water pump seal 85 400

which way does the water pump seal face ....

Flat face to the left of the engine. I am sure you speak of the seal behind the impeller.

I made up these repair plates for when there nothing left to hold the seal.

My cover for the 400WRX needed a new seat for the seal. I cleaned it out, filled with JB Weld and had a local shop bore the seat in position.

so the oil is against the open side with the spring...ive heard differently?

pg 13 86 2 t manual shows the seal with the spring facing the water jacket...? ill go with that i rekon as the water pressure would hold the seal closed...maybee??

The bearings are the seal for the oil.
Any seal goes with the spring to the fluids.
the weep hole under the water pump is there to stop coolant from going in to the oil and leak externally.

Steve

I would think we are keeping the water out of the oil not the oil out of the water.. Spring out?

all good stuff, spring out is the go...thanx for the comment, nothing worse than getting old and going .."now how did that come apart again?? why didnt i take a photo of that??"

The weep hole let’s us know the seal isn’t sealing anymore.

Good question on which way the lip of the seal goes. I have seen even the crankbearing seal on the tranny side installed backwards. The lip side meaning the spring side goes towards the liquid. Meaning the coolant side. With the crank seal on the tranny side the lip goes towards the tranny oil.

I put mine spring towards the water the theory being that the coolant increases pressure as it gets hotter. My radiator caps are 11 lb.

I have one of these fitted to my 400 , it covers the whole area under the pump ''o '' ring included.

I have wondered about seal lip orientation when replacing water pump and crank seals. After reviewing the attached page I will be installing the seal lip on water pumps towards the engine coolant due to the pressure, and crank seal lip towards the transmission as the gear box oil level bathes the seal.

The SD seal mentioned below refers to double lip seals, i.e. seals with main sealing lip and a protective dust seal.

Don’t forget to prelube any seal and shaft where it rides. If left dry the seals life can be cut short.

Note, if any shaft has a score line from a seal don’t install the seal back to its orginal location leave it out just a tad so it rides on a new flat clean surface. This happens a lot with harmonic balancers on car engines. It’s just food for thought for other applications. I’m just sharing knowledge.

The seal in the pic that Auto posted shows the seal behind the impellor is correctly installed.

As I recall when I pulled my cover apart, there was an inner seal on the inner side of the weep hole because the bearing itself was not sealed

all back together now so its what it is. thanx all for your input

Last pic, Page 13 and first pics, page 14, shows the seal orientation,

Spring on seal towards the impeller.

http://hva-factory.com/files/husqvarna-workshop-manual-2-stroke-engine

I agree with this logic, but ALL the factory seals I've pulled out have had the spring toward the crank. So, that's how I put them back in. I have seen replacement crank seals installed the way Bill describes and, guess what? They work fine, too.

Now, with the high and hot water pressure, I like to put the spring toward the coolant. Maybe it's just me, but it works.

On my 400, the outer water pump bearing has a sealed side. I put that facing away from the crank. I put the water pump seal with the spring facing the impeller. That way if the water pump seal leaks it drips out the weep hole and nothing gets into the trans oil.

The correct seal is double lipped (lipped in both directions) that way you can deal with pressure from either side....

Andy.