Coupers, Does anyone happen to know what the thickness of the rubber is between the
engine mount bolts and the engine crankcase (C90-16F) at the center of the engine mount rubbers? I seem to remember that there is only about 1/8 inch of rubber (inside diameter to outside diameter) at the narrow end of the shock mount pieces (?). The reason that I ask is that I just had my Alon annualed, and it looks like the engine is sagging about 1/8 to 1/4 inch at the mounts. I have new rubber mounts on order, but I'm wondering how much the engine can sag before there's metal to metal contact between the bolts and the crankcase. Maybe I've found the source of the vibration in the plane. I hope!! Thanks, Wayne DelRossi Alon N5618F Simpsonville SC
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