Oil pressure problem

You may also consider calling the American Bonanza Society if you're a
member. They have offered a lot of good advice in the past regarding my
Baron, and have a lot of knowledge and expertise.

"Aluckyguess" wrote in message
I have a Bonanza V35 with a IO 470. Before and after engine overhaul the
oil
pressure after the engine warms up goes just into the red. They have tried
turning the pressure up but this seems to only make the pressure go up
when
cold. If the temperature outside is real cool the pressure goes over 200
psi. The engine builder said its in spec. I think there is a problem
somewhere. I want the oil pressure to run in the green. Does anybody have
any ideas on what could be causing this.

Start first by checking calibration on your oil pressure guage.
Then check the bypass valve for proper operation (a good rebuilder will have
replaced it).
Ask the rebuilder to see his records for bearing/crankshaft clearance
measurements because the pressure is going out the gaps.

I'm afraid its going to blow the gage out one cold morning.

More likely to blow out an oil cooler.

D.

"Capt.Doug" wrote in message
...
"Aluckyguess" wrote in message
I have a Bonanza V35 with a IO 470. Before and after engine overhaul the
oil
pressure after the engine warms up goes just into the red. They have
tried
turning the pressure up but this seems to only make the pressure go up
when
cold. If the temperature outside is real cool the pressure goes over 200
psi. The engine builder said its in spec. I think there is a problem
somewhere. I want the oil pressure to run in the green. Does anybody have
any ideas on what could be causing this.

Start first by checking calibration on your oil pressure guage.
Gage was sent out for calibration and it was good.

Then check the bypass valve for proper operation (a good rebuilder will
have
replaced it).
I will ask about this.

Ask the rebuilder to see his records for bearing/crankshaft clearance
measurements because the pressure is going out the gaps.

I'm afraid its going to blow the gage out one cold morning.

More likely to blow out an oil cooler.

D.

"Aluckyguess" wrote in message
I'm afraid its going to blow the gage out one cold morning.

"Capt.Doug" wrote:
More likely to blow out an oil cooler.

That is PRECISELY what happened to mine. Oil cooler split on start-up,
unbeknownst to us. Dumped a fair amount of oil right there where we
started, trailed to the run-up area with another puddle there. Gauges
continued to read green/normal until 6 minutes into the flight when we
suddenly had zero oil pressure. Oil temp never went up, probably because
there was never enough oil in there to temp. Less than a minute after
the gauge dropped to zero, it began to buck and shake as the engine
seized, and less than a minute after that, we were down. Thank God we
were over the desert (less than a mile from the intended runway), but
the desert floor is NOT as flat as it looks from 100 or 50 feet. We are
grateful to have walked away with only bruises, but the airplane was
totaled.

I had never heard of an oil cooler failing before this, but since, some
people have said, "oh yeah, they fail sometimes." I also was never
taught to look behind me after taxiing away from start-up or run-up to
check for puddles of oil or fuel.

Shirl

On Wed, 03 Jan 2007 21:00:40 -0700, unicate wrote
in :

"Aluckyguess" wrote in message
I'm afraid its going to blow the gage out one cold morning.

"Capt.Doug" wrote:
More likely to blow out an oil cooler.

That is PRECISELY what happened to mine. Oil cooler split on start-up,
unbeknownst to us. Dumped a fair amount of oil right there where we
started, trailed to the run-up area with another puddle there. Gauges
continued to read green/normal until 6 minutes into the flight when we
suddenly had zero oil pressure. Oil temp never went up, probably because
there was never enough oil in there to temp. Less than a minute after
the gauge dropped to zero, it began to buck and shake as the engine
seized, and less than a minute after that, we were down. Thank God we
were over the desert (less than a mile from the intended runway), but
the desert floor is NOT as flat as it looks from 100 or 50 feet. We are
grateful to have walked away with only bruises, but the airplane was
totaled.

I had never heard of an oil cooler failing before this, but since, some
people have said, "oh yeah, they fail sometimes." I also was never
taught to look behind me after taxiing away from start-up or run-up to
check for puddles of oil or fuel.

Shirl

That's a lot of good information. Many thanks.

On Wed, 3 Jan 2007 14:13:28 -0800, "Aluckyguess" wrote:

I have a Bonanza V35 with a IO 470. Before and after engine overhaul the oil
pressure after the engine warms up goes just into the red. They have tried
turning the pressure up but this seems to only make the pressure go up when
cold. If the temperature outside is real cool the pressure goes over 200
psi. The engine builder said its in spec. I think there is a problem
somewhere. I want the oil pressure to run in the green. Does anybody have
any ideas on what could be causing this. I'm afraid its going to blow the
gage out one cold morning.
Thanks


When this was happening to my Lycoming IO360A1A, the problem turned out to
be a leaking nose bearing. Oil temperatures were also running high.

It was diagnosed by measuring differential pressures between the front and
rear of the case.
--ron

"Ron Rosenfeld" wrote in message
...
On Wed, 3 Jan 2007 14:13:28 -0800, "Aluckyguess" wrote:

I have a Bonanza V35 with a IO 470. Before and after engine overhaul the
oil
pressure after the engine warms up goes just into the red. They have tried
turning the pressure up but this seems to only make the pressure go up
when
cold. If the temperature outside is real cool the pressure goes over 200
psi. The engine builder said its in spec. I think there is a problem
somewhere. I want the oil pressure to run in the green. Does anybody have
any ideas on what could be causing this. I'm afraid its going to blow the
gage out one cold morning.
Thanks


When this was happening to my Lycoming IO360A1A, the problem turned out to
be a leaking nose bearing. Oil temperatures were also running high.

It was diagnosed by measuring differential pressures between the front and
rear of the case.
--ron
Was it leaking back into the engine or on to the ground.?

On Thu, 4 Jan 2007 23:10:53 -0800, "Aluckyguess" wrote:


"Ron Rosenfeld" wrote in message
.. .
On Wed, 3 Jan 2007 14:13:28 -0800, "Aluckyguess" wrote:

I have a Bonanza V35 with a IO 470. Before and after engine overhaul the
oil
pressure after the engine warms up goes just into the red. They have tried
turning the pressure up but this seems to only make the pressure go up
when
cold. If the temperature outside is real cool the pressure goes over 200
psi. The engine builder said its in spec. I think there is a problem
somewhere. I want the oil pressure to run in the green. Does anybody have
any ideas on what could be causing this. I'm afraid its going to blow the
gage out one cold morning.
Thanks


When this was happening to my Lycoming IO360A1A, the problem turned out to
be a leaking nose bearing. Oil temperatures were also running high.

It was diagnosed by measuring differential pressures between the front and
rear of the case.
--ron
Was it leaking back into the engine or on to the ground.?


There was no oil leaking to the ground.

But I'd be surprised if the problem, in your case, survived an overhaul. I
suppose it could've happened, but ...


--ron