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Old 30 January 2010, 13:44   #1
zookeeper's Avatar
Country: UK - England
Town: Greatstone
Boat name: timanfaya 2
Make: zodiac
Length: 5m +
Engine: mariner 75
MMSI: 235079206
Join Date: Jul 2009
Posts: 119
limescale on out board

have mariner engine which has been used by water authority in fresh water, but the leg is covered in" limescale" any suggestions on how best to remove this?

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Old 30 January 2010, 13:50   #2
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
Join Date: Dec 2006
Posts: 4,014
Killrock Gel ?

Certainly works on my taps

Chris Stevens

Born fiddler
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Old 30 January 2010, 14:06   #3
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Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
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Posts: 10,226
If its genuinely limescale then any acidic solution will remove it - the trick will be making sure that the metalwork on the engine isn't damaged at the same time. Are you sure it is limescale not some sort of horrible corrosion of the aluminium leg. If you are looking to dunk the leg in something (rather than carefully apply only to areas which won't be damaged) then something relatively gentle like citric acid (from pharmacists?) should be less harmful to any sensive bits.

If it is limescale on the outside of leg, I would be very concerned about the state of the interior of the engine cooling passages.
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Old 01 February 2010, 11:26   #4
Country: USA
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White vinegar on a sponge, followed by a fresh water rinse. Should take care of it.

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