High Pressure oil pump
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Joined: Aug 2005
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High Pressure oil pump
I just bought a '72 F-100. The seller told me it had been rebuilt last year. He had also put a high pressure oil pump on the 302 engine. When driving it home, oil pressure pushed the dip stick up and I began to lose oil. I put the dipstick back in and later the pressure blew out the PCV valve and its grommet. There is also significant blow-by. My question is, can this be due to the high pressure oil pump? The pressure on the gauge holds at 50 psi when doing 60 mph. ( this is with the PCV hole in the valve cover open and the PCV plugged. Would putting the stock oil pump back in help or is the blow-by telling me to re-rebuild?
Logistics Pro
Joined: Apr 2005
Posts: 4,221
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Originally Posted by yellow72f100
yes, it has suction. Can a significant amount of blow-by be caused by anything but bad rings?
Almost every vehicle I've bought came with the "the engine's just been rebuilt" line.
I don't believe it unless I see paper with lots of $$$$ signs on it.
Cargo Master
Joined: Apr 2004
Posts: 2,574
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From: Golden, CO
Gorsh! All the used motors I look at have "10K on a rebuild." That's why I ask to do a compression test: it is what it is, nothing else.Gummed up, or "sticky" rings could cause a bad seal, a quart of M.M.O. or ATF on top of your normal oil fill will free any gummed up parts-lifters included. Did the motor sit before you bought it? Did the PO use cheap oil? Could be that the rings need to re-seat, a 20 minute process if the motor was broke in properly.
Poor valve seal wouldn't cause blow by, but it can affect manifold vacume. Low manifold vacume would result in poor PCV operation. Other things that can affect intake manifold vacume include choice of cam (overlap), valve timing, leaks in the intake or vacume hoses, cylinder seal (the rings again).
The "high pressure" oil pump sounds dubious, but it's short of an Aha! Did the "rebuild" include machining? I think it's a reasonable request to obtain all reciepts and build specifics, including part numbers. Could be a poor break in, or mis-matched parts.
Gather all the information you can. Do a dry/wet compression test, check manifold vacume. Start asking questions in the 302 specific forum.
Good luck, Mike
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Joined: Jan 2003
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From: 3rd Rock
Originally Posted by yellow72f100
I just bought a '72 F-100. The seller told me it had been rebuilt last year. He had also put a high pressure oil pump on the 302 engine. When driving it home, oil pressure pushed the dip stick up and I began to lose oil. I put the dipstick back in and later the pressure blew out the PCV valve and its grommet. There is also significant blow-by. My question is, can this be due to the high pressure oil pump? The pressure on the gauge holds at 50 psi when doing 60 mph. ( this is with the PCV hole in the valve cover open and the PCV plugged. Would putting the stock oil pump back in help or is the blow-by telling me to re-rebuild?
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Postmaster
Joined: Jul 2005
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Welcome, Yellow72f100,
A good start to diagnosing this, is to give your engine a compression test. What are the readings on the engine for the compression test?
What the vacuum pressure on your engine?
A good start to diagnosing this, is to give your engine a compression test. What are the readings on the engine for the compression test?
What the vacuum pressure on your engine?
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Senior User
Joined: May 2005
Posts: 174
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From: Arlington Texas
13 seems a bit low to me my vac guage has the color code on it and it want 17 to be in time have you checked timing? Anyone know about the oil limiters some motors use if they used plugs instead of orfaces would this cause a crankcase pressure problem?
Pull the dip stick and tie wrap a balloon to it and see if your motor will blow up the balloon Don't know what this means just wanting to know if it would do it!
Pull the dip stick and tie wrap a balloon to it and see if your motor will blow up the balloon Don't know what this means just wanting to know if it would do it!
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