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Old 03 August 2014, 09:04   #31
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I used the hose to flush backwards through the system for a good 10 mins, water comes out fine from the exhaust port on each side and from the intake on the underside of the cav plate, if it doesn't pump itself now I'll take the thermostat out and have a poke around !
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Old 03 August 2014, 09:25   #32
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A number of the twin cylinder, 2 stroke Mercury transportable outboards DO NOT HAVE a continuous flow of water, it starts and stops as cooling is needed. This includes the 8, 9.9 and 15hp engines with the destinctive triangular head.

We had a 1998 Mercury 8hp on my dads old sailing boat, tell tail ran 50% of the time depending on how hard it was working and the water/air temperature.

As far as I know, this these are the only engines with intermittent flow.
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Old 03 August 2014, 09:58   #33
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AAhhhh !!! Landlockedpirate, thanks very much for that, 2 other people had told me the same thing, and 6 others have said otherwise !

Since the water flows out when first started I've been under the impression the hoses etc are not blocked, so hopefully the thing is actually working as it should ! To be sure - How long can the motor be ran safely before switching off ? So that i can wait for water to pump out !
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Old 03 August 2014, 10:08   #34
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Just stick it in the test tank and run it till it stops, or pumps more water. In my experience, a 2 stroke siezing due to heat, isnt the end of the world. It will usually run again once it cools down.

But if its pumping at the start, it isnt blocked and remember most of the cooling goes through the leg, the water stream is only a tell tail and does little or no cooling itself.
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Old 04 August 2014, 01:15   #35
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When the engine is cold the thermostat will be closed. So if the tell tale works cold, when you first start it, then it doesn't turn on or off by the thermostat.

Mostly likely there is a free floating piece of debris that gets in the way occasionally. Have you tried pushing a wire or string trimmer line into the hole yet?
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Old 04 August 2014, 13:26   #36
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Quote:
Originally Posted by Landlockedpirate View Post
A number of the twin cylinder, 2 stroke Mercury transportable outboards DO NOT HAVE a continuous flow of water, it starts and stops as cooling is needed. This includes the 8, 9.9 and 15hp engines with the destinctive triangular head.

We had a 1998 Mercury 8hp on my dads old sailing boat, tell tail ran 50% of the time depending on how hard it was working and the water/air temperature.

As far as I know, this these are the only engines with intermittent flow.

Not heard of that, hey ho learn something new everyday....
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Old 04 August 2014, 13:49   #37
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Yes your model pumps when it needs, NOT a constant flow. It'll start to pump very hot, then stop as it cools.

To check the impeller is working, remove the stat (2 x 10mm bolts, however leave the rubber seal in place, or it will leak) and run it in a test tank. You'll get a strong, constant flow. Then test the stat, re-fit and run engine.

Some prefer a constant flow, so they remove the stat. You'll run into problems long term if you do this as its designed to run at the right temp, which gives best fuel, performance etc. Some refit a restrictor to slow the glow, giving a constant flow at the right temp.

This model never blocks on the tell-tale, as the outlet is huge!





Peter @ Boatsandoutboards4sale
07930 421007
www.BoatsandOutboards4Sale.co.uk
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Old 04 August 2014, 19:59   #38
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Thanks B&O; I'd never heard of that.

jky
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Old 05 August 2014, 01:12   #39
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Peter primed me with what to expect with my 15hp Mercury & was spot on.

Top man
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Old 05 August 2014, 06:59   #40
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I had a Mariner 25 that also had a thermostat on the tell tale so that water might not come out either because the engine was cold or bust... Stupid idea!

If in doubt, pull the cover off and keep an eye on the temperature of block by touching it carefully - or use infrared thermometer.

All the best

David
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