:23 PM Thread Starter
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P7100 Governor Springs wrong???

I really need to hear from some P7100 injection pump experts.. I am by no means an experts nor will I ever claim to be. A few months back I built a 12V up with all new parts. Did all the upgrades to the P7100 myself 191 delivery valves, mack rack plug, afc mods, 3K gov springs, 18 deg timing. The upgrades were very easy and straight forward, so I thought at the time.. After reassembly the engine could not idle or run without missing. Many many weeks of troubleshooting led me to many many dead ends. I sent the injection pump to a Injection pump specialist and had it bench tested and everything seemed to be ok talking to them. The engine could still not idle or run at any rpm without missing after getting it back. I know what you may be thinking, "Timing". No it was not timing. Then the whole engine was sent to a performance diesel repair shop and they could not make any progress after 3 weeks.. They blamed it on the injection pump so I took the pump back to the same shop and had it bench tested again with the same results. So I bought a brand new Injection pump and the engine ran perfect. Started switching out all the performance mods from the old pump to the new pump and was shocked when I found the wrong governor springs were installed. It had one very large spring and two very small springs. There was no medium sized spring. I don't know how this was missed by not only me but several other expert diesel engine and injection pump specialists.. I am now out big $$$ from such a simple mistake.
My main question is will having the wrong gov springs installed cause the engine to not idle or fire correctly??

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post #2 of 4 (permalink) Old 11-24-2013, 07:37 PM
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Not sure the miss part but if the the springs are to tight it wont idle below 1000 rpm's had to re adjust mine after install there is a proper measurment for the threds that should be showing for the correct setting...And i dont know what it is but im sure some of the experienced guys will chim in...

95 2500 4x4 auto no plate 4k springs 180 p pump, 191 dv's 90 horse injectors, Borg warner T6 turbo...Over the 500hp mark!!!!
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post #3 of 4 (permalink) Old 11-25-2013, 08:19 PM Thread Starter
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Thx Josh97..
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post #4 of 4 (permalink) Old 11-25-2013, 09:14 PM
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Bench testing absolutely had to show that there was a problem with gov. springs. Especially when you missing a spring Why would we even bother sending our pumps to bench test? Looks like you are better troubleshooter then those guys, so go get your money back.
Having your springs misadjusted or imbalanced could definitely mess with your idle and fuel delivery at any given RPM.
I'm not a pro, just using common sense.
Make sure you don't put your delivery valves up side down and set GSK nut at 0.040-0.050

Never do more than one stupid thing at a time
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