Hi and thanks for the speedy response

its was just the heads and a valve job. the head gaskets were
replaced.

the engine was warm when I changed the oil filter.

the oil pressure started to drop after I put the engine under a load.
3500 RPM's and the oil pressure dropped to zero and the red warning
light on the dash board went off





On Thu, 24 Aug 2006 10:54:43 -0400, "Eisboch"
wrote:


"Big gus" wrote in message
.. .
Help!!!

Hi all

anyone had this problem?

I have a twin engine searay
with 454's


I just hand the heads , valve's, new rocker arms, and valve springs
done in the one engine

I ran the boat at the dock for a good 8 house with no issues. I even
changed the oil several times just to be sure


I took the boat out last night and after running under load for about
15 minutes the engine in question started to lose oil pressure.

At once I shut the motor down.

I got back to the dock expecting to see oil sprayed all over my engine
compartment, but I found nothing, no leaks drips or any sigh of oil
leakage

Checked the dip stick and it was fill and very clean.

well I got back to my slip and took a look at the oil filer , it
seemed to have some stuff in it as I assumed that it would, so I
changed it, and re started the motor.

As the filter filled the oil pressure gauge jumped up, but not as high
as it should.


Anyone got any thoughts ?

on why all of a sudden I got no oil pressure?

Thanks
M


"No" or "low" oil pressure? Was the engine still warm after you changed
the oil filter?

It's perfectly normal for oil pressure to drop from a high reading to a
lower one once the engine warms up. You didn't mention doing rings, etc.,
so I assume they are original. General rule of thumb for an engine with
some hours under its belt is a minimum of 10 psi per 1000 rpm engine speed.
I can't think of a reason why a valve job would influence oil pressure,
unless the valve guides were screwed up and you were burning oil big time
although it seems like it would take longer than 15 minutes of running to
burn up most of the oil. But then again, I am not a mechanic.

Eisboch

"Big gus" wrote in message
...
Hi and thanks for the speedy response

its was just the heads and a valve job. the head gaskets were
replaced.

the engine was warm when I changed the oil filter.

the oil pressure started to drop after I put the engine under a load.
3500 RPM's and the oil pressure dropped to zero and the red warning
light on the dash board went off


Hate it when that happens. Forget everything I suggested. You have a
problem.

Eisboch

If it has oil pressure now and didn't then it sounds like the pump was
sucking air for some reason. That could be that the oil is not
getting back to the pan fast enough. Or the pickup fell off the oil
pump. Another possible explanation is that the relief valve on the
pump got stuck open for some reason.

Eisboch wrote:
"Big gus" wrote in message
...
Hi and thanks for the speedy response

its was just the heads and a valve job. the head gaskets were
replaced.

the engine was warm when I changed the oil filter.

the oil pressure started to drop after I put the engine under a load.
3500 RPM's and the oil pressure dropped to zero and the red warning
light on the dash board went off


Hate it when that happens. Forget everything I suggested. You have a
problem.

Eisboch

Had an identical problem with 2 different engines.

Either going to be heads, head gaskets, or poorly sealed intake manifold.

Ron

"jamesgangnc" wrote in message
oups.com...
If it has oil pressure now and didn't then it sounds like the pump was
sucking air for some reason. That could be that the oil is not
getting back to the pan fast enough. Or the pickup fell off the oil
pump. Another possible explanation is that the relief valve on the
pump got stuck open for some reason.

Eisboch wrote:
"Big gus" wrote in message
...
Hi and thanks for the speedy response

its was just the heads and a valve job. the head gaskets were
replaced.

the engine was warm when I changed the oil filter.

the oil pressure started to drop after I put the engine under a load.
3500 RPM's and the oil pressure dropped to zero and the red warning
light on the dash board went off


Hate it when that happens. Forget everything I suggested. You have a
problem.

Eisboch

On Thu, 24 Aug 2006 13:07:27 -0400, "Eisboch"
wrote:

You have a
problem.

Ayyyup, big time.