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EFV-8 Club Forum / General Ford Discussion / Oil Pressure Gauge pegging the needle

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Discussion Topic: Oil Pressure Gauge pegging the needle

nelsb01

06-25-2018 @ 6:08 AM

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Thanks for the input guys.
I will check the electrical wiring and connections.
The gauge reading this past weekend was per usual, so if a piece of dirt, it may have moved on (hopefully into the filter).

40 Coupe

06-25-2018 @ 4:29 AM

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Beside the above electrical I have found that the pressure senders can block up with sludge. If you remove it and take a small drill, BY HAND, you can remove the blockage from the hole. Do not force the drill into the hole! You can damage the brass diaphragm inside. Then spray some cleaner deep into the hole and clean out the sludge. When they block they usually read high.

TomO

06-24-2018 @ 7:48 AM

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The sending unit wire may have grounded somewhere in its length, but more likely at one of the connections. Moisture and dirt could also have caused a grounded condition.

Tom

This message was edited by TomO on 6-24-18 @ 7:51 AM

kubes40

06-23-2018 @ 8:00 PM

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There may be one or more things that have gone amiss. The easiest way to check is to "add" temporally a mechanical gauge and see what you truly have for pressure. then, move backwards of sorts by replacing one unit at a time. Typically, the sending unit becomes defective much more often than the dash gauge.

By the way, oil level and pressure have only a very little to do with one another. Obviously if you are out of oil or extremely low, the pressure may suffer. However, if the bearings, etc. are not within specification, it won't matter how much oil you have.

Mike "Kube" Kubarth

nelsb01

06-23-2018 @ 7:46 PM

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1949 Ford. Original V-8 8BA engine with 53000 miles on it. Engine was rebuilt 23 years ago and is std. Oil changed last fall and checked clean before heading to Dearborn. The oil gauge usually reads just below 80 lbs when at speed, and around 30 lbs at idle (stoplights) On the way home, I noticed while at around 55 mph, that the needle was way past the 80 lb marker and almost to the farthest most point on the gauge. Stopping reveled that the oil level was in the SAFE zone and still clean. I added a pint and the level was now at FULL. Starting again and up to speed, the needle continued to read well above 80 lbs. Since I knew what the oil level was, I continued driving. I noticed that the needle eventually went back to around 80 lbs. The high pressure did not happen again for the rest of the trip.
Did a piece of dirt cause this? A worn gauge? A bad sending unit? Or just a weary driver after a long Meet?

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