Anode

N

noah4009

Petty Officer 1st Class
Joined
Nov 6, 2008
Messages
283
I am doing a couple of things to my Chrysler 55hp, 1971. One is change the LU gasket. I keep reading on these forums something about an anode. What, where is this, and what is its purpose?
Thanks
 
mthieme

mthieme

Captain
Joined
Oct 6, 2007
Messages
3,270
Re: Anode

Typically, the anode is a small skeg bolted to the bottom of the cavitation plate just above and behind the propeller. It's job is to repel galvanic corrosion.
Having said that, It's been a long time since I've seen a Chrysler, so I'm not sure about your specific application. There are other crew memebers with Chrysler who will jump in and verify.
 
Frank Acampora

Frank Acampora

Supreme Mariner
Joined
Jan 19, 2007
Messages
12,004
Re: Anode

The anode is a piece of zinc cast in whatever shape wanted. It is more electrically active than the engine aluminum and so preferentially corrodes, saving the engine.---maybe.

The 55 did not have a factory installed anode. They were only on the larger one piece lower unit engines behind the prop.

If you wanted, You could add a small flat zinc on the ventilation plate. Just be certain it has good contact with bare metal for protection--otherwise it is useless.
 
mrwiggles2

mrwiggles2

Seaman
Joined
Aug 26, 2008
Messages
70
Re: Anode

Frank Acampora said:
The anode is a piece of zinc cast in whatever shape wanted. It is more electrically active than the engine aluminum and so preferentially corrodes, saving the engine.---maybe.

The 55 did not have a factory installed anode. They were only on the larger one piece lower unit engines behind the prop.

If you wanted, You could add a small flat zinc on the ventilation plate. Just be certain it has good contact with bare metal for protection--otherwise it is useless.
Click to expand...

Frank, did the 70hp models have one? Just thinking after I completed the seal and pump kits, I never saw anything that I took to be an anode.
 
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