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Marc W

Well-Known Member
Joined
Mar 31, 2017
Messages
534
Location
Colorado
I made a short flight this morning - shortest on record for me! I took off and settled into the climb. Glanced down at the panel and saw the oil pressure was low and dropping. The needle hit "0". The engine was running fine and I didn't hear any wheezing or clanking so I left it running. I made a 180 to head back to the runway and called an emergency.

"Impossible turn" my sweet patootie! I was barely past the end of the runway and it being a cool morning I was probably at close to 1000' AGL. The engine was still running fine but I didn't want to tempt fate so I pulled it to idle and headed down. I was still at 100 MPH at the threshold but the runway is over a mile long so I went ahead and floated down most of it before I felt slow enough to set down. I still landed fast but I thought I could slow better with the wheels and brakes on the ground. As it happened I had enough runway to not need the brakes but I did use the whole runway.

The engine ran fine the whole time. I thought about shutting it off to increase drag but I decided to let it idle in case I needed it. I taxied back to the hanger and shut it off. Then I noticed the alternator circuit breaker was popped. I reset the breaker and fired it up. Oil pressure came up and the breaker stayed in. The only thing wrong is the alternator voltage read about 12 volts and it should be between 14 and 15V.

The new prop hub seals I put in are still leaking bad. Brand new seals shouldn't leak. The crank seal on the flywheel end has always leaked. I just have a bad feeling about this engine. I hear it talking to me. I feel like it is a ticking time bomb. I think it is time to bite the bullet and tear it down before it kills me, maims me or at least puts me on foot. So that's it. I am done flying until I get the engine checked out.
 

TFF

Well-Known Member
Joined
Apr 28, 2010
Messages
13,650
Location
Memphis, TN
Good job on paying attention.

Smart to fix it.

Sounds like you might have lost the alternator
 

Pops

Well-Known Member
HBA Supporter
Log Member
Joined
Jan 1, 2013
Messages
8,386
Location
USA.
If you have positive pressure inside the case, it will leak. Make sure your case vent is vented at a negative pressure location.
 

Marc W

Well-Known Member
Joined
Mar 31, 2017
Messages
534
Location
Colorado
Does the prop hub have any runout?
The seals had worn into one side of the hub more deeply than the other. I didn't measure it but it looks like something is not concentric. There has been a little voice in my head telling me I need to tear it down for some time now. I am going to tear it down because my guardian angel is about done protecting me from myself.

The correct angle of the impossible turn is 45°.
I did make a steep turn. It had to be close to 45°.

I suspect the voltage regulator went bad. I didn't smell anything so I think it is internal.

I had started to make a fitting to attach the breather hose to the airbox. That is on hold now.
 
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