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Michaels Web Site
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Date: 6-30-2014
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Number of Hours: 0.00
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Manual Reference:
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Brief Description: Engine click solved!
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I did the service bulletin for the new screws, but that was not the source of the clicking. My screws were indeed the shorter ones, but they were firmly seated and set with Loctite.
The clicking was caused by TWO things: movement of the stator ring, and movement of the alternator mount plate (that the stator ring is attached to).
Stator Ring (see photo attached): this ring is attached with 4 screws during assembly. I only found the ring was loose by grabbing the mount plate and the ring, and twisting. The ring moved. Not a lot, but it moved. I never would have found it if I hadn't decided to do that twist. When I started backing out the screws, they were easy to back out. Not overtly loose, but easy to start moving with a hex wrench. When I got the screws out, they had a lot of black gunk on the screw threads (no idea what it was), and a definite blob of Loctite near the end of all the screws. I had to work to get the old Loctite off. I cleaned the screw threads and secured them again with Loctite, but this time I used the Loctite primer (see photo) that I got to secure the screws in the service bulletin.
Alternator Mount Plate: I put the stator assembly back in place and put 2 screws loosely in place, figuring that would hold the plate while I turned the prop. The click was still there. It was much less, but still there. Rats. But in moving the prop back and forth and listening for the click, I finally realized it was the alternator mount plate that was moving ever so slightly. There is some play between the side of the screw holes, and the screws. The powerful magnets attract the points around the stator ring, building up kinetic energy as the prop/magnets are rotated. Once the prop was rotated a few degrees the stator ring finally pulled away from the magnetic field and then banged against the side of the screws, making the click. I tried tightening down 2 screws temporarily, very tight. No more click! So I cleaned the 6 screws and installed them with the primer and Loctite, and tightened them down. N
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Brown is the stator ring, red is the alternator mount plate.
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LocTite primer
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