I agree about eliminating the gauges. Is the alarm controlled by the
same sending unit as the gauge? If it is you could try swapping
sending units between the two engines to see if the problem moves.

If the alarm has it's own sending unit then the fact that the gauge
went to zero and the alarm went off suggests it really is an oil
pressure problem.

It can take a little bit for the lifters to leak down enough to cause
clacking but it is interesting that did not happen. Unfortunately
bearing damage starts almost immediately without oil pressure so
running it to see if the lifters leak down is not really a good idea.

Eisboch wrote:
"Eldon" wrote in message
oups.com...


You said the oil pressure went down to zero. Sounds kind of strange.
A friend in the marine business once told me that a problem like this
(one that occurs after the engine was worked on) is always related some
how to the last repair. I would guess they might have bumped the oil
pressure sending unit or its wire. Give the wire a look and see if its
a tight fit. Before I did anything major at this point, if the
sending unit and wire looks OK, I would replace the sending unit and/or
remove the sending unit and temporarily attach a mechanical guage to
the engine and get a real pressure reading. The reasoning behind this
if the face you said the enging sounded fine even after the pressure
went down to zero.

Regards, Bob


What he said.

Eisboch