Re: oil pressure
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Forum Ambassador
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Specs say the pressure should be 40# at normal driving so yours doesn't seem too far off. Perhaps the sender has become a bit sensitive or was the wrong range as they do come with various pressure on/off points. Here is one from the x-ref Kev found that might be worth trying or perhaps you can verify yours operates around that 20# range.
Posted on: 2011/7/7 19:33
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Howard
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Re: oil pressure
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Home away from home
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No snake oil necessary, but you might want to bump up to Rotella 20-50.
The 288 and 327 pumps are the same, no need to change. Check the thickness of the gasket under the pump cover. Sometimes they are supplied really thick, should be .005 or less. But I agree, 35psi at 40 mph is not bad. There are many running around happily with a lot less.
Posted on: 2011/7/7 19:50
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Re: oil pressure
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Home away from home
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If you have an accurate gauge i would trust that over a sender from a non-packard vendor. However i found my packard dash gauge doesn't read as accurate as the little one i mounted down by the oil sender on the block.
I heard a rule of thumb was 10psi for every 1000 rpm. 35 psi would be fine cruising. I also thought that the manual said somewhere, when hot, 10ish psi idle and 35 (or maybe 40?)psi cruising down the road. It would sound like you're right on, but i'd check the manual rather than my memory. I'm running straight 30 weight (rotella) at the moment with good luck. I was running 10-30 as my first flush after the motor swap for the first few tanks, and noticed after it was dirty that it was a good 3-5psi difference at idle, and about 5-7psi lower than the clean straight 30.
Posted on: 2011/7/7 20:23
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Re: oil pressure
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Home away from home
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thanks - I'll order a new sender and switch to straight 30 weight oil. The oil pump has the super thin gasket - looks like about the thickness of office paper.
Posted on: 2011/7/8 7:58
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Re: oil pressure
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Home away from home
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Ok - problem solved. First I put a good mechanical oil gauge on the car to test the pressure. I removed the old sender - I had put teflon tape on the threads to help seal it. Bad idea. A bit of teflon was just slightly over the hole in the sender. Stripped the tape off and reinstalled the sender. No more false alarms. Oil pressure at 40 mph is 48 psi, and about 8-10 at an idle. Life is good again.
Posted on: 2011/7/27 13:45
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Re: oil pressure
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Home away from home
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Good to hear it wasn't anything major
Posted on: 2011/7/27 14:01
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Re: oil pressure
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Home away from home
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I'm running Valvoline 50 wt racing oil (excellent quality) because of the problem you are having and have had good success.
Posted on: 2011/7/30 16:33
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Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
Dr. Seuss |
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Re: oil pressure
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Forum Ambassador
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Denny, the heavier oil like the SAE 50 you're using does give higher pressure because of it's greater resistance to flow. And a bit more "cushioning" effect.
But like so many things, there is a trade-off and in this case it's lower flow volumes and hence poorer heat transfer from bearings, etc. Which way is the better compromise I have no idea.
Posted on: 2011/7/30 17:31
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