Truck problems

[dizasterzrfun69]

Hey guys i got a 93 f-150 with a 300 C.I.D 4.9L straight 6. today i was cruisin down the road and it started ticking a little bit, i wasnt sure if it was the motor or a screw in the tire so i reved it up. When i reved it up the oil pressure on the factory gauge went all the way towards the Low side, when i let it idle it's right where it needs to be. I came home, checked the oil and it needed a little so i did that and tried again. It still loses all pressure when i rev it up according to the factory gauge. Any ideas on what this is? we are assuming its the oil pump, maybe the screen on the oil pump, or i just seen a website that suggested main bearings ? thanks guys


Kevin

[tecat-z]

How many miles on the 300? Oil pumps dont generally wear out. Clearance between bearing shells and journals causes pressure drop. Make sure you don't have a faulty sending unit.

[dizasterzrfun69]

How many miles on the 300? Oil pumps dont generally wear out. Clearance between bearing shells and journals causes pressure drop. Make sure you don't have a faulty sending unit.

right around 205,000. i just realized i had a book for this truck and it talks about an oil pressure switch, i think i'll try and test that out and see if its good. i'd think if it doesnt tick/knock then i'd be ok to drive it

[Erics350x]

sounds like main bearings or the oil pump pick-up is gummed up

[pickleweasel_00]

best thing to do is install an aftermarket gauge (even if it's a cheap one and only temporary) and see what it reads. The factory gauges seem to only be good for reference and aren't always terribly accurate