Oil pressure
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Junior User
Joined: Jul 2005
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From: Eglin AFB
Oil pressure
Here is the deal guys, Last week when i pulled into my drive, my oil pressure guage dropped to nill. I replaced the sender and nothing, put a mech guage on there and got 25-30 at idle and would drop to 10 when i hit the gas. Whats up with this. i am planning on replacing the oil pump and all components this weekend, i just want to get some more info on what i need to do in there other than inspect the bearings and rod.
A little info on the truck 1994 ford bronco with a 302, 186000 miles no blow by, no knock, had a lifter tick after this happened, truck hasnt been moved since this started. No noise coming from anywhere below side or top of motor. no knocks or anything like that. do you think it was just oil pump on its last leg and i caught it in time or what? also no loss of power, and everything other than lifter tick and oil pressure is good to go.
thanks
ken
A little info on the truck 1994 ford bronco with a 302, 186000 miles no blow by, no knock, had a lifter tick after this happened, truck hasnt been moved since this started. No noise coming from anywhere below side or top of motor. no knocks or anything like that. do you think it was just oil pump on its last leg and i caught it in time or what? also no loss of power, and everything other than lifter tick and oil pressure is good to go.
thanks
ken
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Actually, if oil pressure falls too low at idle, that is indicative of worn bearings. In that case, oil pressure will pick up as RPM increases. But, in your case, it seems that oil pressure actually falls as RPM picks up. The only explanation I have heard for this is debris in the oil pan. At idle, the pump is not spinning very fast and the debris is allowed to settle. However as RPM picks up and the pump spins faster, the debris is drawn toward the pickup screen and stays there, blocking the volume of incoming oil. I hope someone else can add more to this story.
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From: Eglin AFB
Originally Posted by stevef100s
It may be the pump. I've most often seen oil pressure go down with more rpm, when one or more rod bearings are worn. Centrifugal force slings oil out. Who knows?...
Hey steve i noticed you are in the same area i am, destin/ft walton...i live on Eglin AFB. shoot me a PM so we can chat more thanks
Actually, if oil pressure falls too low at idle, that is indicative of worn bearings. In that case, oil pressure will pick up as RPM increases. But, in your case, it seems that oil pressure actually falls as RPM picks up. The only explanation I have heard for this is debris in the oil pan. At idle, the pump is not spinning very fast and the debris is allowed to settle. However as RPM picks up and the pump spins faster, the debris is drawn toward the pickup screen and stays there, blocking the volume of incoming oil. I hope someone else can add more to this story.
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From: Eglin AFB
Originally Posted by Kemicalburns
stick with a standerd pump to. dont let the parts house talk you into any other type. i take it your pulling you motor out to do this?
ken
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remove the upper intake so you have more room to move the engine up. it still gonna be a tight spot to work from
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From: Eglin AFB
I was thinking about putting my lift on at the same time that way i can just drop the TTB out of the way but i can not find anywhere local that has a drop pitman arm under 120 bucks
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From: Eglin AFB
if the worst thing happens, i need a new engine, i have found a 302 wiht only 67000 miles on it out of a 94 250 pretty good deal 500 shipped. it will be complete so i can swap them out after i change all the gaskets, and stuff like that. wish me luck
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From: Eglin AFB
fixed
Thanks for the help guys, i installed a new pump, pick up tube screen and drive rod, and it is good to go now. 65-70 psi at start up 50 at idle and 40 at crusing speeds. thanks agian
ken
ken