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Old 18 November 2007, 12:08   #1
Country: France
Town: quimper
Boat name: kai 2
Make: capelli
Length: 5m +
Engine: yamaha 100
Join Date: Jul 2006
Posts: 105
Fogging Oil - how and when to use it?

I have a Yamaha F4A outboard that sits in a somewhat damp shed near the river when not in use.

It is not yet one year old.

It has been used sporadically over the summer and autumn, for a total of about 20 hours.

In November, it refused to start. Upon stripping the engine, it was found to have;

a) jammed throttle valve shaft (corrosion)
b) seized exhaust valve (corrosion)
c) dirty carb due to corrosion

I have now cleaned all these parts up, deseized them, changed the engine oil (no sign of water here) and the motor runs like a dream again. The corrosion was in fact relatively minor - quite easy to clean up, but enough to seize the parts in question solid.

So my question is, who uses fogging oil, and what technique do you employ, as clearly I need some for the future! I will henceforth keep this engine well away from the damp shed. Also, has anyone else experienced these kind of corrosion problems? I also have a Yamaha 60 and 100hp sitting in my garage, which is not really damp, but I am concerned about leaving them overwinter.

bernithebiker is offline   Reply With Quote
Old 18 November 2007, 12:37   #2
Country: UK - England
Town: Essex/Vendee
Boat name: shockwave,Voluntry 2
Make: Pac 22/ searider5.4
Length: 6m +
Engine: 180hp turbo,yam 90
Join Date: Nov 2004
Posts: 1,015
It really is worth greaseing the moving parts some use WD 40 but if you spray it on the loom it tends to make any insulating tape adhesive go all gooe _ee.Use grease on a small stiff brush on the linkage WD40 on the ally parts and outside and mounting brackets.WD40 does evaporate so i find this better as it tends not to pick up the dirt when you start to use it again

PeterR is offline   Reply With Quote
Old 18 November 2007, 12:43   #3
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Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,692
Buy a can-the type below has the instructions are on it (it's easier than me explaining it!)

Spray it on all the external moving parts too.

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