To pre pressurise the lubrication system on an engine that has been standing for some time or has been rebuilt I use an oil pump that is like a bicycle tyre pump but only about half the length and made of brass.
On engines with a bypass filter (virtually all WW2 era vehicle engines had bypass filters) I disconnect the oil line that goes to the filter and attach it to the pump. I then fill the pump with oil, install the piston and rod and force the oil into the engine. You may have to do it a couple of times before you get pressure up but it will not fail. The extra oil in the engine is not enough to worry about.
Using this method also gives you an indication of engine wear based on how long it takes the pump to stroke out.
David
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Hell no! I'm not that old!
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