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hey guys, the impeller on my 4hp 1973 johnson outboard went out. I ordered the impeller kit already, but i have never done this before. anybody have information on what i need to do, how to do it, and what to look out for? thank a lot
 

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Straightforward. You have to drop the lower unit, the only tricky thing here is corroded bolts (don't force them) and the water pickup tube ( it has to align on assembly, self-explanatory). When assembling, twist the impeller in the water pump housing in the same rotation direction as the old one, and use plenty of grease on the bolts during assembly. Make sure the water pickup tube is clear and bolt up the lower unit. It is a great DIY project, take your time and use OMC grease or trailer bearing grease for assembly.
 

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C_McCann said:
Straightforward. You have to drop the lower unit, the only tricky thing here is corroded bolts (don't force them) and the water pickup tube ( it has to align on assembly, self-explanatory). When assembling, twist the impeller in the water pump housing in the same rotation direction as the old one, and use plenty of grease on the bolts during assembly. Make sure the water pickup tube is clear and bolt up the lower unit. It is a great DIY project, take your time and use OMC grease or trailer bearing grease for assembly.
No reverse on that one?
If it has a drain plug and a fill plug, remove those first, drain oil.
Spray bolts with WD or simular spray.
I used anti-sieze on bolt threads for reassembly.
Alot of outboards you have to fill the oil from the bottom drain
hole with a pump and fill until the oil flows out the top hole after pushing the air out.

Good Luck, DR

PS, Next time use the Private Boaters Technical Info board.
 
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