Generator Bolt corrosion with universal mount block

[Steven Brewer]

I own a 1966 Twinco and had a generator bolt shear due to corrosion. The left one is from the good engine (not sure if it is also corroded) and the right one is the failed bolt. It sheared twice, the second time is caused damage to my spinner and mounts due to vibration. (the hole in the middle of the corroded sections was how I extracted it from the universal mounting block).

IF you use a universal mounting block (brass with multiple holes) to mount the generator, use caution that the threads are exposed to one of the holes and water can corrode the bolt, causing failure, vibrations and potential spinner failure.

Anyone else have this kind of issue?

Steve

[N3322G]

Steve,

Sorry to see this problem. I can only tell you it hasn't happened on my twin and I don't recall seeing it posted in the past. My twin's engines have alternators and it did have an ear break off but that was due entirely to mechanic's induced vibration (long story but he's no longer in business). The lord mounts were not tightened to spec.

I'll be interested to hear what other folks have experienced.