Oil priming a c oil pump

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   Just about to start a freshly rebuilt 1944 C engine. 
My thought is to use an oil extraction pump to push oil into pump and engine.  I could use the pump for my boat motor if it doesn’t work.
Is primming these pumps needed considering the pump does not sit in the oil pan. 
I resurfaced pump to .0025” 

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3rd generation Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 09 Oct 2025 Location: Iowa Points: 27	Post Options Post Reply Quote 3rd generation Report Post Thanks(0) Quote Reply Topic: Oil priming a c oil pump Posted: 12 hours 60 minutes ago at 1:15pm
	Just about to start a freshly rebuilt 1944 C engine. My thought is to use an oil extraction pump to push oil into pump and engine. I could use the pump for my boat motor if it doesn’t work. Is primming these pumps needed considering the pump does not sit in the oil pan. I resurfaced pump to .0025”

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steve(ill) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: illinois Points: 89695	Post Options Post Reply Quote steve(ill) Report Post Thanks(0) Quote Reply Posted: 8 hours 40 minutes ago at 5:35pm
	it may prime on its own... but you can take the 1/4 inch tube off going to the filter and use a squirt gun to fill the tube and pump prior to cranking.. remember, this is a BYPASS System... you dont have to FILL the filter.. The pump pushes 85% of the oil thru the cam shaft to feed all the engine bearings... 15% of the oil goes to the filter to clean and dump back to sump.. Edited by steve(ill) - 8 hours 37 minutes ago at 5:38pm
	Like them all, but love the "B"s.

HudCo Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 29 Jan 2013 Location: Plymouth Utah Points: 4032	Post Options Post Reply Quote HudCo Report Post Thanks(0) Quote Reply Posted: 7 hours 44 minutes ago at 6:31pm
	i use a weed sprayer to pre lube all my new engines i just hook into the oil preasure gauge port mostly

Les Kerf Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 08 May 2020 Location: Idaho Points: 1537	Post Options Post Reply Quote Les Kerf Report Post Thanks(0) Quote Reply Posted: 7 hours 20 minutes ago at 6:55pm
	DickL has posted his method which is to remove the oil filter and slip a snug fitting hose over the metal tube that Steve described above. He then uses a small funnel to fill the hose and lets it gravity feed down, maybe repeating this a couple of times. Then, leaving the valve cover off, allow the hose to hang into the valve area in order to verify that oil is actually flowing upon initial startup. This method also provides for observing the flow of oil to the rocker arms. I only recently learned of this method, but I intend to do this on my next fresh startup.