Need a sanity check before I fiddle with my HiPressure mechanical fuel pump. The pump is an area I have zero knowledge about. Its running fine, just rebuilt and no leaks. After reinstalling the pump after my rebuild and reattaching the linkage-it idles at 850 RPMs (no load). I assume its safe to adjust the linkage adjusting screw to reduce the RPM to between 400-600? This is the linkage that connects the throttle arm on the pump to the throttle on my pedestal. This came up because I was calibrating my new tachometer with a laser measurement tool that revealed the engine is idling at 847 RPMS- the tach is way off and needs to be adjusted, buty I want to get the idle down to a resonable number too.
You can set the stop on top of the injection pump to whatever works for you. It is the only user adjustment available to you. If something has lockwire and a lead seal on it, don't touch it. I like it where it starts easy and idles as low as the engine is comfortable with while running in gear. You will be able to tell a happy engine speed.
You know about the tach adjustment screws on the back of the tach? That can take a bit of fiddling as well, checking at both idle and cruise as you adjust.
Thanks Sv/Journey-its what I figured, but hi pressure pumps are a bit of a mystery to me so thought I'd ask first. I do know about the tach adjustment screw-its what got me to measure the crankwheel rpms in the first place.