Sierra water pump for a Johnson

[WaterWitch2]

I put a Sierra water pump kit on my Johnson 1978 140hp and the housing had no provision for the upper seal. It has ribs in the location that the seal would go. The original one did have a seal. Is the Sierra kit redesigned to not require the seal? I ran it on muffs one time after I did it and it pees well and has plenty of water out the exhaust. Should I be worried or should I take the boat out and just run it?

 

[reload]

Re: Sierra water pump for a Johnson

Not sure about that particular motor but some just use sealant. Are you sure someone did not put the gasket in when it was not required?

 

[WaterWitch2]

Re: Sierra water pump for a Johnson

The seal I'm referring to is #31 in this diagram. It is a lip seal.

 

[reload]

Re: Sierra water pump for a Johnson

I think it should have that seal.

 

[WaterWitch2]

Re: Sierra water pump for a Johnson

The problem with the Sierra housing is that there's no place to install the seal. The water pump kit didn't even come with a seal.

 

[reload]

Re: Sierra water pump for a Johnson

You replaced the whole housing, it would only stand to reason if the new one did not have a place for the seal they wouldn't send you one.

 

[Gary H NC]

Re: Sierra water pump for a Johnson

I ran into that Exact same thing on mine. I could not figure out why no lip for the seal.I ended up using my old housing and just putting the new impeller in it.
I thought it may be a screw up by Sierra..

 

[WaterWitch2]

Re: Sierra water pump for a Johnson

I ran into that Exact same thing on mine. I could not figure out why no lip for the seal.I ended up using my old housing and just putting the new impeller in it.
I thought it may be a screw up by Sierra..

My housing was slightly melted or I would have used my original housing to solve the problem.

 

[WaterWitch2]

Re: Sierra water pump for a Johnson

bump

 

[Dhadley]

Re: Sierra water pump for a Johnson

The OMC / BRP housings no longer use that seal either. They all have ribs in that spot.

 

[WaterWitch2]

Re: Sierra water pump for a Johnson

So I shouldn't worry about it and run the boat?

 

[HighTrim]

Re: Sierra water pump for a Johnson

Id just use a gasket sealing compound on it, but one of the mechanics on here may know better.

 

[Dhadley]

Re: Sierra water pump for a Johnson

Nothing to worry about. Just go have fun. When they first changed that we cut those ribs out and installed seals on the race motors. Never saw any difference so we quit doing it.

 

[28sstony]

Re: Sierra water pump for a Johnson

Im having this exact same problem right now.

So, I guess the verdict is that there is no seal and just put it together and run it??

 

[ezeke]

Re: Sierra water pump for a Johnson

As Dhadley said, the new OEM pumps don't have the seal. They do have a seal (o-ring) between the top of the steel cup and the housing that needs to be in place.
Click the thumbnail below for the diagram that comes with the new OEM pumps.

 

[28sstony]

Re: Sierra water pump for a Johnson

Thanks a ton for that pic!

the pump kit I bought didnt come with any instructions whatsoever.

 

[ezeke]

Re: Sierra water pump for a Johnson

A lot of Sierra diagrams are on line: http://ww2.sierramarine.com/sierra/catalogjava/view/222_seloc.asp

 

[28sstony]

Re: Sierra water pump for a Johnson

OK, There are 2 o rings, the larger of the 2 is more like a gasket. For the life of me I cant figure out where theese two parts go. nothing that looked even close came off of the old pump.

 

[ezeke]

Re: Sierra water pump for a Johnson

Depends on the kit; OEM or aftermarket.

On the OEM kit there is a larger groove at the bottom of the impeller for a o-ring, so that the impeller can only work in one direction.

Then on all kits there is a wide o-ring that fits very well between the top of the steel inner impeller housing and the water pump housing, and, finally, the o-ring that goes in the groove at the top of the drive shaft to keep water from rusting the inner cavity of the crank shaft. The top of the drive shaft still needs the Moly Lube on the splines.

 

[28sstony]

Re: Sierra water pump for a Johnson

OK, the one on the right fits the top of the driveshaft perfect. The one on the left actually has squared edges and isnt like a standard O ring. The O ring between the steel liner and the plastic housing is already in place.