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post #1 of (permalink) Old 08-12-2004, 10:47 PM
Brushrunner
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Low Oil Pressure ??

I have an '84 F150 with a 300 cu. in.,6 cylinder.My problem is I first start it it has good Oil Pressure.Let it warm up it drops off way Low.Still runs smooth,just Low pressure.

Been running like this for short periods for two years.Would it be weak Oil Pump ?

Brushrunner
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post #2 of (permalink) Old 08-13-2004, 09:25 AM
 
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Re: Low Oil Pressure ??

Sounds like aging rings, bearings and pump. Things are tight when it is a cold block but when it warms up it gets a bit loose. Try using 20W50 and keep it changed. Do not flush the engine you could make it worse...
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post #3 of (permalink) Old 08-15-2004, 05:25 PM
 
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Re: Low Oil Pressure ??

Are you going by the factory guage or a mechanical gauge? If the factory guage is showing low I would spend $10 on a cheap aftermarket mechanical guage to see how low it actualy is. I've had several old trucks that ran really low pressure at idle ie 4/10 psi but ran about 20psi at highway speeds. Might be a good idea to just drop the oil pan and put a new pump in. Not very hard to do. Alot of times the problem is crud in the pickup screen not the actual pump itself. However if you have it apart its worth investing in a new pump. I highly recomend the fel-pro ulta-seal oil pan set for a 300. It comes with these neat plastic pegs you screw into the block that hold the gasket in position till you mount the pan. I saved mine and have used them on several other projects. New pump and pan gasket probably would only run $30 or so maybe less.
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