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Old 05 January 2015, 16:47   #31
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As said above plenty engines never see a flush & keep running.

I got round the problem of flushing in a housing estate by using a "J- cloth" (Other dishwashing flannels are available!)

- Take the cloth - stuff it up the inside of the prop.
- Take a square (or any offcut of sheet wood you have lying about, as long as it's bigger than the hub & not woosy thin) then a length of bungee round the front of the gearbox to hold it in place. (make sure the wood isn't touching the hub or it gets REALLY noisy! )

- switch on & flush, remembering of course not to engage gear!

Granted I do it in the first available afternoon, as I'm usually so gubbed by the time I get home flushing is about as far from the sofa & a malt than it could get, but the cloth (use 2 for a big prop) does muffle the noise to the point of similar to in the water.

I'm probably also helped by the Harley owning guy a few doors down who shares his exhaust nose with the whole town!
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Old 09 January 2015, 03:16   #32
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Not sure what sort of motor you are using but the E-TEC has a fitting on the back that simply accepts one of the standard screw-in garden hose fittings, so I made up a flushing attachment with a foot of hose and a Hozelock connector for less than a fiver (I'm sure Evinrude will also sell one for much more) and I never run when flushing.

Likewise the Merc 4hp aux - it has a screw in fitting that I got with the engine, again it's attached to a foot of hose and a standard Hozelock type fitting so I just plug it in to the end of the garden hose. I guess you can do the same with most engines.
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Old 09 January 2015, 10:06   #33
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My engines have a hose attachment and don't need to run to be flushed.
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Old 09 January 2015, 11:51   #34
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Our 150hp Mariner Optimax has 863 hours and has probably been flushed 2 or 3 times over the past 10 years. Never had an issue. However, it is regularly serviced and the thermostats are replaced quite often. The engine is also used at least once a fortnight and this probably helps.
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Old 09 January 2015, 13:03   #35
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Just had a problem with my tell tail pressure not as powerful as it should be problem,salt cristals in the out let plug at the very end.engine has only done 160hours and is flushed for 20 min with the engine running every time giving time for the thermostat to open and flush through, impeller changed each year as part of the service.i am thinking of flushing through with salt away at the end of each season.was told by a guy on the Isle of man who supplied an engine for me to put veg oil through whilst flushing stops the salt sticking?
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Old 10 January 2015, 04:11   #36
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Veg oil? Sounds half baked to me.
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Old 10 January 2015, 10:23   #37
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Originally Posted by Nos4r2 View Post
Veg oil? Sounds half baked to me.
I did hear of one customer who used to run engine oil through the cooling system of his seawater cooled single cylinder Volvo when laying up. I imagine it made a mess when he started it in the spring though!
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Old 10 January 2015, 12:09   #38
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I heard from a customer of mine who works at a Honda marine dealer that they run vinegar through from the thermostat housing and that reacts with the salt and cleans it out, they then flush it through with fresh water, refit the thermostat and flush all the engine through. Seems to work well and isn't aggressive to the softer metals.

Interesting jeff I had a similar problem with my df140 last summer in Scotland, typical fine all week then off on a planned trip to Iona and hardly any tell tale, this was in the marina, went back to the pontoon, messed around and then found the same as you, cleared the nozzle and all was fine again.

Will definitely have my thermostat out this year and give it a flush through.
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Old 10 January 2015, 12:34   #39
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Vinegar will disolve the salt for sure. Or if you can I suppose hot water,
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Old 10 January 2015, 13:38   #40
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Vinegar will disolve the salt for sure. Or if you can I suppose hot water,
That depends what the salt is. What we all think of as salt (sodium chloride) and which is the bit that makes sea water saline, is no more soluble in vinegar than plain water. it is more soluble in hot water than cold. It will also dissolve in sea water (it is not saturated) and so long as you don't block the flow it should clean itself out, especially as the water warms up.

What we generally call scale (but chemists would still call a Salt) is calcium carbonate which reacts with vinegar (and other acids). BUT is less soluble in warm water (which is why, in hard water areas your kettle furs up).

So if it dissolves easily in vinegar hot water will not help, and in hard water areas could make it worse.
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