hv oil pump?
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Joined: Jan 2004
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hv oil pump?
i have a 78 f-150, 400 auto 4x4. i have a big oil leak that i think is the rear main. have checked sending unit, rear of the valve covers, all looks well. i had my exhaust split so i could remove the pan some time back. now its time to get started. my question to you men is when i am in there should i install a hv oil pump? the truck has at least 100000 miles on it? it burns some oil but still runs really well. i have done some mods, dual exhaust, holley intake, edelbrock 1405 (highly recommend), k&n. i am using 20w50 as my pressure runs on o of normal gauge when warm. would like to drive this truck a few more years before rebuilding motor. will hv oil pump extend life or spin a bearing? will go down to thinner oil if hv pump is used. thank guys for all your help.....
Posting Legend
Joined: Sep 2001
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If you have no oil pressure when warm it is time to rebuild. The HV pump will not make much difference since they only provide ~20% more flow than a stock pump. Of course your present oil pump is worn out also so there will be a greater improvement in oil volume. Unfortunately I can say from experience it won't be enough to significantly affect your oil pressure. On my 400 the pressure to the lifters got low enough to cause the valves to rattle. Oil viscosity will not help at this point either. -Rebuild time.
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Originally Posted by Torque1st
-Rebuild time.
Ernie
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That is exactly what he said. Experience with the factory guage has taught me that at a reading of "O" in normal, the oil pressure may be 5 psi or it may be 25 psi. They are that unreliable. Additionally, he indicated that the engine has over 100k on it, and burns some oil. The rear main has a "bad" leak according to the description. So as an alternate, he could put on a mechanical guage to determine the exact pressure and make a decision based on that, or he could use the aggregate of the above info to decide to rebuild. I know we are not discussing my engine, but if we were, there would be no question in my mind as to what to do. So the short answer to his question is no, a hv oil pump will not solve the problems he's experiencing. Having to constantly monitor the oil level, dripping oil all over the clutch, and taking a chance on running the cam or crank dry is the trade off for not rebuilding in this situation. Just my $.02.
Ernie
Ernie
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thanks men for your advice. by the way, it was the o on the word normal. sorry for the misunderstanding.
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More Turbo
Joined: Nov 2003
Posts: 682
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From: Peoria, IL (more or less)
Green,
None taken.
Now, let's have some fun by spending his hard-earned money on a virtual rebuild. It's much easier than spending our own. How's about a set of CHI aluminum heads?? Kind of like the TV show "Green Acres": "Mr. Douglas, have I got a deal fer yew!! A pair of genuine, artificial, fur-lined, chrome-plated, cylinder heads!"
I need a nap.
None taken.
Now, let's have some fun by spending his hard-earned money on a virtual rebuild. It's much easier than spending our own. How's about a set of CHI aluminum heads?? Kind of like the TV show "Green Acres": "Mr. Douglas, have I got a deal fer yew!! A pair of genuine, artificial, fur-lined, chrome-plated, cylinder heads!"
I need a nap.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
I'd hook up a mechanical gauge to see where you're really at. I've been in your spot. I was hoping a high volume pump would get my oil light off...turns out I was barely pushing 28 pounds at high throttle. Your bottom end could be so loose that the bearings just bleed off oil, and pumping more won't do much (HV pumps are only good for 20-25%). And if you're over 100K on a 400, then if you're not already at that point, you probably will be soon. The cool thing is though, these motors have been known to run forever that way. Mine still does.
Posting Guru
Joined: Mar 2005
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From: western montana
I am in a similar spot and am rebuilding but got an extra motor to start now. That way if it does go I'll be a bit more prepared- I have a rear main leak as well- I HATE oil leaks as does my wife- who hates them a great deal more than me.
Senior User
Joined: Aug 2004
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I've been runing my 400 for about 25 000 miles with bad oil pressure, bad timing, bad compression and a little heating problem. My 400 engine as 87 000miles on it and still run pretty good, but it suck too much gas.
I can't wait to have it rebuilt. I have a lot of faith for these engines.
Let us know about what you are planing to do with yours.
Good luck
I can't wait to have it rebuilt. I have a lot of faith for these engines.
Let us know about what you are planing to do with yours.
Good luck