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Impeller replacement

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RonJon27

New member
I have a 2004 Johnson 4 stroke, 40 HSP, Serial number 17022468, Model: J40PL4ST. Before I put the pontoon in the water, I noticed that no water was coming out the cooling exit port. I suspected I needed a new impeller. I dropped the lower unit and saw that I had a hard cast impeller housing so all I needed was the impeller, ware plate and gaskets. I replaced all those and the project went smoothly. When I reassembled and tested the engine, with water being fed through water headphones, it started to spit water and then only spat out air with just a little water. I suspect that maybe I'd not put the "key" in properly, so I disassembled and inspected it all again. Everything was done correctly. Is it common for this to happen? Does it maybe take a long time for the water to circulate through the engine? Will it only circulate after a period of time? Please offer any advice you may have. I'd really appreciate it before I put the pontoon and motor in the water. Thanks.
 
I've seen it suggested more than once by the Pro's here that testing a water pump install on muffs with a hose can be unproductive test as too much or not enough pressure can be misleading. Best to test in a barrel with water level 6" over the pump or at normal water depth when on the boat.
 
I would check the water intake, and the tube that leads from the pump to the engine for any blockages of some sort.
Maybe you have a clump of weeds or a mud dauber nest stuck in there.
 
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