Prop Shaft grounding wiper

BillD

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A few weeks back a couple of members were asking about "shaft wipers" for grounding a prop shaft.

I remembered that Tony out @ Seaboard Marine uses the wiper in some repowers and new builds.

Here's a couple of pics of a prop shaft wiper.

Sunstart-Finished-Jan 13, 2012 (2).jpg

Sunstart-Finished-Jan 13, 2012 (19).jpg

Sunstart-Finished-Jan 13, 2012 (25).jpg
 

WoundUpMarine

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cb34

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Shaft grounding

Looked into this myself, and question if they are necessary. If the motor is grounded correctly and the motor is in contact with the shaft the shaft should be protected.
 

cb34

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ground

Please clarify, motor and gear case grounded. Shaft attached to gear case. How does tranny oil effect?
 

F/V First Team

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Unless you've grounded out the coupling, hard to do because once it starts to spin it's going to tear the cable out and really mess things up, then there is a film of oil separating the shaft from the case itself. The bearings and such that support the inner workings are in an oil bath so that the metal surfaces aren't touching each other. Without this oil things wouldn't spin so smoothly...
 

samhop

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so assume that the brush arm or the alum gear mounting bracket is tied to the grounding system because most soft mounts will eclectically isolate whatever is mounted with them.
 


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