26 general marine shaft zinc

[rusty12]

I have a 26 gm and was wondering if I should have a zinc on the shaft. I only have 1 3/4 of shaft space between the end of the shaft key and cutlass. H and h stated that you need at least 3/16 for waterflow for the bearing....most collars at 1 1/2 which would leave me 3/16. Will I have an issue with cavitation with that setup or would i be better with a prop nut zinc?

 

[F/V First Team]

Put a shaft brush on it and call it good

 

[Eslang]

I have a 26 gm and was wondering if I should have a zinc on the shaft. I only have 1 3/4 of shaft space between the end of the shaft key and cutlass. H and h stated that you need at least 3/16 for waterflow for the bearing....most collars at 1 1/2 which would leave me 3/16. Will I have an issue with cavitation with that setup or would i be better with a prop nut zinc?

Yes it will cavitate. My friend has a 26 and we have to turn a zinc down on a lathe to make it work. If we put a standard zinc on it shakes so bad you would think the gear was bad.

 

[Raider Ronnie]

You could put a nut zinc also.

 

[TRUE NORTH]

Put a shaft brush on it and call it good

i agree here. simple and 1 less zinc you have to buy

 

[BillD]

Put a shaft brush on it and call it good

Running twin screws with exposed shafts, zinc attachment is NEVER an issue.

Help me out here..explain a "shaft brush" please???

 

[F/V First Team]

it is a copper strap with a conductor on the end that rides on the shaft. bend it so that it is just in contact with the shaft that way its not scoring the shaft. a bonding wire is hooked to the strap and grounded to the rest of the system. easy peasy. just mount it on a block somewhere down in the bilge out of the way.

 

[BillD]

it is a copper strap with a conductor on the end that rides on the shaft. bend it so that it is just in contact with the shaft that way its not scoring the shaft. a bonding wire is hooked to the strap and grounded to the rest of the system. easy peasy. just mount it on a block somewhere down in the bilge out of the way.

Thanks,
I had an inkling that it would be described as you did !!

 

[Capt. Rick]

Perhaps you might have room for a "collar" zinc on the shaft right behind the prop. BTY, if you guys are not familiar with www.boatzincs.com
check it out, great pricing and you can check out the zinc I am referring
to.

 

[rusty12]

Zinc

Collar will cause too much cavitation according to several gm owners.

Thanks for info guys