Is my raw water pump supposed to leak?

[wakesetterDD]

I have seen water coming out of the gap in the middle of the raw water pump.  I don't think it did it for a long time but is this normal?  I have a 99 VLX.

[BlindSquirrel]

Mine doesn’t leak...I think the only thing that is acceptable to “leak” is the packing nut on the drive shaft. There is a seal on the backside of the raw water pump facing the engine that is most likely tired. If it’s a slow drip, I wouldn’t let it bother me.

Edited October 9, 2018 by BlindSquirrel

[mgb1974]

Bad, replace it.

mine went out a few seasons ago. Didn’t realize it and boat would go into limp mode from getting to hot. Had a bad gage also.

 

i think it took me about an hour to replace.

[Choiceind]

Nope.. replace it. They do sell rebuild kits,, I would just a new one. Comes with impeller too. Bakesonline.com

[Eagleboy99]

The old ones used to leak a bit.  like your 99.  But I would start shopping for a new one.

[justgary]

3 hours ago, wakesetterDD said:

I have seen water coming out of the gap in the middle of the raw water pump.  I don't think it did it for a long time but is this normal?  I have a 99 VLX.

www.oringsandmore.com part number 16x28x7 Buna-n oil seal.  I bought a sack of ten of the seals and have fixed three pumps so far.  The bearings are always good, just the seals that start leaking.  No need to buy a new pump.

Remove the pump and impeller, put it in your vise, gently drift the shaft out (with the bearings, as I recall).  Tap the old seal out, tap a new one in, tap the shaft back in (remember to put the o-ring back on the shaft in the right place; it keeps the water dripping off the shaft instead of running into the bearings).  Ready to install on the boat in five minutes.

 

[Chaabo]

Mine started leaking at the back as well after about 550hrs.

I read a lot about replacing that fore mentioned seal (mostly on the Mastercraft forum), even found a PDF on how to there, but also read of premature failure of these replaced seals, so I decided to just replace the whole pump, as I needed a new impeller anyway.

I bought the new one from Marine Parts Source in Marysville, MI. It came with the impeller already installed. I had to paint it black though, as it came in raw bronze finish.

Johnson F6 Extra Flow Crankshaft Pump JP 10-24915-01 $160 shipped

Edited October 10, 2018 by Chaabo

[justgary]

I can buy a whole bunch of prematurely failed seals for $160.  Eventually the shaft will wear a groove, but the trick is to replace the seal at a slightly different depth to avoid the groove.

Honestly, this job is simple to do and the seals are cheap.  SKU #OS16287.  $1.75 each.