Background:
During the survey, it was noted that there was a water leak at the water pump. Of course, the owner said that it was most likely the $8 gasket between the manifold and the pump... Surprisingly this was not the case. Instead, the water was leaking drip by drip at the window between the impeller and gear side.
After doing a bit of research on BoatDiesel I found that this is quite common and most folks had swapped their pumps out for a rebuilt one or whatnot.
Digging into it:
I did this procedure last weekend. Fired up the boat with garden hose in strainer (barely keeping up at idle) and was able to pinpoint the leak for the first time.
The hoses and manifold came off very easily. The pump was a slightly different story as it used two studs and has to be convinced a bit to come out when those studs are in place. I forsee this being more of a pain when I got to re-assemble so I removed both studs and picked up some M10 - 1.25 X 30mm stainless bolts with lock washers for reinstallation.
Once I got the pump out of the boat and onto the workbench (i.e granite countertop island in the kitchen on top of an Amazon box) I was able to inspect the pump. The next steps were as follows:
1. Remove the 4 screws and plate covering the impeller/
2. Yank the impeller out with needle nose pliers.
3. Remove the nut that holds the gear on. (this was torqued on with 8 million ft/lbs. I used a 9/16" socket for the impeller side to hold the shaft with 22mm socket over the nut on the other side)
4. Use a gear puller to get the gear off.
5. Tap the shaft with rubber mallet from the impeller side to force the bearings out the oil side. This took a while and there are probably much better ways to accomplish this but I'm limited on tools.
6. Inspect/remove the seals.
The seals were easy to remove. I found that they are garter seals with springs. The oil side was fine but the water side was rusty and had a crack in the seal (hence the leaking).
I ordered a rebuild kit that included all seals, bearings, manifold gasket, o-rings, that weird ceramic looking spacer, etc... for around $110. I'm really hoping it has the SS garter spring to prolong the life of this seal.
Below are the pics in order. I'm getting the rebuild parts today and I'll post pics of it going back together once complete.
Hope this can help someone in the future, overall a pretty easy job relatively speaking.
Water Leak while running
Pump Removed
Impeller
Gear pulled, now need to remove RUGGED snap ring.
Snap Ring out
After tapping shaft out
Housing and bad seal
Good seal on oil side
Spacer and o-ring after bad seal has been removed (these just pop out). The o-ring is free floating on the shaft and I believe just keeps water away from the oil seal in the event of a leak.
Bad seal.....
Spacer removed
Oil seal removed
The bearings will be pulled from the shaft as well and replaced. I'll update hopefully in the next couple of days.
