Raw Water Pump Teardown

[Prostar Rich]

Originally Posted by rkmason

The pump I rebuilt was 10 years / 470 engine hrs old. I cannot say there was really anything wrong with either the bearings or the seal that I replaced so I guess it had some (maybe alot) of life left in it. I did my pump rebuild more just to see if I could do it myself. I'll definitely go longer this time around.

Thanks for the info. Last year I has chasing down an overheating issue and the RWP checked out however the boat is a 1990 with about the same hours as listed above. I was just wondering what kind of life I should get out of it.

Thanks again,
Prostar Rich

[Tom023]

You might want to take a look at this, posted by Engine Nut sometime ago. I disassembled mine to replace the shaft seal without any special tools, but if you are replacing the bearings, looks like some are needed.

[flipper]

I have to agree with most of the above....get a new one. Much less of a head ache, and no worries of messing something up, and having to replace it anyway.

[rkmason]

Originally Posted by Tom023

You might want to take a look at this, posted by Engine Nut sometime ago. I disassembled mine to replace the shaft seal without any special tools, but if you are replacing the bearings, looks like some are needed.

Yes, that is pretty much exactly what I did, but without the luxury of a press. At a minimum you do need a puller to get the bearings off of the pump shaft.

[Chief]

After tearing mine out today, I think I will buy a new one. I have a small leak and as much as a pain it was to get it out, I'm not risking a rebuild!

[Snipe]

Originally Posted by Jim@BAWS

Don't waste your time. 3 hexhead screws and one at the base of the pump and you are done. A rebuild kit with a bearing kit is about $60

No guarentee that it will work

Just buy a new pump. A new impeller comes with it

Jim@BAWS

I'm with Jim

[GoneBoatN]

Funny, I've always wondered about this. I too figured it was easier and cheaper in the long run just to replace. Nice to know I'm not the only person on that bandwagon.

[mikeg205]

Gotta go +1 on a new pump.... $250 - cheap insurance and piece of mind... $200ish if take the cost of impeller out.

Plus it's new and shiny...lol

[homer12]

I am in the processing of just doing the seal on mine. The bearings seem totally fine. I have the shaft and bearing out and was able to put the pump upside down in the bench vice with the flange on the housing against the vice and pound out the shaft. I used a hammer and a solid round piece of stainless I had about the same diameter as the shaft. Will post pics when I get done.

[CantRepeat]

Originally Posted by homer12

I am in the processing of just doing the seal on mine. The bearings seem totally fine. I have the shaft and bearing out and was able to put the pump upside down in the bench vice with the flange on the housing against the vice and pound out the shaft. I used a hammer and a solid round piece of stainless I had about the same diameter as the shaft. Will post pics when I get done.

For future reference I would recommend a brass drift or punch if you are going to use the hammer method to extract the pump shaft. Using a softer metal drift will have a lesser chance to damage the shaft when compared to a SS drift.