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View Full Version : NOTICE: Alert for Twinstarr and Lycoming 0-320-B2C owners

barnstorm2
03-05-2007, 08:53 AM
While this is likely an isolated failure I thought everyone should be notified.

While doing a cylinder change this weekend my friend Rick noticed that there was a CRACK in the alternator link adjusting bracket.

Upon further inspection we found that the crack went right through and the alternator adj bolt was holding the 2 pieces ON!

The part number for the part is still active and there is no AD's currently published on it.

the part number is: 74325

Some hangar chat on the issue brought up the possibility that the failure may be caused by renaissance generated by gyros or this particular craft.

PLEASE add checking the part to your pre-flight.



.
MikeBoyette
03-05-2007, 09:50 AM
Tim,
Glad ya caught that. Going through the prop and possibly up through the rotor would not be good.
WHY
03-05-2007, 09:54 AM
Hi Tim

Good post, don't know why but alternator adjustment brackets seem to be a problem point on a number of engines, they are also a problem sometimes on the various Subaru conversions, worthy of close inspection constantly.

Tony
Caribean_gyro
03-05-2007, 10:24 AM
tanks. In my config I put the alternator on the top right side and in the alternator position I have the gresen hydraulic pump.

CHuckP

I forgot to tell you my bracket is SS. attached is pic of it.
JEFF TIPTON
03-05-2007, 12:49 PM
Alternator adjustment brackets on Lycoming is not uncommon. When you install the new one make it is not in a bind. You may need to shim with washers to allow contact on both ends without pulling the bracket in.
Rando
03-05-2007, 01:02 PM
they are also a problem sometimes on the various Subaru conversions, worthy of close inspection constantly.TonyI agree! During a preflight of my EA81 with an Autoflite re-drive I noticed that my alternator assembly had almost vibrated off the engine!
Doug Riley
03-05-2007, 01:24 PM
...and a friend of mine had one break on a Suzuki-conversion trike... These brackets are strips of sheet metal stuck between two heavy objects. One heavy object (the engine) is vibrating like a dog shaking off water and the other one doesn't want to vibrate. That's a recipe for some serious pounding on the bracket.
Fl90
03-05-2007, 01:36 PM
...and power pulses from the drive belt.
Brent Drake
03-07-2007, 01:09 PM
I'll check mine. And keep it in my preflight. Thanks for the info Tim.