Key Bound Prop Adventures
Hi All - Its almost time to put the old girl back in the water, and this weekend I reinstalled the*newly pitched & tuned prop. Installing it, I first got some valve lapping compound, applied some to the shaft and*inside the hub,*and lapped the prop to the shaft without the key. I marked the most forward point of travel on the shaft, and removed the prop. I then installed the key(tight fit) and resinstalled the prop. As you can see, it did not advance to my line on the shaft. Even though this is just off by 1/8 inch, I removed the shaft again and*further dressed*the key with a light file - still a tight fit and still keybound! On the third fitting - success. good thing as that damn prop was getting heavy!
If the prop doesn't advance ALL the way to your marked line, the prop will be riding on the key, run eccentrically, and potentially damage the shaft and bearings and cost a ton of $$$ (lesson learned the hard way). Just thought I'd pass it along and maybe save someone some hard earned!