Not necessarily, the oil pressure gauge lines are very small
to prevent a major leak if the line breaks, in cold weather
or just with cold oil, the gauge will respond slower. That
is one of the reasons they say to allow 30 seconds for oil
pressure to show up after a start, it takes some time.

But a stuck relief valve will cause the oil pressure to go
very high instantly and that blows the seals or oil cooler
which drops the pressure before the gauge has time to
respond.


"Neil Gould" wrote in message
. net...
| Recently, Jim Macklin
posted:
|
| If it happens it will be fast, faster than the gauge
will
| likely respond. The oil pump is a set of meshed gears
that
| move the oil. They move a fixed amount with each
revolution
| of the engine. There is a spring loaded pressure relief
| valve in the pump that by-passed oil back to the pump
intake
| if the pressure is high.
| Chapter 6 of AC 65-12
|
|
http://www.airweb.faa.gov/Regulatory...0?OpenDocument
| has diagrams and explanations.
|
| Thanks, I'll look it over.
|
| During an overhaul of an engine, a valve can become
jammed,
| blocked or otherwise adversely effected. The valves
should
| be clean and function checked. But a metal chip or
other
| problem can happen and can get into a pump system.
Often
| the relief valves are stuck open and you don't get full
| pressure, but it can stick a valve closed and then the
| pressure goes up until something breaks or a seal blows.
|
| If the valve sticks closed, wouldn't the oil pressure
gauge be "pinned"
| high?
|
| Neil
|
|
|