Ken Macfarlane
Well-known Member
So my Delphi / Lucas rotary pump (modern dp210 but related to CAV) was exhibiting signs of a sticking metering valve after getting water in fuel.
I let it sit over the winter with a heavy dose of ATF in the fuel and run into the pump and today used the torque trimmer port to push on the metering valve arm to confirm the metering valve moves freely.
But still having trouble governing speed, its like a delay on the governor. I set the throttle, 2-3 seconds later it will respond and overshoot rpm like a sticking metering valve. Small changes in load like using the hydraulics knock the rpms way back before the governor can recover.
If I lower the rpm's too fast it shuts the fuel off completely and I have to crank quite a while to get running.
I'm not sure if something is going on in the latch circuit or something? Its a modern pump without timing key and no pump doctor nearby so I don't really want to pull it.
I let it sit over the winter with a heavy dose of ATF in the fuel and run into the pump and today used the torque trimmer port to push on the metering valve arm to confirm the metering valve moves freely.
But still having trouble governing speed, its like a delay on the governor. I set the throttle, 2-3 seconds later it will respond and overshoot rpm like a sticking metering valve. Small changes in load like using the hydraulics knock the rpms way back before the governor can recover.
If I lower the rpm's too fast it shuts the fuel off completely and I have to crank quite a while to get running.
I'm not sure if something is going on in the latch circuit or something? Its a modern pump without timing key and no pump doctor nearby so I don't really want to pull it.