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Old 15 July 2003, 16:42   #11
Country: Ireland
Town: Dublin
Boat name: wizzard
Length: 7m +
Engine: 225 optimax
Join Date: Sep 2002
Posts: 835
Pump overhaul

This is a pretty easy job to do, remove the bolts bolting the lower leg on to the casing mostly located at the cavitation plate level, plug off the plastic cap over the anode I think it needs to come out also, under the cavitation plate there is a sneaky recessed bolt, when all are out lightly tap the casings apart.On the top of the drive shaft sits a rubber seal and a spacer made of plastic these will drop out when the lower unit is removed dont panic if they fall on the ground ,they sit on the top of the splined drive shaft seal to top and spacer under it, the pump sits on top of the gear box it will be vissible when the unit has been opened, a replacement pump gasket comes with the new impeller.Before doing this try reverse flushing with a garden hose to clear the engine waterways of blockage, or sand grit etc.My 50hp merc initially didnt squirt only after a min when stat opened did it squirt,if it was cool enough the squirt would stop and the stat closed, opening soon after, ( i didnt have a jet all the time).As you fit the new impeller turn it by hand to fit it in.


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Old 16 July 2003, 03:21   #12
Country: UK - Scotland
Town: Greenock
Make: Flatacraft Force 4
Length: 4.3m
Engine: 50hp Mercury
Join Date: Jul 2002
Posts: 19
Cheers for the help so far folks....
I started working on the engine last night. I took off the water feed pipe that runs from the bottom of the water jacket, to the outside (this is what the water jet passes thru). Cleaned out the pipe and this fixed the water spray problem!

Got another bit of advice last night saying that the 2/3rds power problem may be caused by problems with the coil. The problem being that the coil is breaking up when it gets hot and this could cause the power loss?

Does this sound like a plausable answer to my problem?


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Old 16 July 2003, 03:30   #13
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Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Certainly a possibility as well as another dozen other things it could be!

Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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