While doing the annual inspection on my Sonex aircraft, we discovered a service bulletin on the Aerovee engine. The bulletin tells owners to remove the alternator plate on the rear of the engine and replace the 4 socket head cap screws that retain the alternator stator with longer screws that have a nylon patch on them.
The bulletin also states that if the longer socket head cap screws bottom out in the blind hole before fully clamping the stator, the hole must be drilled through and tapped.
Well, guess what, the screws bottomed out. The whole operation was not hard, but taking the plate off the rear of the engine required taking a lot of things apart. And I had to buy 25 screws on-line, when I only needed 4.
This is the rear of the alternator adapter plate showing the 4 holes (with no red anodizing) that were drilled and tapped through to allow the new, longer screws to be installed from the other side.
The bulletin also states that if the longer socket head cap screws bottom out in the blind hole before fully clamping the stator, the hole must be drilled through and tapped.
Well, guess what, the screws bottomed out. The whole operation was not hard, but taking the plate off the rear of the engine required taking a lot of things apart. And I had to buy 25 screws on-line, when I only needed 4.
This is the rear of the alternator adapter plate showing the 4 holes (with no red anodizing) that were drilled and tapped through to allow the new, longer screws to be installed from the other side.
One of the 4 holes with the socket head cap screw.
This is the new, longer screw with the nylon patch to prevent the screw from backing out.
Stator installed with the new, longer screws.
No comments:
Post a Comment