White residue on outboard starboard side hose.

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  White residue on outboard starboard side hose.

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Author Topic:   White residue on outboard starboard side hose.

rkong posted 06-03-2014 07:35 PM ET (US)
Hi--I have a 2007 Mercury 115 Four-Stroke. I took a look under the cowling today and noticed some white powder-like residue covering a hose (Thermostat Dump Hose?) that runs vertically on the starboard side of the motor. I was wondering what this could be and is it an issue? Any help is much appreciated. Pictures attached in the link. Thanks.
https://www.flickr.com/photos/125219672@N04/14340235004/in/photostream/
saumon posted 06-04-2014 07:54 AM ET (US)
If you boat in saltwater, it could be salt deposit if the hose is dripping at the top fitting.
rkong posted 06-04-2014 03:31 PM ET (US)
I was thinking that it was a salt deposit too, but did not see any signs of a leak at the top. And it doesn't go all the way to the top, only to where you can clearly see the bulge from the fitting inside. Is it possible for the salt to permeate through the rubber?
I noticed a couple interesting things about the powder. It is only on the hose itself. None is on the two clamps at the top and bottom holding the hose on, or the twist ties in the middle clamping on other cables. Meaning they powder was there before the clamps, twist ties or it came from through the inside of the hose rather then dripping onto it.
There is also two painted lines on the clamps/hose to show if they have been moved. Again the powder is not clearly on top of the painted line, so it seems like the powder was there originally or came from inside the hose.
Ridge Runner posted 06-04-2014 08:06 PM ET (US)
Often rubber products are dusted with mold release agent - a zinc stearate white powder to prevent them from sticking. it looks like it may have never been cleaned off and has been baked on over the years.
padrefigure posted 06-12-2014 10:08 AM ET (US)
could also be a pin hole in the hose. No leak would be apparent at rest, but when under power, heat/steam could push some moisture out. Salt or hard water minerals would be left behind when the water evaporated. Maybe replace the hose and see if it goes away. The mineral deposits are very corrosive.

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Author	Topic: White residue on outboard starboard side hose.
rkong	posted 06-03-2014 07:35 PM ET (US) Hi--I have a 2007 Mercury 115 Four-Stroke. I took a look under the cowling today and noticed some white powder-like residue covering a hose (Thermostat Dump Hose?) that runs vertically on the starboard side of the motor. I was wondering what this could be and is it an issue? Any help is much appreciated. Pictures attached in the link. Thanks. https://www.flickr.com/photos/125219672@N04/14340235004/in/photostream/
saumon	posted 06-04-2014 07:54 AM ET (US) If you boat in saltwater, it could be salt deposit if the hose is dripping at the top fitting.
rkong	posted 06-04-2014 03:31 PM ET (US) I was thinking that it was a salt deposit too, but did not see any signs of a leak at the top. And it doesn't go all the way to the top, only to where you can clearly see the bulge from the fitting inside. Is it possible for the salt to permeate through the rubber? I noticed a couple interesting things about the powder. It is only on the hose itself. None is on the two clamps at the top and bottom holding the hose on, or the twist ties in the middle clamping on other cables. Meaning they powder was there before the clamps, twist ties or it came from through the inside of the hose rather then dripping onto it. There is also two painted lines on the clamps/hose to show if they have been moved. Again the powder is not clearly on top of the painted line, so it seems like the powder was there originally or came from inside the hose.
Ridge Runner	posted 06-04-2014 08:06 PM ET (US) Often rubber products are dusted with mold release agent - a zinc stearate white powder to prevent them from sticking. it looks like it may have never been cleaned off and has been baked on over the years.
padrefigure	posted 06-12-2014 10:08 AM ET (US) could also be a pin hole in the hose. No leak would be apparent at rest, but when under power, heat/steam could push some moisture out. Salt or hard water minerals would be left behind when the water evaporated. Maybe replace the hose and see if it goes away. The mineral deposits are very corrosive.