So I am trying to figure out if an OEM (and used) oil pump I have is still good. I have done the basic checks and perhaps that is enough, not sure. Here's what I have done (according to attached spec):
- All gears look good
- Internal oil pump gear end float in spec (.08 mm)
- Internal oil pump gear teeth clearance to body of pump in spec (.05mm)
- Pressure relief valve operation smoothness: The relief valve piston has some slight scoring (enough to very barely feel with a finger nail). Is this piston supposed to baby skin smooth? Also, when I slide the (oiled) piston in the (oiled) relief valve cylinder bore it moves smoothly for the first 1/2", then sort of catches before moving smoothly again. Normal or not good? If not good, can I just take fine emery cloth to the cylinder and polish it smooth?
- Pump drive shaft: This is the shaft that connects with the distributor. When I turn it it seems like it has something like a slight "compression" stroke halfway through. That is to say, it does not turn with the same torque all the way round, but instead sort of slightly hiccups like a much smaller version of turning an engine crankshaft with a compression stroke. The entire rotation is smooth, it just has that slight "compression" stroke feel. Is that normal?
- Clearance between main drive gear & body: The clearance between the brass drive gear to top of body is .15mm. On this thread it states clearance should be between .2mm-.5mm. So is .15mm a problem?
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