Water Pump Seals

[rokyluk]

So wich parts exactly do you need for fix this problem...

[kzmille]

Oil Seal 0650315 (Not 0650310, this part has been superseded); Sliding Ring (water seal) 0650370; and Water Pump Shaft (if needed) 0220410.

[rokyluk]

Oil Seal 0650315 (Not 0650310, this part has been superseded); Sliding Ring (water seal) 0650370; and Water Pump Shaft (if needed) 0220410.

Thank you man, you are no.1

Thanks again.

BYe

[xbacksideslider]

It is an odd and almost inexplicable thing but I have seen automotive water pumps suddenly start leaking out of their weep holes when the engine's coolant is changed.

Most common is when a coolant flush is done and the engine is filled with water, run, re-filled with water, run and so on. No problems. Then, when new coolant is introduced, suddenly, the pump starts weeping.

Maybe the water allows a contaminant to stick onto the ceramic rings' faces, maybe the change to water removes something from the faces, maybe the new coolant has too much lubricity, go figure. It happens.

[Clivoris]

Mine was repaired a whiles back because of the oil leaking out. It still occasionally dribbles a bit of coolant onto the exhaust but it isn't too much of a prob. Anyone know if I should be worried?

[hertz_14]

It is an odd and almost inexplicable thing but I have seen automotive water pumps suddenly start leaking out of their weep holes when the engine's coolant is changed.

Most common is when a coolant flush is done and the engine is filled with water, run, re-filled with water, run and so on. No problems. Then, when new coolant is introduced, suddenly, the pump starts weeping.

Maybe the water allows a contaminant to stick onto the ceramic rings' faces, maybe the change to water removes something from the faces, maybe the new coolant has too much lubricity, go figure. It happens.

There may be something to this.... I had a clutch cover gasket leaking, so i did a flush during the replacement....Now- Leaking water pump weep hole, coolant style. Hopefully I can pull off a miracle during replacement, as to actually fix the leak.

Kzmille, dude- this info is priceless. for your hard work.

[kzmille]

It is an odd and almost inexplicable thing but I have seen automotive water pumps suddenly start leaking out of their weep holes when the engine's coolant is changed...

I really don't have an answer for that and I have never really had that sort of thing occur. I can only think that the thing was compromised and was getting ready to start leaking no matter what. The way these mechanical seals are made there is a rubber boot surrounding the spring. Perhaps in some of these cases the boot had failed rather than there being a problem with the rings. ???

[kzmille]

Mine was repaired a whiles back because of the oil leaking out. It still occasionally dribbles a bit of coolant onto the exhaust but it isn't too much of a prob. Anyone know if I should be worried?

There is always the possibility that the rate of loss could increase dramatically but it could go on the way it is for years.

[hertz_14]

So I'm guessing that the pump shaft has to be pressed out outside in, meaning push the threaded side through the seal to the inside of the case? (for removal of the shaft)

[kzmille]

I used to do it that way. Now, after removing the drive gear, pin, and shim I tap the back end of the shaft with a soft hammer. This quickly and easily drives the shaft and inner part of the water seal out towards the outside of the case. I made a little jig that I set the shaft in to drive it out of the seal center part. Just a piece of aluminum drilled so the shaft slips into and the seal seats against.

[hertz_14]

One more thing....

Got the seals out, made the collar pin and the anvil, ready to install the seal. Does the procedure require assembly lube on the water pump seal while installing on the shaft?

[kzmille]

No, I usually smear a very small amount of RTV silicone sealant on the shaft to ensure a water tight union but it is not called for and I don't think it is necessary. I don't think anything is required but I don't think assembly lube would hurt either.

[iconic944ss]

Hi, New member from the UK signing in.....

2001 Falco that I'm very happy with APART from a intermittent water leak that appeared at the end of last season.

Always appeared AFTER the bike had cooled down and from a location I couldnt determine which i thought might be behind the oil tank.

I now guess (and will check from a previous thread photo) that it might be from the weep-hole and is actually running down the casing and dripping off at the engine low point?

Could someone describe the location of the weep hole please?

Also is something like the use of radiator sealant (Barrs or Radweld are commercial names here in the UK) advised or not for water leaks on the rotax engines generally? Both are specified for Aluminium components so I dont see materials being an issue.

Thanks in advance - Frank.

[kzmille]

Radiator leak stop products like Barrs will not do anything to help a leaking water pump seal. The only cure is to replace the seal.

The weep hole is at the front of the primary cover on right side of the engine. It's hidden behind a reinforcement on the case. The red wire is in the weep hole.

[Clivoris]

Hi kzmille.
just a point of clarification for me. Does the leaking of any amount of coolant from the weephole indicate that the seal requires (or will soon require) replacing?