['I believe we concluded here in the past that the function of this ball is there to keep the return side of the pump primed..]
That may be one function of the oil pump base plate ball...however....
From factory worksheet No.604 'Oil pressure valves'....Quote....'There are two ball valves in the system, and both are placed between the tank and the sump to prevent the transfer of oil when the engine is not running'...Ian
Hi Ian, Think that quote exactly covers it....:relaxed: . prevent transfer of oil while not running... I would say from the return line as this valve is in the return.
My view is that if the ball is not there or not sealing properly, the return line can drain when not running and the gears will be pumping air until the oil level in the crankcase reaches the gears. So think it is mainly there to get the return flow start as soon as possible to keep the crankcase dry.
Kev there is a ball and spring behind the small hex plug at the bottom of the timing cover. It's the first, easiest and cheapest thing to check and or replace if you experience wet sumping. Ron
thanks Ron, there was nothing in there when i removed it......
regarding my NOS oil pump. turns nice and free by hand, and still when 2 bolts are tightened in the mounting holes but..
when i install it and start to just nip up the bolts it gets tight in one area, for 270 degrees its free but the last 90 it gets tight
so i removed it and installed the 2 bolts again and tightened them up and its free through 360 degrees
but same again on installation, i dont want to lap the gears as its so free turning out of the motor and even through the 270 deg
any ideas
thats with or without the gasket
drive shaft is nice and free