Impeller change on a 2001 SAN GT-40... How to w/ pictures

[TravisFling]

This may just be me, but I always put a little lube on my impellar. I usually just use vaseline, or something, so that it's not spinning hot for the first turn of it's life. I replace every year and have noticed that the years I put the lube on it's usually in better shape than before I did that. I don't know that it makes a difference or not, but....

[jhiestand]

The PCM impeller kit I've always obtained doesn't have the gasket either, just the o-ring. Mine doesn't leak a drop w/out the cardboard gasket. Apparently there are different replacement kits?

[WakeSlayer]

The one I just put in the old Mustang had like eight gaskets and the O-ring. This pump just uses a gasket. No O-ring.

[ccrider89]

DavidF wrote
No, the brass plate is sandwiched between the two pump halves. Gasket on one side, o-ring on the other.

There's the difference my pump does not have two halves, Mine is like the pictures above. There must be an awful lot of different pumps out on the market

[DanielC]

Very good thread! I use dishwashing soap, diluted in water for my water pump lubricant.
Another thing I do is polish the brass plate on the side that is next to the impeller. If the grooves are too deep, you can turn the plate over and polish the other side. I use a fine grit of wet or dry sandpaper, on something flat.

[AirTool]

Very good thread! I use dishwashing soap, diluted in water for my water pump lubricant.
Another thing I do is polish the brass plate on the side that is next to the impeller. If the grooves are too deep, you can turn the plate over and polish the other side. I use a fine grit of wet or dry sandpaper, on something flat.

Ditto...I squirt is some ivory dish soap. Then turn the pulley in the proper direction as I push the impeller in.

My first impeller change was in a 120 hp Mercruiser i/o ...probably over 30 years ago.

[DavidF]

DavidF wrote
No, the brass plate is sandwiched between the two pump halves. Gasket on one side, o-ring on the other.

There's the difference my pump does not have two halves, Mine is like the pictures above. There must be an awful lot of different pumps out on the market

Now, I am confused...the only pictures on this thread show a Sherwood pump that indeed is broken down in two parts (halves if you will) in order to service the impellar. The proper way to reassemble the pump is to use a paper gasket AND o-ring as I mentioned earlier.

[SquamInboards]

Also never hurts to put a little lubricant on the impeller when it goes in, or when you put it away at the end of the season, so that it never spins completely "dry" in the housing, when you launch it for the first time. Even a little wd-40 does the trick.

[liquid-diet]

i forgot to mention that, i did put a little wd-40 in it to lub it. The kit i bought had a tone of paper gaskets and 1 o-ring. There is no use for paper ones with the rubber o-ring in place.

[jchamlin]

Since I'm considering doing this on my own, I asked David @ White Lake. Note: there are other Nautique dealers closer, but I've found that White Lake has the best service and knowledge...and I also bought the boat there.

From David:
OK the O-ring and gasket seal two different surfaces.

The "wear plate" uses the paper gasket behind it.

You've got the Part with the grove that holds the o-ring, and the impeller sits in that half.... Then the part the o-ring seals to is called the wear plate, the other side of it is where the paper gasket is used. between the wear plate and the front of the pump.

Now may times people replace the impeller and only change the o-ring, BECAUSE, the wear plate stays sealed to the front of the pump. Thus no seal broken, no need to change... However, if the wear plate is not sealed good, then you would replace the gasket. Clean the surfaces and use some gasket sealer (not thick silicone, but the thin stuff to make a gasket work better) Napa and some auto parts stores call it Hi-Tac some times....

liquid-diet - I didn't see any paper gasket if your pictures and was not sure if the wear plate was something else you could have taken apart. I gathered from David's comments that you don't really need to mess with it unless you have to.

[SquamInboards]

oops, didn't see the post at the top of the page, regarding lube... sorry to be redundant! Also, in hindsight, you can see a can of wd-40 in the pics!

[liquid-diet]

yea never saw a wear plate, so must have stayed sealed.

[DavidF]

Your image IMG_2579.JPG shows the wear plate. If you lift the plate off the bearing/pulley side of the pump, you will see the paper gasket.

[steve-o]

If you didn't have the brass plate on your impeller, then you would not use the paper.

Your image IMG_2579.JPG shows the wear plate. If you lift the plate off the bearing/pulley side of the pump, you will see the paper gasket.

I don't think that's a plate. I think that's just the discoloration from the covered surface to the uncovered part.

My Sherwood does not have a plate either.