Oil pressure documentation

Matt_INW · Dec 17, 2019

I’ve been searching here and online and while I’ve found talk of expected oil pressure, I’ve not found actual documentation, proof.

The subject came up in a discussion in having and one or two people think I’m crazy and are saying under 20psi oil pressure hot is bad.

Does anyone have a link or verbatim from a manual?

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Matt_INW · Dec 17, 2019

To clarify I’m 10psi or so hot at low idle, in-line with what I expect.

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1992 idi 73 · Dec 17, 2019

I've never actually tested mine but the needle kinda floats around the N on the idiot gauge.

frankenwrench · Dec 17, 2019

I can't verify but mine always reads 25 hot idle and 48 under load on several different manual guages. And ensuring the line is full of oil made no difference on any of them. As I am sure this is 100% incorrect due to reading 10-11 psi is normal, I'm not sure we're u would find that literature. I'm sure someone here will post up a manual of sorts. Mayby a Chilton or Haynes manual?

Scotty4 · Dec 17, 2019

I read 10 at idle and around 50-60 cruising the highway. IIRC someone on here stated anything above 10psi is good and will of course increase with rpm.

Scotty4 · Dec 17, 2019

To add from FTE:

According to the 1984 Ford Truck Shop Manual, the 6.9L engine specs are:

Curb idle: 10 psi. @ 2200 RPM: 40 - 60 psi

typ4 · Dec 17, 2019

Mines been 15ish hot idle for years and 100k miles

BlackNoma · Dec 17, 2019

mine's about that iirc

hot: 15/45
cold: 25/75

Matt_INW · Dec 17, 2019

Thanks all, much appreciated.

Mine is about 35psi at 2,000 rpm hot.

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Cubey · Dec 17, 2019

Scotty4 said:
To add from FTE:

According to the 1984 Ford Truck Shop Manual, the 6.9L engine specs are:

Curb idle: 10 psi. @ 2200 RPM: 40 - 60 psi

That's about what the aftermarket mechanical gauge a past owner installed on my F250 reads.

IDIBRONCO · Dec 17, 2019

Matt_INW said:
Thanks all, much appreciated.

Mine is about 35psi at 2,000 rpm hot.

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Sounds fine to me. A general rule of thumb is 10 PSI for every 1000 RPM the engine is turning. Since your idle speed should be well under 1000 RPM, 10 PSI at a hot idle is just fine on any truck engine, gas or diesel.

Mishka · Dec 20, 2019

Mine doesn't work, I'm still trying to wrap my head around installing my mechanical oil pressure gauge

IDIBRONCO · Dec 20, 2019

Mishka said:
Mine doesn't work, I'm still trying to wrap my head around installing my mechanical oil pressure gauge

It's not really difficult. If you have any questions, just ask. This is one of the FEW places that free advice is worth more than the price tag.

chris142 · Dec 20, 2019

12 hot idle. 38 hot driving
Never more than 38.

papadiesel · Dec 23, 2019

Our engine is a high volume low pressure oil pressure system anything around 10 at is quite good

Oil pressure documentation

Matt_INW

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Matt_INW

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1992 idi 73

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frankenwrench

overkill is under rated!

Scotty4

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typ4

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BlackNoma

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Matt_INW

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Cubey

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IDIBRONCO

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Mishka

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IDIBRONCO

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