Thread: Curiosity......
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Old 09-06-2007, 07:30 PM
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Breezmister Breezmister is online now
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Join Date: Jul 2007
Location: South Jersey
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Originally Posted by Bill Kapaun View Post
The oil light is an indicator of low oil PRESSURE!

Obviously you don't understand Anti Drain Back Valves.
That's the rubber valve that covers all the small holes on the filter base.
Its function is to prevent the oil from draining out of the filter when the engine is OFF!
If the filter remains FULL, oil pressure to the engine is basically instantaneous upon start up.
IF the filter is empty, it has to refill before you get pressure to the rest of the engine. Why have that 2-3 seconds of no pressure?
Back in the day when I worked for a scaper, he would send his trucks out to be serviced. I would get to pick the trucks up at the end of the day... So I get his 67 International and start driving back and after a few miles the light comes on, blinking and then on full time so I pulled over to see what was up.Now to make a long story short, the guy that did the service did not tighten the drain plug and all the oil drained out So now maybe I have this bass ackward Low oil ? and no, it didn't have a pressure gage.
In the fifty plus years I've taken all kind of things apart, some I've even put back together and they work, but I've never even though about taking a oil filter apart So I've never seen the little rubber thing that covers the small holes, but there is a PH 7575 sitting on the drain pan at work and it will be the second thing I do Monday
As for understanding about the ADBV, well, if it's anything like the set up on a Solo back pack sprayer.....
Anyway, I do have another question about the little red light. How little oil, say in a V 10 triton ( the engine in a 99 F350 ) will keep the light off and the pressure gage in the normal range, it takes 6 qts. Or, what percentage of oil is circulating at any given moment ?
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