Extremely high base oil psi

[DEEZUZ]

Cold the pressure reads about 112 psi @ WOT. Once warm psi is 82 WOT. Inspected pressure regulator. It was fine but I did go ahead and try a new one. No change. It Blew out a new oil pressure sending unit so there definitely is a concern with this pressure I'm seeing.

 

[Luke@MillerPerformance]

Sure it wasn't just a bad oil pressure sender? What oil is in it?

 

[DEEZUZ]

15w40. Highly doubt it. I've installed hundreds. The regulator should bleed off anything over 75

 

[DEEZUZ]

Has to be a restriction in the relief port.

 

[DEEZUZ]

One thing I can't find in all my information is where exactly that excess oil is bled off to. And I don't have a front cover off at the moment to verify it.

 

[Cutting-Edge Diesel]

our ranger would always spike to 100psi when we would rev it when the oil was cold. but no oil pressure sending unit problems.

 

[DEEZUZ]

I would expect and have seen 100, but when it's single digit Temps. Not summer time, and not 82 psi when oil is thin @ op temp

 

[tbsimmons]

Have not built a diesel but what is the relief spring in the oil pump set at?

 

[Luke@MillerPerformance]

I would expect and have seen 100, but when it's single digit Temps. Not summer time, and not 82 psi when oil is thin @ op temp

I think normal is around 65. I have a front cover at the shop I check out tomorrow.

 

[webb06]

What is the main concern the truck was brought in? Oil leaks? Or leaking from the sending unit?


Sent from my iPhone using Tapatalk

 

[DEEZUZ]

the relief is set to 75 psi. anything over then it over comes the spring pressure and bleeds off.. issue is i cant find out where it bleeds off to, to check for obstruction.

the complaint was it was leaking oil. I found the NEW sending unit blown out. Then I verfied with 2 mechanical gauges what pressure was. IMO its very high and will blow out the sender again or turbo seal perhaps

 

[webb06]

the relief is set to 75 psi. anything over then it over comes the spring pressure and bleeds off.. issue is i cant find out where it bleeds off to, to check for obstruction.

the complaint was it was leaking oil. I found the NEW sending unit blown out. Then I verfied with 2 mechanical gauges what pressure was. IMO its very high and will blow out the sender again or turbo seal perhaps

Looks like excess pressure is returned to inlet side of pump.



Sent from my iPhone using Tapatalk

 

[DEEZUZ]

Yes I verified that today as well. Still at a loss here

 

[DEEZUZ]

I bet it's relived through the tiny port in the oil pump cover. I might pop that off

 

[webb06]

I bet it's relived through the tiny port in the oil pump cover. I might pop that off

That where I'd start


Sent from my iPhone using Tapatalk

 

[DEEZUZ]

66 psi cold idle and 96 wot cold under load.

Hmm... Might ship it.

 

[DEEZUZ]

101 psi in neutral wot with oil @ 100°.

Thinking about tossing a flush in the oil as well.

 

[webb06]

Any updates?


Sent from my iPhone using Tapatalk

 

[DEEZUZ]

Sorry. Tossed in New sender and shipped it. Next day cold wot full load was 96psi

 

[DEEZUZ]

Also tore off a oil pump on another motor and verified the bleed off port. Still puzzling why this truck sees anything more than 75