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Old 12 August 2011, 03:29   #1
Country: UK - England
Town: Ipswich
Boat name: Jammy Dodger
Make: Avon Adventure 7.20
Length: 7m +
Engine: 200 Yamaha
Join Date: Dec 2008
Posts: 345
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2003 Yamaha 200 4stroke - not pumping water

Had a new impellor last week, was running fine last weekend, started up on the muffs last night, not a drop, inspected impellor, that looks good as new. tried poking out the hole where the tale tail water comes out, but still nothing.

have tried both muffs/ the hose attachment that can be used for flushing when boat is in water.

Started it up this morning and it pumped for about 5 seconds, then back to nothing again.

Any ideas?



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Old 12 August 2011, 06:31   #2
m chappelow's Avatar
Country: UK - England
Town: yorkshire
Boat name: little vicky
Make: avon ex RNLI
Length: 3m +
Engine: tohatsu
Join Date: Mar 2008
Posts: 2,310
It could be that the Impeller is not connecting and turning with the drive shaft ,perhaps a small woodruff key or the like has corroded or been left out and is not engageing or that the new impeller slot is a bit larger letting the key slip .
also on some cheaper non standard parts the hub on the impeller may have seperated from the main body where it is moulded causing it to slip and not engage the drive shaft ,,
eg ,shaft turns but not the blades of the impelller,

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Old 12 August 2011, 07:33   #3
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Also check the water pump outlet is connected properly to the pipe inside the leg.
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