OS 160FX Crankshaft Shear
08-22-2009, 09:44 PM
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OS 160FX Crankshaft Shear
Any ideas what would cause the craftshaft to break on a OS 160FX?
Today, just flying along and the prop started freewheeling. Pulled the engine apart and the crankshaft had sheared in that hollow area between the front and rear bearing. Is this a weak spot?
There were scrape marks on backplate. Not sure if they were recent, just from the fracture, or something that has been happening for a while. I do use a starter because my fuel tank is on the airplane CG with a perry pump, and it takes some spins to prime it.
Today, just flying along and the prop started freewheeling. Pulled the engine apart and the crankshaft had sheared in that hollow area between the front and rear bearing. Is this a weak spot?
There were scrape marks on backplate. Not sure if they were recent, just from the fracture, or something that has been happening for a while. I do use a starter because my fuel tank is on the airplane CG with a perry pump, and it takes some spins to prime it.
08-25-2009, 07:18 PM
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RE: OS 160FX Crankshaft Shear
Thanks for the response. I've not heard of anything regular.
I just want to be sure it is not something I am doing, since I am putting another 160FX on the plane. As noted, I do use a starter. Also, the engine is mounted inverted, but I do start it with the plane on a stand inverted (the engine is then upright) to preclude hydro-lock. I always hand-prop the engine a few turns before I hit it with the starter.
I just want to be sure it is not something I am doing, since I am putting another 160FX on the plane. As noted, I do use a starter. Also, the engine is mounted inverted, but I do start it with the plane on a stand inverted (the engine is then upright) to preclude hydro-lock. I always hand-prop the engine a few turns before I hit it with the starter.
