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Old 02 July 2004, 05:36   #1
Country: UK - England
Town: Thurrock Essex
Boat name: rib
Make: zodiac
Length: 5m +
Engine: mercury 50
Join Date: Jun 2004
Posts: 18

Hi all
I have a Mercury 50 attached to my rib, I think its circa 1990. I'm getting the rib ready to spend the rest of the season on a salt water swinging mooring.
Could you tell me please where the anodes fit on the engine?
I've had a look over the outboard and can't seem to find any obvious manufactured positions to bolt an anode to.
I have had only drive legs in the past, this is all new to me.
Cheers for now.


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Old 02 July 2004, 05:44   #2
Pete7's Avatar
Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,837
Andy most outboards come with two. One is the trim tab (small fin) on the back of the engine behind the prop and the other is at the very bottom of the engine saddle which holds the engine to the boats transom. This one can be a real sod to change as the bolts corrode, but the one behind the prop is quite straight forward.

Do a search for MG Duff, they make pattern Anodes and might be a lot cheaper than Mercury.


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Old 02 July 2004, 14:07   #3
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,332
If you can find the engines serial number i can give you the part numbers for the Anodes if you like.
Turbodiesel is offline   Reply With Quote
Old 02 July 2004, 16:04   #4
Country: UK - England
Town: Great Harwood, Lancs
Boat name: Tigger II
Make: Bombardier Aerodeck
Length: 3m +
Engine: Tohatsu 25HP
Join Date: Jul 2001
Posts: 626
Hi folks

If you raise the outboard clear of the water anodes are not as big an issue.
Saying this often the power trim ram and bottom of the mount often are still below the water line.

The biggest issue assuming you can raise the leg clear of the water is the internal anodes.

Flushing with freah water and draining is not usually an option for a swinging mooring, so the engine will be left full of salt water. The internal anodes protect the engine from corrosion but are very often overlooked.
Even when left the corrosion damage is not visible till its too late.

Check for internal anodes and keep then in good condition.

Regards Gary
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