Posted by oldtanker on December 19, 2011 at 22:31:01 from (66.228.255.223):
In Reply to: priming an oil pump? posted by Tony in Mass. on December 19, 2011 at 17:41:22:
If an oil pump looses prime one of 3 things are going on. Cheap or bad filter, line not sealed or the pump is about shot.
Assembly lube is used to lube bearings until oil pressure comes up on a rebuild. Some type of grease on the pump gears helps the pump prime on startup after a rebuild. But filters have a built in back flow valve so the pump will not loose prime. Case of you get what you pay for. Cheap filters have a history of bad features like the back flow valve and by pass valves. Yes once a filter is plugged the system bypasses the filter.....about 8-10 hours for a good filter and as little as an hour with a cheap one. If the filter plugs in say 1 hour and there is no bypass then you run the bearings out of oil and destroy the engine.
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