This is cause for some concern. High oil pressure can burst the oil cooler,
the filter can, or a marginal field-fabricated hose. The risk depends on
what is causing it. Did you do a recent oil change, with new and
higher-viscosity oil? Did you put in single-grade 50-weight oil, in cold
weather? If so, you may need a regulator valve pressure adjustment. Some
valves are externally adjustable, while others require the addition or
removal of shim washers (or even a change to a spring having a different
pressure range).

The oil pump is a positive displacement pump; its output is directly
proportional to RPM, so it has to have a regulator valve. The valve is
nothing more than a large ball bearing held on its seat by a spring. If
something causes the spring to get gummed up or blocked, so the valve can't
open, it can cause high pressure. When that occurs, pressure will vary by
RPM; higher RPM, higher pressure.

If debris blocks the port to the oil gallery containing the regulator, oil
pressure will spike badly. Rick Koch lost an oil cooler to this, and is now
facing an engine tear-down due to internal contamination. His mechanic
suspects it is related to his remote oil filter set-up. You might want to
contact Rick and compare notes.

If the regulator is functioning properly, and there are no signs of debris
in the oil galleries, something like spun main bearings can cause high oil
pressure. But when that occurs they don't usually last very long; and the
PSI drop across the case (front to back), from all internal losses, is only
about 10 to 15 PSI; that can't cause a significant pressure spike.

You need to have some in-depth diagnostics done. It is unsafe to fly until
you know the reason for the high pressure. If it is related to internal oil
gallery contamination, you could have an engine failure due to oil
starvation in a critical area, at any time. Hopefully this will prove to
have some relatively benign cause, like an oil change or regulator valve
malfunction. Please keep me posted.

Oil temp senders, unlike the poor-quality gages, seldom go bad; most are
high-quality MilSpec parts. I assume you know for a fact that the sender is
bad?


_____

From: mediareps@aol.com [mailto:mediareps@aol.com]
Sent: Sunday, February 12, 2006 7:13 AM
To: mike@rellihan.com
Subject: Re: [musketeermail] Too much oil pressure?

That's why you get the big bucks... I did say cooler going home. What I
really witnessed was the oil PRESSURE going back into the green at 2300
rpm's. Orignally I was running 2550 and headed out over 30 miles of water to
Martha's Vineyard. Instead I stayed dry by a precautionary landing, got oil,
etc. Yes, TEMPERATURE gage has a bad sender. Being repaired at annual next
month.

Tom Corcoran

-----Original Message-----
From: Michael Rellihan <mike@rellihan.com>
To: n76lima@mindspring.com; musketeermail@yahoogroups.com; mediareps@aol.com
Sent: Sat, 11 Feb 2006 16:12:30 -0600
Subject: Re: [musketeermail] Too much oil pressure?

I'm confused. You refer to oil pressure and an unknown temperature. But
then
you mention that it ran cooler going home, after adding oil. Are we talking

about high oil temp, or high oil pressure? Rising temp usually results in
falling pressure.


---------- Original Message ----------------------------------
From: mediareps@aol.com <mailto:mediareps%40aol.com>
Date: Sat, 11 Feb 2006 13:35:20 -0500

<html><body>


<tt>
Had the oil pressure go over the top of the red today... 12 minutes after
T/O
at 3,000'msl, 2500rpms, oil temp unknown due to sender malfuctioning always
high. Landed. Oil on dipstick looked thin. Impossible to determine quantity
at
high temperature. I did not wait for cooling. Added two quarts to the 5qts
(I
think) already onboard. Ran cooler on the way back home at 2300rpms.<BR>
<BR>
Question: Can you have too much oil pressure?<BR>
<BR>
Tom Corcoran<BR>
<BR>
<BR>
<BR>
[Non-text portions of this message have been removed]<BR>
<BR>
</tt>


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