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I think that Brian and Dave are on to something with regard
to something being loose or the prop slapping around on the
shaft and fatiguing the pin.
Could it be something as simple as a loose prop?
Maybe the nut isn't tightened to the correct torque or it is
loosening up after a while due to natural vibration.
My last outboard was an old Merc and, as I recall, it had a
nut with a Nylon insert that secured the prop to the shaft.
There was a torque spec for putting it on too. I know that
such nuts need to be replaced frequently if they are taken
on an off --- I think that in critical applications they
should be replaced every time. Could be that the nylon
locking stuff is all chewed away.... But then maybe the
prop fastens on differently on these new fangled motors.
(probably uses a microcomputer instead)
Maybe there is a ding or bend in the shaft the keeps the
prop from going on all the way.
It might also be worth the time and effort to put in a new
pin and run the motor for a while and then take a look at
the pin before it breaks. There might be some clues like
little indentations in the pin etc.
Regards All
Rye Gewalt
Springfield VA
'90 HMS 19 (18?)
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I think that Brian and Dave are on to something with regard to something
being loose or the prop slapping around on the shaft and fatiguing the
pin.
Could it be something as simple as a loose prop?
Maybe the nut isn't tightened to the correct torque or it is loosening up after a while due to natural vibration.
My last outboard was an old Merc and, as I recall, it had a nut with a Nylon insert that secured the prop to the shaft. There was a torque spec for putting it on too. I know that such nuts need to be replaced frequently if they are taken on an off --- I think that in critical applications they should be replaced every time. Could be that the nylon locking stuff is all chewed away.... But then maybe the prop fastens on differently on these new fangled motors. (probably uses a microcomputer instead)
Maybe there is a ding or bend in the shaft the keeps the prop from going on all the way.
It might also be worth the time and effort to put in a new pin and run the motor for a while and then take a look at the pin before it breaks. There might be some clues like little indentations in the pin etc.
Regards All
Rye Gewalt
Springfield VA
'90 HMS 19 (18?)
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