Is this what an engine looks like that's ready to start?
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How am I supposed to determine the thrust washer sizes needed when you can't do that until oil pressure is up? I think the instructions say to crank the engine for 30 seconds before using the tool to measure the required thrust washer thicknesses but that assumes the engine has been running recently. What is the procedure for checking thrust washer thickness on a new rebuilt engine that has never been run?
Here is a thought, the compensator takes up the slack in the valve train when the valve is completely shut. At this point there is no load on the system other than that which the internal spring in the compensator exerts on the rocker arm. Assuming that the compensator spring can take out the slack in the system then this is the position it will always be in regardless of whether or not there is oil in the system. So check to see if your compensators/system fall within the line on the measurement tool and select the pucks that achieve this if any don't.
The oil pressure is really only needed to hold the compensator in place when the force is exerted on it by the cam lobe opening the valve.
What do you think if this supposition?