5,7 Merc. Oil pressure question

[vitali69]

Hi All
I have 5.7 Mercruiser 1995. On idle pressure of oil 32-33 Psi. 3200 RPM - 37 Psi. This pressure normal? Or I should change the Oil pump? Engine 350 hr.
Thanks for advice

 

[Silvertip]

Re: 5,7 Merc. Oil pressure question

Yes - No. 10 PSI/1000 rpm is pretty normal for a small block Chevy.

 

[Don S]

Re: 5,7 Merc. Oil pressure question

Is that the real oil pressure, or just what shows on your gauge?

 

[vitali69]

Re: 5,7 Merc. Oil pressure question

This that that shows the gauge, ( it new)

 

[fishmen111]

Re: 5,7 Merc. Oil pressure question

I think you might need a new sender. 4psi difference between 850 and 3200rpm? I don't think so. Your 37psi is fine. Clogged sender, cheap fix.

 

[vitali69]

Re: 5,7 Merc. Oil pressure question

But the last owner of a boat, has changed on new sender ,the half year ago

 

[Coors]

Re: 5,7 Merc. Oil pressure question

Go to napa, autozone, get a $20 mechanical gauge, and test it.

 

[Don S]

Re: 5,7 Merc. Oil pressure question

But the last owner of a boat, has changed on new sender ,the half year ago

Faulty gauge, sender, corroded wiring, all can cause a false reading. As Coors stated, get a mechanical gauge and find out what is really going on.

 

[vitali69]

Re: 5,7 Merc. Oil pressure question

Thanks guys, I shall check up, I that I go next week in offshore.

 

[Coors]

Re: 5,7 Merc. Oil pressure question

Offshore? you need a factory manual, and read it, first.
And take the spare parts you might need. And tools.

 

[vitali69]

Re: 5,7 Merc. Oil pressure question

o yes