Description
In this video I have an Rv that was brought to me with the complaint of hard starting particularly when hot and low power, After doing some diagnosis work I determined the P7100 injection pump had issues. So I pulled it off and sent it to the experts at Area Diesel. They found as I had suspected it had plunger and barrel damage which was resulting in fuel bypassing and not creating the proper pressure to fire the injectors especially when hot as the clearance increases with temperature. I got the pump back and installed it. I had requested it to be set 25% over stock fuel. The power was good but it still had issues starting. If I worked the throttle linkage once it would set the governor at starting fuel and it would fire right up. If I did not then it would often stay at idle fuel and not hit hard enough to start quick. I could have pulled the pump back off and returned it to area diesel for adjustment but I didn't want to spend another 8 hours doing that plus shipping so I decided to adjust the governor myself. So I backed the governor retainers off a few clicks to make it more sensitive on the idle spring and that seemed to cure it. Had the RV had a throttle cable instead of an air actuator you could have just touched the throttle once and it would have fired up as is. But because this RV has an air controlled throttle that meant there is no throttle control until it has been running and has air pressure. This was unacceptable for how I wanted it to behave so adjusting the governor and resetting the idle screw to make it idle correctly got this thing starting like it should. A test drive revealed the power was good as it would hold 70MPh up a 6% grade no problem and not heat up. Before the repairs it was lucky to top that 6% mile long hill at 35mph from 70mph. So if you have a RQV-K governor (Dodge 2nd gen style) on a p pump and have starting issues you might look at making an idle spring adjustment if you are confident in doing the work. Just be sure to always maintain AT LEAST one full firm click on the retainers. Pump governor weights coming loose while running is catastrophic. If you aren't confident in working on it send your pump to Area diesel and they can adjust it for you. That being said it is a trick adjustment to be made on a test stand because the pump speed is input by the stands electric motor which comes up to almost instant speed. It is much different from how the pump actually spins up on a cranking motor where pump speed is directly effected by its self and how it is making the engine fire.