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Old 04-28-2009, 10:50 AM
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High Oil Pressure Problem

Just started the 32 from its winter hiatus. It is a 327/275 (68 vintage) and as far as I know has never been opened. Anyway, I started it up, it had very high oil pressure on start up. I thought that it would calm down once it got warm and lubed up. I took it for a 10 mile drive and the oil pressure at RPM stayed at 70#'s. When it sits at idle the pressure comes down to 30#'s but it is slow to re-act to the decrease in RPM. Is it possible that something got into the pressure line and is giving me a false reading. I had just changed oil in the unit prior to putting it away for the winter. I believe that I have 10w30 Valvoline in it but I could be wrong there. Does anyone have a starting point that I should look at first before pulling the oil and filter and the oil line off of the gauge?

Thanks for any help.

Steve

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Old 04-28-2009, 11:15 AM
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What was the normal oil press. before you put her away for winter? I just refired my '32....331" sbc with stock M-55 oil pump (sitting in chassis only). It was about 55 deg. outside, it went right up to 70 psi and stayed there for about 5-7 mins. till i shut it off. I'm running 30 wt. Rotella w/ZDDP+ for now as a break in. 10w30 might have given me a little less psi.....

I really don't think you're psi is above normal but thats why I was asking what it was before. You might try just changing the filter first and see how that works.
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Old 04-28-2009, 12:04 PM
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Methinks the gauge is kaput. What kind of gauge package do you have? Mechanical or electric? Have you tried changing the head to see if there is a difference. Or, put a mechanical gauge right on the engine and start it up and read the oil pressure.
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Old 04-28-2009, 12:14 PM
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Quote:
Originally Posted by reflog
Just started the 32 from its winter hiatus. It is a 327/275 (68 vintage) and as far as I know has never been opened. Anyway, I started it up, it had very high oil pressure on start up. I thought that it would calm down once it got warm and lubed up. I took it for a 10 mile drive and the oil pressure at RPM stayed at 70#'s. When it sits at idle the pressure comes down to 30#'s but it is slow to re-act to the decrease in RPM. Is it possible that something got into the pressure line and is giving me a false reading. I had just changed oil in the unit prior to putting it away for the winter. I believe that I have 10w30 Valvoline in it but I could be wrong there. Does anyone have a starting point that I should look at first before pulling the oil and filter and the oil line off of the gauge?

Thanks for any help.

Steve
You started this up with oil that had sat over winter in the pan? The stuff probably has the consistancy of glue, dump it!

Bogie
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Old 04-28-2009, 02:57 PM
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Quote:
Originally Posted by 327NUT
What was the normal oil press. before you put her away for winter? I just refired my '32....331" sbc with stock M-55 oil pump (sitting in chassis only). It was about 55 deg. outside, it went right up to 70 psi and stayed there for about 5-7 mins. till i shut it off. I'm running 30 wt. Rotella w/ZDDP+ for now as a break in. 10w30 might have given me a little less psi.....

I really don't think you're psi is above normal but thats why I was asking what it was before. You might try just changing the filter first and see how that works.

My memory is a little faded about the exact pressure but I think it was running somewhere in the neighborhood of 50 to 55#'s pressure last year. You also have to remember that yours is a new motor. Mine is old, old. So the running pressure should be down from yours.
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Old 04-28-2009, 02:58 PM
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Quote:
Originally Posted by alittle1
Methinks the gauge is kaput. What kind of gauge package do you have? Mechanical or electric? Have you tried changing the head to see if there is a difference. Or, put a mechanical gauge right on the engine and start it up and read the oil pressure.


Mechanical, Auto Gage (brand) made by Auto Meter. I could try the direct gauge to the engine if all else fails.
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Old 04-28-2009, 03:01 PM
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Quote:
Originally Posted by oldbogie
You started this up with oil that had sat over winter in the pan? The stuff probably has the consistancy of glue, dump it!

Bogie


Oil was consistancy of Oil not glue. Remember, I just changed oil prior to putting the car away. It was clean and when I pulled the dip stick it ran off of it. I doubt that the oil is the problem.
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Old 04-28-2009, 03:58 PM
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That's a good gauge that you have there, What have you got it connected to, black plastic tube or clear?

With the tube off the gauge head and engine fitting, take a gun type oil can and pre-load the tube with oil by squirting it in, seal off the lower end by putting it back on the engine fitting, and then connect to the head end. Then start it up to check the oil pressure. OR, You can just disconnect the head end, fire it up with the open end pointed into a clear drink bottle until oil spirts out, shut off engine and reconnect, but that could make a hell of a mess sometimes.
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Old 04-28-2009, 04:28 PM
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Quote:
Originally Posted by alittle1
That's a good gauge that you have there, What have you got it connected to, black plastic tube or clear?

With the tube off the gauge head and engine fitting, take a gun type oil can and pre-load the tube with oil by squirting it in, seal off the lower end by putting it back on the engine fitting, and then connect to the head end. Then start it up to check the oil pressure. OR, You can just disconnect the head end, fire it up with the open end pointed into a clear drink bottle until oil spirts out, shut off engine and reconnect, but that could make a hell of a mess sometimes.


I'll print your response and maybe try that. It may get messy but I think I can keep it contained by simply using a large plastic milk jug to put it into when I start the unit up. I did not use the black plastic or the clear. I used old school and went with copper. I don't like the fact that the plastic can get hard and brittle over the years and simply crack on its own, so I went to the hard line.
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Old 04-28-2009, 04:34 PM
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The oil pump's bypass could be sticking after sitting up.

You might try just driving it around some- let it heat cycle a half dozen times or so and see if the problem doesn't resolve itself.
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