High oil pressure
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Cargo Master
Joined: Oct 2010
Posts: 2,339
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From: Lost In a Pit of Despair
High oil pressure
Just finished with my 460 engine swap, and when I started driving the truck, my oil pressure was rather high. During normal idle, it hovers just before the top end of the normal range. But after some highway driving time, it can get up to just above normal range.
Any ideas?
Jameson
Any ideas?
Jameson
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
The stock gauge won't tell you much. "Just before the top of the normal range" is subjective; it doesn't mean the same thing from truck to truck. To really understand what's going on, you should install an aftermarket mechanical gauge. But as a first pass, if you want to troubleshoot the system you've got, the sending unit may be off. It's normal for oil pressure to decrease once the engine warms up, but your sending unit may be adding an offset.
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Cargo Master
Joined: Oct 2010
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Likes: 32
From: Lost In a Pit of Despair
Could it maybe be because of too much oil? I put the recommended 6 qts in (fresh, blueprint engine), but I don't have a dipstick, so I don't know if there's too much/little oil in the system
Jameson
Jameson
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
The amount of oil doesn't have anything to do with the pressure, to a first order. It's not like it pumps more oil more quickly because there's more oil in the crankcase. Oil pressure is a function of the force delivered by the pump, and the resistance to flow presented by the engine (i.e. bearing clearances).
It is possible that if the oil level is too high, the rotating assembly will actually churn the oil in the crankcase, which will aerate the oil. However, this decreases oil pressure.
Like MH said, there's really not much you can do until you have the proper diagnostic tools. How much PSI do you have if the needle is between the "A" and the "L" in "NORMAL?" Is it 40 PSI? Is it 45 PSI? I don't know. I would definitely be using a gauge if this is a rebuilt engine with money invested.
It is possible that if the oil level is too high, the rotating assembly will actually churn the oil in the crankcase, which will aerate the oil. However, this decreases oil pressure.
Like MH said, there's really not much you can do until you have the proper diagnostic tools. How much PSI do you have if the needle is between the "A" and the "L" in "NORMAL?" Is it 40 PSI? Is it 45 PSI? I don't know. I would definitely be using a gauge if this is a rebuilt engine with money invested.
Thread Starter
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Cargo Master
Joined: Oct 2010
Posts: 2,339
Likes: 32
From: Lost In a Pit of Despair
The amount of oil doesn't have anything to do with the pressure, to a first order. It's not like it pumps more oil more quickly because there's more oil in the crankcase. Oil pressure is a function of the force delivered by the pump, and the resistance to flow presented by the engine (i.e. bearing clearances).
It is possible that if the oil level is too high, the rotating assembly will actually churn the oil in the crankcase, which will aerate the oil. However, this decreases oil pressure.
Like MH said, there's really not much you can do until you have the proper diagnostic tools. How much PSI do you have if the needle is between the "A" and the "L" in "NORMAL?" Is it 40 PSI? Is it 45 PSI? I don't know. I would definitely be using a gauge if this is a rebuilt engine with money invested.
It is possible that if the oil level is too high, the rotating assembly will actually churn the oil in the crankcase, which will aerate the oil. However, this decreases oil pressure.
Like MH said, there's really not much you can do until you have the proper diagnostic tools. How much PSI do you have if the needle is between the "A" and the "L" in "NORMAL?" Is it 40 PSI? Is it 45 PSI? I don't know. I would definitely be using a gauge if this is a rebuilt engine with money invested.
Is there any other way to measure pressure without a gauge? I have another
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Cargo Master
Joined: Oct 2010
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From: Lost In a Pit of Despair
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Posting Guru
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From: Mississippi
You need a gauge, also I would strongly suggest a dipstick, there are some things you really just cant do without...........
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Cargo Master
Joined: Oct 2010
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From: Lost In a Pit of Despair
Suggestions for an aftermarket dipstick tube?
Elder User
Joined: Feb 2011
Posts: 633
Likes: 1
From: Grande Prairie, Alberta
Aftermarket dip sticks for the 460 are few and far between and the ones that are out there are close to $100. The wreckers wouldn't sell me one because they were trying to sell the complete engine. I ended up going to a pick a part and getting one, $2 I think.
Posting Guru
Joined: Dec 2009
Posts: 2,134
Likes: 1
From: Mississippi
Heres some:
460 dipstick,dip stick | eBay
Little pricey: 460 Dipstick Tube, with o-ring
Im sure there are more, that took 2 mins on google
460 dipstick,dip stick | eBay
Little pricey: 460 Dipstick Tube, with o-ring
Im sure there are more, that took 2 mins on google
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Cargo Master
Joined: Oct 2010
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Likes: 32
From: Lost In a Pit of Despair
Now the timing chain cover on the new engine has a factory intalled cap over the dipstick tube. I have another timing chain cover (identical casting number) that has the dipstick tube in it. Is there a way to get the tube from one to the other?
Fleet Mechanic
Joined: Feb 2007
Posts: 1,326
Likes: 48
From: Middle TN
For a cheap oil pressure gauge.
Buy a Mechanical gauge, Autozone or off of ebay. I like Stewart-Warner and it doesn't matter what size. Then buy a flexible grease gun hose. Screw these together with a female adapter. Then the hose end will screw directly into the engine block in place of the oil sender. I have used one for years to check oil pressure on different engines.
Buy a Mechanical gauge, Autozone or off of ebay. I like Stewart-Warner and it doesn't matter what size. Then buy a flexible grease gun hose. Screw these together with a female adapter. Then the hose end will screw directly into the engine block in place of the oil sender. I have used one for years to check oil pressure on different engines.
Senior User
Joined: Oct 2007
Posts: 127
Likes: 0
From: three rivers, ma
if you just need the pressure gauge for diag go to hf or any place that sells auto tools and get a mech. oil pressure guage like this Engine Oil Pressure Test Kit
follow directions in the box or pm me and ill help you out.
a general guideline you want about ten psi for each thousand rpm
follow directions in the box or pm me and ill help you out.
a general guideline you want about ten psi for each thousand rpm
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