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EFV-8 Club Forum / General Ford Discussion / low oil pressure - new engine

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Discussion Topic: low oil pressure - new engine -- page: 1 2 3

jfarrell

07-16-2012 @ 6:44 PM

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I disconnected the lines and fittings to the oil filter. I ran a wire through both lines. They are both open. The line that goes into the side of the oil filter canister has a brass fitting at one end that goes first into the canister. The steel fitting on the end of the line goes into the brass fitting. The brass fitting has a very small opening on the end that threads into the canister. I put a 1/16" drill bit into the end of the brass fitting and it fits. A larger bit will not fit. Am I correct that the brass fitting is the restrictor? Am I also correct that what I described sounds like there is a restrictor in place that it is probably the correct size? If so, it looks like next is to pull the pan and look at the oil pump? Thanks to everyone. Jim Farrell

supereal

07-16-2012 @ 11:24 AM

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Yes.

jaxV8carz

07-16-2012 @ 10:54 AM

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Does the restrictor orifice at the oil filter canister inlet have any effect on oil pressure?

deuce_roadster

07-16-2012 @ 9:17 AM

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By taking the oil filter out of the equation with a pipe plug you may have an "Ahh HA" moment and have the problem figured out. I hope it is as simple as no restriction at the filter.

supereal

07-16-2012 @ 7:38 AM

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This discussion regarding filters has opened another thought on why a newly rebuilt engine has low oil pressure. It is possible that the filter restrictor was left out, or the orifice is too large. We solder the fitting shut and drill a 1/16" hole in the plug. Anything larger will cause low pressure by bypassing oil flow. Most of us were assuming that the engine had decent pressure before the work. I'd look at the restrictor before taking the engine apart. The main virtue of the bypass type filter is allowing an extra quart of oil to the correct four quart fill. The filtering action is low, at best.

keith oh

07-15-2012 @ 6:44 PM

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Whether restrictor is on the in or outside flow through the bypass filter, oil pressure will not read accurately if not restricted. Pressure will show faster if it is on the in side of the filter.

jfarrell

07-15-2012 @ 6:37 PM

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I'm using 20-50 Castroil. The oil filter is hooked up using stock lines. I've put a wire through the lines to make sure they are not plugged, and they aren't. How do I tell if the car has a oil filter restrictor? Thanks. Jim Farrell

supereal

07-15-2012 @ 2:15 PM

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It doesn't matter whether the oil filter restrictor is in the input or output side of the filter. We usually put them on the output so the full flow reaches the filter element first. The restrictor is necessary to prevent starving of the oil flow by bypassing the regular channels.

Old Henry

07-15-2012 @ 8:57 AM

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ford38v8, I'll side with you that 20 lbs. pressure is certainly enought to lubricate the engine. It's not pressure that lubricates but flow. If you have any pressure at all you have flow and that's all that counts. I ran many years with that pressure or lower. Even now with new rebuild and new pump I'm still not much above 20 lbs. after warming up. I personally think that low oil pressure is one of those "phantom deamons" that plague flathead engines like oil leaks that are really not much more than that - phantom deamons.

Old Henry
(The older I get, the better old looks.)

keith oh

07-15-2012 @ 7:57 AM

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If you have a bypass oil filter make sure the restrictor fitting has been installed on the "in" side of the filter.

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