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Starter Adapter Bearing Corrosion

Has anyone else had issues with the bearing on the starter motor side of the adapter corroding? I just replaced this adapter on my IO-470N approximately 60 hrs ago, back in Aug 2022. The adapter that was replaced was corroded as well. Niagara air parts says this is common. Especially those living in cold country and high humidity (Wisconsin based.) I do not run a preheater often and airplane is always in a climate controlled hangar. If I do run preheat it’s only for 1-2 hours prior to the trip. No other signs of excessive moisture anywhere in the motor. My understanding is I should be getting some residual oil on the bearing. It is dry as can be. Niagara suggested packing the bearing with grease. I have a hard time wrapping my head around the fact that this is normal. Any other tips or suggestions? Thank you!

Model: Bonanza N35
Posted 6/13/2023 - 8 months ago
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The exposed bearing is not pressure fed with oil; it relies on 'splash'. They get ugly looking, no doubt about it. If a sealed bearing was used, you would have the same condition, just not see it, and there wouldn't be any oil migration to the starter to shaft interface. The seal from the starter to the adapter (thin o-ring) is not much more than a dust seal. On the positive side, reports are not flooding in of a failure of that bearing.


Mike
ABS Tech Advisor

Posted 6/13/2023 - 8 months ago
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Mike. Thank you for the insight!

Posted 6/16/2023 - 8 months ago
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Starter Adapter Bearing Corrosion