Are these zincs shot?

[Lowranger]

'89 Johnson 70. The one on the right has been wire brushed to remove the white powdery residue. The others are unbrushed. The middle one from above the trim tab shows little erosion or powder residue. Is it doing its job? Are they due for replacement? Also, The bolt threads were well protected by a silvery anti-seize compound that has worked for many years. Can anyone tell me what it is? I recall being warned about using an improper anti-seize(copper base ?).

 

[Laddies]

Re: Are these zincs shot?

They look fine to me and are still doing there job

 

[Dunaruna]

Re: Are these zincs shot?

Originally posted by Laddies:<br /> They look fine to me and are still doing there job

Ditto.

 

[angus63]

Re: Are these zincs shot?

Rule of thumb is to replace when they get to be less than 2/3's of their original size. Those have some good life left in them.

 

[rodbolt]

Re: Are these zincs shot?

they are over it.<br /> the calcium deposits will prohibit there efectiveness. while they are not eroded they are no longer sacrificial anodes. wire brusing kills them faster. never use wire on an anode, if you need to clean them, recommended before each launch, use 60 grit paper or a stone on a dremel.<br /> you can attepmt a test with them installed with a multimeter ., merc makes a tool to test them in the water. if they dont dissapear they may be the wrong materiel. usually a few wet and dry cycles without proper cleaning render them useless and they become another block of metal along for the ride. did you check the anode on the propshaft bearing carrier? you may consult your dealer for your local area to see if a diffent material anode is nessasary for your application.