The Socket, Washer & Oil Seal
This is what I use to press the oil seal into the pump body with. When pressing in the oil seal DO NOT drive it all the way in. Press it in so it is just slightly proud of the weep hole. The spacer and water seal, when pressed in on top of it, will seat it to the proper depth so it does not interfere with the bearings. You CAN over seat the oil seal if not careful..
Pressing In the OIl Seal
Here is the socket with nylon washer pressing in the oil seal.
Oil Seal Seated
If you click on this image and blow it up you'll notice some red paint. This paint is the weep hole. The oil seal is just slightly proud of the weep hole so when the water seal and spacer are installed on top it gets seated to the precise depth needed without impinging upon the bearings.
Before sliding the seal over the shaft it's a good idea to pre-lube it with some motor oil. I usually just tip a bottle of oil over, there right side up again, quickly and with the cap on, and this leaves enough oil on the underside of the cap to dip your finger into.
Before installing the pump on the motor it would be a good idea to squirt a little oil into the bearings with the pump sitting on its face. Gravity will bring the oil to the seal. Doing this will pre-lube it prior to installation. I would advise draining this oil though before installing it. This will prevent getting oil on the gasket. All you need is a surface film of oil to prevent a dry start.
Pressing In The Water Seal
As you can see I am using a socket that fits just inside the metal seal cap of the water seal. This worked very well for seating the water seal.
Spacer / Weep Hole
If you blow this one up and look carefully you can see one of the spacer feet. This photo should explain why the spacer is important. It keeps the two seals apart to prevent a water side leak from getting into your engine oil.
Install The C-Clip
Just as you removed it, reinstall the c-clip or retaining ring.
Install The Impeller
When you install the impeller it is important to apply a liberal amount of Glycerin or "Impeller Lube" to the pump body and the impeller. Glycerin can be purchased at any drug store for far less than it is sold as "impeller lube".
Contrary to the myths about aligning the vanes in a certain direction, it really does not matter. Just squish them and install the impeller, they will orient the minute you hit the starter button.
It is not advised to use petroleum based lube products on impellers as these greases or oils can damage and shorten the life of the impellers rubber compound.
Apply the Gasket
These gaskets tend to suck. To aid the gasket in making a good seal I use HondaBond 4 (do not confuse HondaBond 4 with HondaBond HT which is silicone).
Personally I do not like silicone gasket maker and much prefer products like HondaBond 4, YamaBond or ThreeBond 1104. A product called "The Right Stuff" from Permatex is also similar. These sealants do not totally cure, remain flexible and will not contaminate sealing surfaces with silicone.
Do not over apply any gasket sealer. You only need enough to have skim coat on the surfaces..
All Done !!
The pump is ready for paint then for use...!