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08-15-2020, 03:42 PM | #1 |
Senior Member
Join Date: Dec 2013
Location: Waxahachie, Texas
Posts: 949
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Oil pressure drop
At engine startup on my '40 Ford with stock engine, my oil pressure gauge reads 45+ lbs of pressure on the factory gauge and has done this for quite a few years. After driving for 20-30 minutes and the oil is up to temperature the gauge reads around 10 lbs going down the road and maybe 5 lbs. at idle. My oil pressure sending unit is an old one; maybe the original.
My questions are: - Is the sending unit malfunctioning perhaps due to age? - Is it possibly a weak pressure relief spring playing tricks when the oil gets hot? - Is it a faulty gauge? (it's old too) ...or a combination of the above? I want to make sure I am diagnosing my problem before I order and replace a part unnecessarily. |
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