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Author Topic:   Where's the Anode?
minimontauk posted 01-09-2003 08:05 PM ET (US)   Profile for minimontauk   Send Email to minimontauk  
I have a 1996 Johnson 48 HP with electric tilt. I don't see an anode anywhere on the motor or bracket. It was previously trailered after every use by the former owner. I am going to be mooring in salt water. The trim tab looks like painted aluminum. Anyone know where the anode is supposed to go on these engines?
jstachowiak posted 01-10-2003 09:36 PM ET (US)     Profile for jstachowiak  Send Email to jstachowiak     
My 1992 40HP Johnson's sacraficial anode was the "trim tab" piece right behind the prop, the thingy you can adjust from side to side. My 2001 Evinzuki is right under the mount that mounts on the transom.
aubv posted 01-11-2003 10:00 PM ET (US)     Profile for aubv  Send Email to aubv     

Both my '95 130 HP and '96 9.9hp Evinrude engines (OMC) have an anode located above the cavitation plate, in line with the front of the prop. They are square in shape and sit inside the lower unit housing so the outside edge of the anode is flush with the sides of the lower unit. I can send you pictures of both engines if it will help.

Tom W Clark posted 01-12-2003 01:03 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     

I do not know about your 1996 Johnson 48, but my 1990 Johnson 150 had four anodes, one above the cavitation plate as Brian describes above, one in the gearcase hub in front of the propeller, one mounted on the leading edge of the bottom of the mid section and one screwed to the bottom of the mounting bracket next to the transom.

My Johnson 9.9 has one screwed through the cavitation plate itself with a pair of #10 cap screws. This type of anode could be retrofitted to any outboard.

I have never seen an OMC motor with the trim tab as the anode. This was a Mercury detail that I always thought was rather poor; as the zinc is eaten away so is the trim tab's performance. I wonder if jstachowiak's trim tab is aftermarket?

Sal DiMercurio posted 01-12-2003 02:37 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
The main anode should be just above the antivent [ cavitation ] plate, counter sunk into the led.
If you look under the antivent plate,[ near the back end of it ] you will see a bolt that gos up, it holds the zinc in place, another should be right at the bottom of the mounting bracket.
minimontauk posted 01-14-2003 09:18 PM ET (US)     Profile for minimontauk  Send Email to minimontauk     
I found out where an anode is supposed to be, on the forward side of the lower end, sort of directly opposite the propeller is a horizontal fin with two bolt holes for the "optional anode". NOT optional, since I'll be in salt water. They go for something like $25.00. Do these have to be replaced every year? Ouch!

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