High oil pressure

[Onexl85]

Just curious what would cause high oil pressure in a merc 5.7. Has anyone expirianced this?

 

[Alumarine]

What's the pressure, and at what RPM?

 

[Onexl85]

60psi @ 3200 rpm

 

[flipbro]

My 5.7 runs 60 psi at 3500 rpms at operating temp. I think you just got a good tight engine..Whats it drop to at idle when at operating temp?

 

[Onexl85]

Not sure, having trouble with my valve covers, no matter what I do I can't get them to stop leaking, replaced both gaskets and valve covers. The other day I popped the hatch while underway and noticed a good amount of smoke coming out of the valve cover edge. Very worried that I'm gonna be rebuilding this engine.

 

[flipbro]

That has nothing to do with oil preasure. Do you have a line from each valve cover to your spark arrester?

 

[Watermann]

Are you using cork gaskets or neoprene? The biggest problem people have when replacing valve cover gaskets is that they way over tighten the bolts thinking that will keep them from leaking.

 

[Onexl85]

Neoprene, oem quicksilver ones...... I'm just snubbing them up.

 

[Watermann]

Sounds like it may be time for some Permatex ultra black.

 

[Scott Danforth]

even if your oil pressure was 500 psi, it would not effect oil leaking from the valve covers.

60 psi is good pressure. Im running a high volume oil pump and am hitting 85psi at cruise at temp.

center bolt or perimeter?

I did ask the same question in your valve cover thread http://forums.iboats.com/forum/engi...gines-outdrives/9978505-merc-5-7-valve-covers

 

[Bt Doctur]

scott, hope you installed a deeper oil pan , too easy to pump out the 4 qts into the engine and have 0 oil pressure
the oil pressure reading with an electrical sender is relative. you either see a reading or you don't. install a mechanical to verify the actual pressure
high pressure can be :
incorrect sender/ incorrect ohms value
the oil pump, oil pump reliefe valve
wrong oil filter, clogged oil filter
spun main bearing ,spun cam bearings

 

[Onexl85]

Scott,
This engine has 4 center bolts