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I have a nexus 30. About a month ago, when I landed and dropped the collective to idle, the rotor kept spinning fast. Shut it down and the the clutch drum was siezed to the motor. Got it home and when pulling apart, found the 3x6mm cap screw which holds the clutch shoe to the cooling fan had snapped. Had a little trouble, but got the screw piece out of the threads. Could see a little bevel to the sides of the screw hole in the fan but not any real damage to the threads. Got a new screw and put it back together. This past saturday when flying, the same thing happended again. Pulled it apart and found it was the same screw that snapped. This time, I couldn't get the old screw pieces out and had to go to a spare fan I had. When I was at the field, I had gunned the throttle a few times from idle as I am changing fuels and was testing engine response. I am wondering if this quick throttle action caused torque on the bolt and snapped it.
Is this a common problem for the nexus and how is it fixed? Whan putting locktite on the bolt threads and whan it breaks in the hole, there is just about no way to get it out. Too small for easyout and a drill bit walks and caused thread damage. I am tired of dealing with this problem. Thanks.
BTW, the fan that got stripped, I drilled and tapped the hole for 5mm, put a 5mm plug in it with JB weld, filed it smooth and am working on drilling out the plug and re-tapping for 3mm. Not sure if it will hold or not, but the plug is very hard metal and having trouble getting a hole thru it. I had another spare fan, but the back that goes up against the thrust washer was about 1/3" longer than the fan I took off, not sure why. I cut it down to match, but by the time I got it flat (cut at slight angle), it was not too short. Think it will be ok to place another washer between the thrust washer and fan to take up space? Would hate to knock the bearing out of the motor.