Oil presure

[pushnwood]

What should it be on a mercruiser 5.7, at idle & on the gas?

 

[Alpheus]

Re: Oil presure

Stock at least 10 psi per 1000 rpms...

 

[Summer Fun]

Re: Oil presure

Stock at least 10 psi per 1000 rpm

Huh ?? . My girls hold 40psi at idle and at WOT.

 

[NYBo]

Re: Oil presure

That's because yours are in excellent mechanical condition, Wayne (and stop bragging!). The minimum spec is, well, the minimum acceptable. Lower than that indicates a problem, possibly very major.

 

[Summer Fun]

Re: Oil presure

So if my math is right ??. That means 6psi at idle at 600 rpm !!!.

 

[NYBo]

Re: Oil presure

So if my math is right ??. That means 6psi at idle at 600 rpm !!!.

It's not usually linear like that. Not to mention that oil gauges aren't terribly accurate at such low levels.

 

[pushnwood]

Re: Oil presure

I'm getting 20 at idle & 40 wot. The motor has only 300 hrs.

 

[6meter]

Re: Oil presure

Getting something at idle and 40ish off idle is ok.

 

[45Auto]

Re: Oil presure

2001 and up Mercruiser 5.0L, 5.7L, & 6.2L oil pressure specs:

 

[KJSmitty]

Re: Oil presure

What should it be on a mercruiser 5.7, at idle & on the gas?

For comparison/using stock dash gauge:

My 2003/150 hr 5.7 with either 20W-50 or a straight 30 weight at op temp:

@ idle/~550 rpm: 20-25 psi.

@ WOT: 65-70 psi

 

[pushnwood]

Re: Oil presure

Thanks for all the replies, looks like the oil presure is ok. My last boat had a big block & the oil presure stayed at 40psi all the time.