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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

Re: No Hydraulic Action

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Tall T

08-08-2014 14:06:00
24.108.0.163



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"Your gauge is showing 2-3 inches of mercury - 1-1.5 PSI. That isn't anywhere close to being a problem."

Oh, I get it now . . . I think.

The guage only indicates the restriction of oil flow

through the filtering medium. As the filtering medium becomes more and more saturated, the psi increases to the red zone. but even if the vacuum pressure on the guage is in the red, indicating a saturated filter, oil flow is not proportionally restricted to the pump as the oil then simply bypasses the loaded filter on the way to the pump.

What is the input oil pressure at the vane pump?

Thanks,

Terry
This post was edited by Tall T at 14:43:10 08/08/14.

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TheOldHokie

08-09-2014 04:47:56
71.176.182.141



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 Re: No Hydraulic Action in reply to Tall T, 08-08-2014 14:06:00  

Tall T said: (quoted from post at 17:06:00 08/08/14) "Your gauge is showing 2-3 inches of mercury - 1-1.5 PSI. That isn't anywhere close to being a problem."

Oh, I get it now . . . I think.

The guage only indicates the restriction of oil flow

through the filtering medium. As the filtering medium becomes more and more saturated, the psi increases to the red zone. but even if the vacuum pressure on the guage is in the red, indicating a saturated filter, oil flow is not proportionally restricted to the pump as the oil then simply bypasses the loaded filter on the way to the pump.

What is the input oil pressure at the vane pump?

Thanks,

Terry


No - I'm afraid you don''t got it now.
  1. Oil is being sucked in by the pump and input oil pressure at the pump inlet is NEGATIVE with respect to air pressure.
  2. If properly installed (i.e placed between outlet port on the filter and pump) that gauge is showing you the VACUUM at the inlet port on the pump.
  3. If improperly installed (e.g. placed between the inlet on the filter and the reservoir) it is showing you the VACUUM on the inlet to the filter which will be lower than on the pump - much, much lower if the filter is clogged and there is no bypass in the head.
  4. IF your filter head has a bypass in it and the oil is not overly thick the inlet vacuum on the pump will never be greater then the bypass pressure.
Sounds like you don't have a good handle on what exactly you have and I'd suggest you correct that by replacing both the head and the filter with KNOWN commodities. Cost for a Zinga 3 PSI bypass head and a 100 mesh (140u) strainer is about $50 bucks.

TOH
This post was edited by TheOldHokie at 04:52:01 08/09/14.

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