| PeterFord | -- 05-10-2022 @ 9:46 AM |
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I have a 51 F1. Flathead. I have had three oil pressure sending unit replacements because none of them worked. I have checked out the gauge: works perfectly (grounding test). I have pressure tested the oil at the filter unit: perfect. Still my pressure at the gauge measures only between 2 and 8 lbs. I have a new one coming from Carpenter this week. Hoping it is not defective. Previously I went through three sets of water temp sending units before I got a set that worked. I was told at the time that these things are made in China where there is little or no quality control. Any advice?
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| 51504bat | -- 05-10-2022 @ 9:56 AM |
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Check for a NOS unit with: Michael at 3rd Gen Automotive https://thirdgenauto.com/ or Fred at Southside Obsolete http://www.southsideobsolete.com/southside/Welcome.html ______________ No signature
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| ford38v8 | -- 05-10-2022 @ 11:22 AM |
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I agree on NOS units rather than any repop no matter where they were made. I’ll also clue you that on both those units, you’ll have trouble completing the electrical circuit if using Teflon tape for the thread sealer. Use the standard old fashioned pipe joint compound for best results. And for your F1, make sure the sender is an 80 lb unit, as marked on the bottom. Alan
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| PeterFord | -- 05-10-2022 @ 7:07 PM |
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can you give me any more detail on teflon tape. I have used it on the fitting that connects the oil sender to the filter. Peter
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| ford38v8 | -- 05-10-2022 @ 8:02 PM |
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Certainly. I apologize for not making it clear to you. Teflon tape acts as an electrical insulation between the unit and the block, where pipe thread compound does not. You need a complete, good electrical circuit without resistance for the units to work properly, and Teflon presents considerable resistance to that circuit. Alan
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| PeterFord | -- 05-11-2022 @ 5:54 AM |
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Thank you, Alan. Peter
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| TomO | -- 05-11-2022 @ 7:32 AM |
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Alan and Peter, You don't need to use anything to seal the threads on the sending units. Just tighten them using the force that you would app;y with a 6" wrench. That way you get the best electrical connection. Tom
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| trjford8 | -- 05-11-2022 @ 7:36 AM |
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Al gives good advice as teflon tape inhibits a good ground. Perhaps the senders you have already may work once you remove the tape. Small strings of that tape can also come loose on the end and can also wind up in your oil system. I stopped using that stuff many years ago around anything automotive that carries fluids.
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| PeterFord | -- 05-11-2022 @ 7:05 PM |
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Good advice, thank you. Peter
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