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Old 19 June 2017, 08:29   #1
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Country: UK - Scotland
Town: Inverkip
Boat name: Crusader
Make: Redbay 8.4 Exped
Length: 8m +
Engine: yamaha sterndrive
Join Date: Nov 2004
Posts: 755
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Yamaha 2hp 2B water issues

Noticed last year that our rarely used Yamaha 2b 2HP was struggling to pump water and that anything that did come out of it was red hot.

So, I purchased an impellor for it and dismantled the lower leg to gain access only to find that the impellor was in perfect condition. I also made sure that the pipe that goes up the leg was seated properly on fitment.

Once she was all put back together I tested it again only to find scalding hot water dripping out of the bottom of the cowling ? ? ? wtf

After a quick inspection I think its coming from where the engine meets the drive leg. surely if it had a gasket issue it wouldnt run properly. This engine literally starts first time, anytime no matter how long its been sitting!
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2006 Redbay 8.4 Expedition "Crusader"
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Old 19 June 2017, 08:38   #2
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Country: UK - England
Town: Cambridgeshire
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Yam 15 Tohatsu 9.8
Join Date: Nov 2007
Posts: 8,297
Have a look at this pic of my rarely used Mariner 4hp. Like yours the impellor was fine but despite flushing after every use the waterways were fully of salty jelly.
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