Oil pressure problem

[Aluckyguess]

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

[Larry Dighera]

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

>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
>

What is the oil pressure indication before it warms up?

I'm a little confused by why the pressure should be adjusted upwards
when it appears that your complaint is about it being too high, but
here are some ideas:

1. If it behaved that way before AND after the overhaul, the
source of problem may be in the metering circuit/piping (gage).

2. If the engine oil pressure is indeed too high, it may be the
result of an obstruction in the oil passages (sludge, foreign
object(s), that went unnoticed during rebuild.

Can you quantify the temperatures and pressures?

Have you considered contacting Lycoming/Continental?

[Newps]

Aluckyguess wrote:

> I have a Bonanza V35 with a IO 470.

So you have an N35 or P35, a V35 has an IO520.


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.

How do you know the gauge is correct? Check that first.

[Aluckyguess]

"Larry Dighera" > wrote in message
...
> On Wed, 3 Jan 2007 14:13:28 -0800, "Aluckyguess" > wrote in
> >:
>
>>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
>>
>
> What is the oil pressure indication before it warms up?
>
> I'm a little confused by why the pressure should be adjusted upwards
> when it appears that your complaint is about it being too high, but
> here are some ideas:
>
> 1. If it behaved that way before AND after the overhaul, the
> source of problem may be in the metering circuit/piping (gage).
>
> 2. If the engine oil pressure is indeed too high, it may be the
> result of an obstruction in the oil passages (sludge, foreign
> object(s), that went unnoticed during rebuild.
>
> Can you quantify the temperatures and pressures?
>
> Have you considered contacting Lycoming/Continental?
>
The pressure is to high when the engine is first started then when warm its
to low.
No I have not contatcted Lycoming but I will try.

[Aluckyguess]

"Newps" > wrote in message
. ..
>
>
> Aluckyguess wrote:
>
>> I have a Bonanza V35 with a IO 470.
>
> So you have an N35 or P35, a V35 has an IO520.
>
>
Its an N model

> 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.
>
> How do you know the gauge is correct? Check that first.
>
>

[[email protected]]

>
> > 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.

Sounds like the relief valve is sticking. That'll cause low oil
pressure when hot and high when cold.

Dan

[Kyle Boatright]

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

We need more details. In particular, is the oil pressure low at cruise RPM,
or just at idle RPM? How hot is the oil when you see these readings? The
spec's for my engine allow the oil pressure to fall to the very bottom of
the yellow arc, possibly into the red if the oil is hot and RPM are low.

Turning the pressure relief valve up or down only sets the maximum possible
pressure. It doesn't help boost pressure when the oil is hot. If you've got
it too tight, you may indeed get 200 PSI on start-up, but that won't do you
a bit of good once the oil gets warm. Once the oil is warm, pressure is
dictated by how "loose" your engine is. Turn the pressure relief valve back
to where it limits pressure on start-up to what the book recommends. You'll
be sorry if you don't - you'll damage something, possibly a filter, possibly
something internal to the engine.

KB

[Larry Dighera]

On Wed, 3 Jan 2007 16:03:33 -0800, "Aluckyguess" > wrote in
>:

>The pressure is to high when the engine is first started then when warm its
>to low.

Now I understand. How cold is it when you start? Perhaps you need an
engine heater in the winter. Where are you located. Is the aircraft
hangared?

You said it did this to high when cold and too low when warm syndrome
before the overhaul too?

What grade of break-in oil are you using?

>No I have not contatcted Lycoming but I will try.

There's a trouble shooting guide here:
http://www.lycoming.textron.com/main.jsp?bodyPage=/support/index.html

[Viperdoc[_4_]]

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.

[Capt.Doug]

>"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.

[Aluckyguess]

"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]

I am in Southern Ca. Engine now has over 200 hours and burns no oil.
"Larry Dighera" > wrote in message
...
> On Wed, 3 Jan 2007 16:03:33 -0800, "Aluckyguess" > wrote in
> >:
>
>>The pressure is to high when the engine is first started then when warm
>>its
>>to low.
>
> Now I understand. How cold is it when you start? Perhaps you need an
> engine heater in the winter. Where are you located. Is the aircraft
> hangared?
>
> You said it did this to high when cold and too low when warm syndrome
> before the overhaul too?
>
> What grade of break-in oil are you using?
>
>>No I have not contatcted Lycoming but I will try.
>
> There's a trouble shooting guide here:
> http://www.lycoming.textron.com/main.jsp?bodyPage=/support/index.html

[Aluckyguess]

> wrote in message
ps.com...
>
>
>>
>> > 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.
>
> Sounds like the relief valve is sticking. That'll cause low oil
> pressure when hot and high when cold.
>
> Dan
>
I will ask the mechanic about this. I know they have replaced the oil pump
and a few other things before I bought it.

[[email protected]]

"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

[Larry Dighera]

On Wed, 03 Jan 2007 21:00:40 -0700, 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.

[Ron Rosenfeld]

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

[Aluckyguess]

"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.?

[Ron Rosenfeld]

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