Originally Posted by BigCat
I think prop shafts should not only have key ways and keys, but a cotter pin or bolt right through the shaft and coupling, and not just set screws-I don't know what his arrangement was on the tri.
Holes drilled thru prop shafts are not wise! It weakens the shaft leaving it subject to a twist fracture. Shafts are designed in for a certain strength, drilling a hole thru would compromise that.
See picture below. The couple should have two square head
set screws (factory hardened w/ holes in the head) opposite of each other with a safety
wire keeping them from backing out if they ever come loose. And should be periodically inspected as well as other parts
of the machinery!
Before the installation
of the SS's a drill should be put down thru the threaded holes and dimples drilled into the shaft just deep enough for the SS tip to sink below the surface. This does two things;
1) the coupler can be removed without having to beat/pry it off over the dimples left by SS's.
2) Even if the SS's become loose but stopped by the safety
wire, the couple will not come off. Although, it would leave dimples in the shaft making the coupler hard to remove. BUT, better then loosing a shaft.
Now back on anchoring