High oil pressure
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Laughing Gas
Joined: Oct 2010
Posts: 997
Likes: 2
From: Rock Valley, IA
High oil pressure
For a while now I've noticed that my oil pressure is reading high on the gauge. Every now and again it'll go down into the "normal" range. I think the oil pump check valve is stuck but wondered if there is anything else I can check. So far nothing has blown or popped but I feel as if it is a matter of time. I don't know what PSI I'm running as I haven't installed my aftermarket gauge yet but I think it's around 70-80. I think this is rather high. I just dread having to take out the oil pump. So, please, PLEASE tell me that may not be what it is. 
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Ok, that's not what it is. 
Actually, it really may not be. How cold is it there? What oil are you running? Dad's truck has both the stock gauge as well as an after market one. And, with the straight 30 weight oil it sees 70 psi frequently until the engine gets completely warm, like maybe 30 miles of driving. Then it'll be down to 35 to 40 psi at highway speeds. And, even when the pressure is around 70 on the add-on gauge the stock gauge isn't too high.
So, what are your symptoms, what oil are you running, how cold is it, ......?
Actually, it really may not be. How cold is it there? What oil are you running? Dad's truck has both the stock gauge as well as an after market one. And, with the straight 30 weight oil it sees 70 psi frequently until the engine gets completely warm, like maybe 30 miles of driving. Then it'll be down to 35 to 40 psi at highway speeds. And, even when the pressure is around 70 on the add-on gauge the stock gauge isn't too high.
So, what are your symptoms, what oil are you running, how cold is it, ......?
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Laughing Gas
Joined: Oct 2010
Posts: 997
Likes: 2
From: Rock Valley, IA
It's gotten down below 30 here in the mornings. I'm running Mobil 10w30 in there now. I guess I didn't drive it that far when I changed the oil today. I just worry that I'll have to fix a major problem just after rebuilding this engine. A little paranoid. I'll take it out this weekend and see what happens. I guess I may have jumped the gun a little bit. Just don't want to have any major issues.
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
I don't think you have a problem. You probably don't have very many miles on it so tolerances are tight, which makes the oil pressure go up, as do cold temps. I was surprised Dad's 351M had that kind of pressure, especially since they are notorious for low pressure, but then when it came down after everything got warm I understood.
Take it out and drive it to see what happens after it does get warm. I'll bet it comes down as well. But, even if it doesn't I'm not sure you have a problem. I replaced the relief spring in my '69 Super Bee's 383 with one from a Hemi back in '69 and then drove it over a 100,000 miles. It had pretty high pressure as well but didn't use any oil or have bearing problems. And, the bearings are really what could be the issue as too much pressure can cause bearing erosion over a period of time.
Again, drive it and find out what you have when hot.
Take it out and drive it to see what happens after it does get warm. I'll bet it comes down as well. But, even if it doesn't I'm not sure you have a problem. I replaced the relief spring in my '69 Super Bee's 383 with one from a Hemi back in '69 and then drove it over a 100,000 miles. It had pretty high pressure as well but didn't use any oil or have bearing problems. And, the bearings are really what could be the issue as too much pressure can cause bearing erosion over a period of time.
Again, drive it and find out what you have when hot.
Lead Driver
Joined: Jul 2009
Posts: 6,477
Likes: 19
From: Sheffield, AL
lavatan,
Was it only the oil pressure or did the fuel level and temperature also read high? The instrument voltage regulator controls all three gauges and can cause false readings when it malfunctions.
Was it only the oil pressure or did the fuel level and temperature also read high? The instrument voltage regulator controls all three gauges and can cause false readings when it malfunctions.
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Laughing Gas
Joined: Oct 2010
Posts: 997
Likes: 2
From: Rock Valley, IA
Well, the fuel gauge(s) don't work. The temperature never gets hot. I have both the stock gauge and an aftermarket and they read the same. The battery gauge doesn't work either as it always reads in the middle (unless it's supposed to).
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Moderator
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From: Virginia
Another person loosing sleep and spending money because of what the crappy factory gauges are telling them. What is "normal"?
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Laughing Gas
Joined: Oct 2010
Posts: 997
Likes: 2
From: Rock Valley, IA
Haven't spent any money yet, unless you count the couple of thousand rebuilding the motor. Before I do anything I'm going to hook up my mechanical gauge and see where I'm at. After all the posts I'm thinking the motor is still tight and that's where the high oil pressure is coming from.
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