Oil pan/Pump Question
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From: Concord, New Hampshire
Oil pan/Pump Question
Ok, Im gonna start the procces of replacing my leaky oil pan and pan gasket on my 87 f-150 351w soon, But heres my question, im gonna stick with a stock pan, because there cheap, then im gonna get a one peice gasket, but for an oil pump, what would be better, standard, or high volume??? this is where im stuck, im not sure what one to order, and when i do, will they both be able to run the same grade oil, i run 15w-40, in the summer, and 10w-30 in the winter, any input would be great i really wanna order up my parts, thanks.
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Joined: Nov 2003
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From: Ocala, FL
Don't bother with a HV oil pump unless you are going to race and increase your oil pans capacity. Use a high quality iron body stock replacement oil pump. The SBF stock oiling system is very good in stock form. HV oil pumps are not needed in most applications.
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From: Concord, New Hampshire
Ok, well i guess my question is will it hurt it in anyway? it looks like im gonna hold off for awhile, i aded some stp oil treatment and it brought my oil pressure up and the leak is actually not that bad, i steamcleaned the engine bay, and it seems to be comming from the fuel pump, so im gonna get a gasket and try that, but it looks like a bitchy job. but about the oil pump someone told me i may run into problems with the oil not being able to get out of the valve covers fast enough due to sludge build up in the passages, so maby im better off to just go with stock.
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From: Fayetteville, N.C.
Oil pan
If you are concened with the oil not getting out of the valve covers fast enough you need to clean it out and clean out the pcv system while your at it. If STP brought your oil pressure up you might want to think about rolling in a new set of bearings while you have the oil pan off and are replacing the pump. Of course this is based on your opinion about the condition of the rest of the engine.
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From: Concord, New Hampshire
well it only has 104,000 on it, so i dont think im gonna waste my time with bearings, i need to get 2 years out of it, then i plan on pulling the motor, and boring it out as big as i can and doing some other motor work, ill be outa the tech school and working at a dealership blue oval certifyed so ill need a project to keep me busy.
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One problem that I ran into while building my 351W with the HV oil pump was pump to pan clearance. The HV pump is taller, ie sits lower in the pan. I had to get a torch and a ball peen hammer and form the bottom of pan down. It took an hour or 2, but then my engine was on a stand where I could check clearance with putty. Food for thought. '90 351W in a '92 F 150
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From: Mid-Missouri
Bad oil pressure is not always a sign of a bad oil pump.
Usually low oil pressure is a sign of bad bearings (cam and crank), plugged pick-up screen in the pan, or the check valve on the pump has a weak spring.
STP doesn't fix problems, it only masks the symtoms.
HV pump probably won't do you much good. I wouldn't spend the extra cash.
You might be needing a rebuild soon if oil pressure is down considerably.
40-60 PSI @ 2000 RPMS running @ operating temperature. Monitor over about 30 minutes, so the oil is good and hot. Older engines tend to run about 40-45 PSI running this test. Less than 40 and you are not getting sufficient oiling of the bearings.
Usually low oil pressure is a sign of bad bearings (cam and crank), plugged pick-up screen in the pan, or the check valve on the pump has a weak spring.
STP doesn't fix problems, it only masks the symtoms.
HV pump probably won't do you much good. I wouldn't spend the extra cash.
You might be needing a rebuild soon if oil pressure is down considerably.
40-60 PSI @ 2000 RPMS running @ operating temperature. Monitor over about 30 minutes, so the oil is good and hot. Older engines tend to run about 40-45 PSI running this test. Less than 40 and you are not getting sufficient oiling of the bearings.
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From: Concord, New Hampshire
well im gonna just go with a standard volume, my oil pressure isnt bad, its at the the o or r in normal, but it sometimes dropps to just below the safe line when you get off the highway and stop, from like 70 to nothing in a few hundred feet, but i dont think thats bearings, i just wanted to know high volme or not, im gonna replace the pump when i do the pan and gasket, i cant see taking it out then putting the old one back in, are there any prep steps for the new pump though before firing it up after the install?
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From: Central Virginia
If I were you, I would purchase and install a "real" oil pressure gauge before you do anything. 104,000 is up there enough, that the main bearings could be worn. The 302 that I am replacing has around 120,000. It has great oil pressure when cold, but will drop to 20 PSI or below at hot idle after a run. (With 20W50 oil) I tried to kid myself for awhile, but have faced the fact that it is time for a fresh engine.
I would not go to the trouble of replacing the oil pump only to find that the bearings were the problem. You can pick up a mechanical oil pressure gauge for not a lot of $$....
I would not go to the trouble of replacing the oil pump only to find that the bearings were the problem. You can pick up a mechanical oil pressure gauge for not a lot of $$....
Last edited by Technonut; Jul 29, 2004 at 05:52 PM.
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