O 200 Crankshaft Rust

[Firefly]

A&P says (In connection with a Continental O200 top overhaul) the crankshaft has too much rust between engine housing and propeller (outside engine).

I'm thinking the crankshaft diameter reduction and strength reduction from rust is less than 1% and irregular distributed over the length and diameter.

The design strength of the crankshaft has likely a 50 % safety factor. So there should be no problem.

Here are the photos:

http://hc-research.com/Continental.html

What do you think?

[Eric Brown]

Well ..... Continental service bulletin SB09-14 addresses this subject. Go to Continental Aerospace Technologies, support, service bulletins to read a copy.

[Firefly]

Thanks Eric, I have seen the service bulletin.
But I am unhappy taking out engine and crankshaft because the 50% safety factor is now a 49% safety factor.

[JustJoe]

Thanks Eric, I have seen the service bulletin.
But I am unhappy taking out engine and crankshaft because the 50% safety factor is now a 49% safety factor.

Where did you come up with the 49% number?
I don't know how you figured that.
You asked what do others think.
I think you've got a area corrosion that circumferences the crank shaft and is a excellent point for cracks to begin. I'm guessing you've got the issue cleared up by now.
Care to share how it was handled?

[JustJoe]

A&P says (In connection with a Continental O200 top overhaul) the crankshaft has too much rust between engine housing and propeller (outside engine).

I'm thinking the crankshaft diameter reduction and strength reduction from rust is less than 1% and irregular distributed over the length and diameter.

The design strength of the crankshaft has likely a 50 % safety factor. So there should be no problem.

Here are the photos:

http://hc-research.com/Continental.html

What do you think?

After reading the Service Bulletin, and judging by your pictures, I am in agreement with you A&P. Repair or replacement is in order.