Oil

[Caldy]

My recently overhauled ford 2712e has 30lbs oil pressure at idle, is this acceptable?

 

[Portofino]

Yes .

 

[Caldy]

Thanks can you expand a bit plz

 

[Caldy]

It also stays at 30 when I rev ??

 

[rafiki_]

Do you know what the oil pressure should be across the Rev range? You should find info using Dr Google. Do you know that your pressure sender and gauge are working properly?

 

[Caldy]

Hi and thanks for your input. New sender / switch.
Had a temp gauge and it read the same. Hoping its not oil pump. No about the rev range will go to google

 

[Freebee]

if it stays at 30 thru the rev range something is not quite right ....check sender, gauge and pressure relief valve..... and don't rev it too much till you have it sorted!!

 

[Caldy]

How do I check the PRV. ?New sender.bud

 

[Portofino]

30 psi is fine at Idle , it always drops off the pump is configured to run at higher rpms to achieve something in the range 60 - 80 psi .
They all drop down at tick over .

How ever @ your post #4 you say it’s also 30 psi “ when I rev it “ That is not acceptable.
Needs further investigation.
As rafiki infers the sender / gauge .
Or the pic up pipe .
Or the actual oil viscosity…..I mean did it get heat into it .
Or 8hit blocking a passage way .

I understand they ( sensible engine designers ) place the sender immediately before it’s sent to the crank journals / big end shells …for obvious reasons .

 

[Caldy]

Thanks again for ur input. Is 15/40 oil ok?
Looks like taking the engine out and looking at oil pump?? Oh did I say, I'm no expert.

 

[Portofino]

Hi and thanks for your input. New sender / switch.
Had a temp gauge and it read the same. Hoping its not oil pump. No about the rev range will go to google

Expand on “ hope it’s not the oil pump “

What gave you done , or not if the case to it ? Talking oil pump ……don’t tell us you did not replace / rebuild it while in there !
Why did you “ rebuild “ it in the first place ?

 

[Caldy]

Overheating. Reground main shaft and replaced 1 con rod, hind sight should have checked pump.
But As said before not an expert buddy.

 

[ST840]

Is 15/40 oil ok?

You should always use the oil that your service manual recommends for the engine you have. Not all engines will be happy on the same oil.

 

[Caldy]

Thanks, the book is old so I don't know the modern equivalent

 

[Jamie Dundee]

Overheating. Reground main shaft and replaced 1 con rod, hind sight should have checked pump.
But As said before not an expert buddy.

What was it reading before the work was done? Mine has around 35psi when hot at tickover but that goes to 85psi at 3000rpm.

 

[Caldy]

Similar buddy

 

[Caldy]

I'm thinking I have to take the engine out and look at pump which I'm not keen to do

 

[ST840]

Try this manual, it's pretty comprehensive. Go straight to page 77 to read about oils.

https://www.kdtrading.no/file/nedlastinger/deleboker/ford/ford-2700-workshop-manual.pdf

 

[Caldy]

Thanks for that, I have that manual, I will check

 

[Portofino]

Overheating. Reground main shaft and replaced 1 con rod, hind sight should have checked pump.
But As said before not an expert buddy.

Did you fit fresh shells ?
Thing is the oil pressure drops if the crank shaft ( your main shaft - right ? ) if the shaft is loose outside spec .

So a sign of an aged high miler / hrs is as the yrs pass the oil pressure drops .
It drops because of the space / gaps that wear open between the crank ( your main shaft ) and the shells / bearings .

A nice tight good rebuilt motor shows a tad high oil pressure as the spaces are tight unworn .


Oil
Only lower viscosity artificially lower the pressure and it still rises albeit on a lower scale when revved up .
Its not the oil .Hotter oil lowers the pressure Eg racing / labouring …..charging up a alpine pass in 30 degree August air temp for example .Temp gauge rises and pressure lowers as it thins .