Removing Oil Pressure Relief Valve
The oil pressure relieve valve also has to be removed - this way it will be easier to clean that case half (and inspect the plunger).
The valve is under a large cap with a flat slot underneath the oil cooler mount. I was able to easily unscrew this by tapping sideways at one edge of the slot with a chisel and hammer.

Behind the plug is the spring.

And after pulling the spring out, I was able to stick my pinkie in the hole and pull out the plunger.

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