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Old 05-01-2013, 06:33 PM
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Oil psi

FORD 351W, Just got this motor, all in peaces,,does the mecanical oil psi come out of the block between the fuel pump and the oil filter. was running 20w50 and there was lots, well 40psi, all the time, but took 30 sec to get there, so i switched to 10w40, now oil psi drops to about 5 psi when warming up,,,,any thoughts???? thanks in advance.....i'm going to let it cool down, restart it and see what happens.....

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Old 05-01-2013, 06:41 PM
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All in pieces but but you're going to start it when it cools down? I'm confused. As for the low oil pressure, check the bearings.
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Old 05-01-2013, 09:38 PM
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yes i bought the motor in pieces, and put it together with new bearings, pistons, etc,,,,,i need to know if i have the oil psi sender in the right place,,,,,,between the fuel pump and the oil filter?????
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Old 05-01-2013, 10:34 PM
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You're on the right track. That's where the oil pressure sending unit is located.
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Old 05-02-2013, 12:12 AM
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Did you prime the oiling system before starting? Try a mechanical gage even if just for the test. What was your rod and main bearing clearence?
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Old 05-02-2013, 12:26 PM
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I can't remember the clearances, but they were in spec,,,and there was 40psi with the 20w50, for got to say that i just over heated the motor , then switched to the 10w40,,i think your right,,,I cooked the bearings
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Old 05-02-2013, 12:49 PM
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40 psig in a SB Ford engine is too low. You should be seeing about 55 min/65 max with a standard oil pump. You either have a bad gauge, or as you suggested, bearings that have been cooked. That will include cam bearings as well. Of course you could also have excessive clearances (cam, rod, main bearings), a weak oil pump spring or excessive pump gear clearances or even a clogged galley or even a missing pipe plug. That oil pump, as cheap as they are, should be replaced at every overhaul, or like I do, usually every time the pan comes off. Then the oil pump drive shaft should also be replaced with a new or after market heavy duty version (ARP 154-7901 for a 351W are very good as are the Ford Racing M-6605-A341)
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Old 05-02-2013, 01:09 PM
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THE oil pump is a new after market high volume pump, and i do have the arp pump drive,,,i was thinking that the mecanical oil gauge has that plastic line"hose" engine to gauge,,what if that has air in it,,,air will compress, and give a wrong reading on the gauge...the line is 10 feet long...i think i'll shortin the line to 2 feet and put a differant gauge on it...
i'll try that and get back to you ,,,,thanks for the thought
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Old 05-02-2013, 01:46 PM
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Quote:
Originally Posted by stewd8 View Post
THE oil pump is a new after market high volume pump, and i do have the arp pump drive,,,i was thinking that the mecanical oil gauge has that plastic line"hose" engine to gauge,,what if that has air in it,,,air will compress, and give a wrong reading on the gauge...the line is 10 feet long...i think i'll shortin the line to 2 feet and put a differant gauge on it...
i'll try that and get back to you ,,,,thanks for the thought
One thing with the SB Ford 'W' design is that you really do not need that high volume oil pump -

Usually those mechanical gauges will all have entrapped air but if a good brand name will still read fairly close to correct but will fluctuate. I'm sold on the electrical gauges as being the most consistent plus all manufacturer's to the best of my knowledge use them now if for no better reason then the fact they are pretty failure proof (and since I've had my hot oil foot bath .... )
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Old 05-02-2013, 02:06 PM
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i just took off the oil psi line from the engine, and put a 1 foot line on, with a s/w gauge, started the motor, and gauge went straight to 43psi.in 1 second...low but good
i then removed the 1 foot and s/w gauge and replaced the autolite gauge and the 10 foot line,,restart and got 3 to 5 psi....so,, i did not cook the engine,,,thank god,,,,
now i'will remove the dash, and the gauge cluster and replace the autolite gauge with the s/w gauge, and prime the line full of oil ,,,see if that works
the reason for the high volume oil pump is that i know the motor is quite loose,,extra oil to fill the gaps....
i'll be back
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