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Old 06 January 2013, 14:33   #1
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Mercury 9.8 water temp

Hi, should the water that discharges through the top of the block always be cold, mine comes out at a hell of a rate of knotts will this not stop the engine reaching operating temp.

So I guess I should ask is it ok to reduce the flow from the water discharge so that it at least feels warm, it has not got the facility for a thermostat.

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Old 07 January 2013, 02:39   #2
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Are you talking about the tell-tale? If so, it's just that - something to show that the impeller is working.

Personally, if there's no problem with how the motor runs, I'd want the cooling water cooler rather than warmer.

jky
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Old 07 January 2013, 04:37   #3
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Quote:
Originally Posted by jyasaki View Post
Are you talking about the tell-tale? If so, it's just that - something to show that the impeller is working.

Personally, if there's no problem with how the motor runs, I'd want the cooling water cooler rather than warmer.

jky
Hi jky,
yes the tell-tale sorry, the reason I ask is that I have read (I think on this forum) that it should be warm > hot to touch, and I was just wondering if perhaps there should be some sort of restrictor on the pipe to slow the rate of discharge allowing the engine to run warmer.

Thanks for your reply
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Old 08 January 2013, 08:52   #4
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If there's a hole at back middle leg you will feel water temp changing when thermostat opens, closes varying engine temp at idle & non idle speeds. Tell tale is just a visual water port that tells if pump is working, if you have clogged water intakes and to check impeller condition, that is if delivering low or high water tell tale output so to be aware it's time for a water pump change.

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Old 08 January 2013, 09:10   #5
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Hi Loco,
my outboard does not have a thermostat fitted or indeed a facility for a thermostat, that is why I was wondering how the engine could ever reach operating temp with cold water constantly "wizzing" through.

I just thought that by reducing the flow through the tell-tale I could perhaps allow the engine to run a little warmer as it does discharge alot of water through it, but on reflection maybe not as I could not regulate the discharge through the leg.

Looks like I will have to just accept it, as it was probably designed to be like that.

Thanks for your input
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Old 09 January 2013, 11:40   #6
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Asummed it was a rebadged 9.8 Tohatsu which has a interior thermostat, tell tale it's still a water peeing pump indicator, don't reduce it's diameter. Those type of engines has reduced internal water paths to maintain it's working temperature, just flush engine with fresh water after each use to avoid salt formations inside water paths.

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Old 09 January 2013, 14:14   #7
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Thanks again Loco
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Old 10 January 2013, 08:11   #8
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Both 9.8 2 & 4 strokes models do have thermostats. On 2 strokes the thermostat is invisible hidden between crankcase and cylinder head, on 4 strokes is attached onto side exhaust cover by means of a round cap.

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Old 10 January 2013, 08:22   #9
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Cheers for that Loco,

Happy Boating to you
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