leaking waterpump

I found my 03 crf450 leaking water from th eweep hole, what parts do I need to get to fix it, also, is there any thing else I should replace while I'm doing this? :naughty:

Do a search...there's more on this than "what kind of oil"...

What's the tool to pop the bearing out of the side case to get to the seal? I didn't know about that weap hole till yesterday. I've been fighting keeping fluid in my bike forever and I noticed yesterday that it looks like it's been weaping out that hole for a long time now!!! I'm riding it again this weekend and will watch it to see what happens. Anyways, just curious if there's a trick to popping out the bearing... The book shows some random tool, slide hammer type thing...

Khris

No special tools needed, just replace the O-ring gascket on the water pump

Your seal(s) are leaking. If you get water out the weep hole then your outer seal is shot. Replace both seals as well as the bearing and shaft. You may also need to replace the clutch cover gasket if it rips when you pull it off. Its not a tough job but it requires pulling the clutch cover, kick start lever and the impeller off. You also have to drain you tranny oil and rad fluid.

Really its not bad at all.. took about an hour with all the parts in hand.

I replaced the shaft bearing, Oil Seal, Water Seal & Case Cover Gasket.

You can just use a socket to knock the bearing out of the cover.

I didnt need to replace my shaft, I cought it as soon as the leak started & when I looked it over there wasnt any wear. Alltogether I Think it cost about $60 for all the Parts, Coolant & Oil. Not too bad considering the dealer will charge about $300

I did mine on the trailer at the desert last friday. Pulled the waterpump cover. Put the bike in 5tha nd stood on the brake. Busted loose the impeller and spun it off. Straight slot screw driver popped out the seal around the shaft. Used a large socket to seat the new one. Reinstalled everything and topped it off with water to make sure it wasn't still leaking. Dry as could be... Drained the water and filled with engine ice. Took maybe 25 minutes total on the spot!!!

I just replaced the entire setup about 6 months ago, and she's leaking ago :)

I'm going to have to just replace that outside seal this time, as it's not leaking otherwise. Damn thing.

I just replaced the entire setup about 6 months ago, and she's leaking ago :)

I'm going to have to just replace that outside seal this time, as it's not leaking otherwise. Damn thing.

Make sure you didnt put the seal in backwards, because it will still leak if you did and they're not reversible. How do I know? Three guesses, first two don't count.

Make sure you didnt put the seal in backwards, because it will still leak if you did and they're not reversible. How do I know? Three guesses, first two don't count.

Thanks, I'll check that. I don't think I put it in backwards, but stranger things have happened. :)

I did mine on the trailer at the desert last friday. Pulled the waterpump cover. Put the bike in 5tha nd stood on the brake. Busted loose the impeller and spun it off. Straight slot screw driver popped out the seal around the shaft. Used a large socket to seat the new one. Reinstalled everything and topped it off with water to make sure it wasn't still leaking. Dry as could be... Drained the water and filled with engine ice. Took maybe 25 minutes total on the spot!!!

If done this way do you have to drain the tranny fluid??

anyone? Bump

Nope, didn't need too...

Nope, didn't need too...

Dude thanks that was one of the easiest fixes to my bike ever! Maybe 20 minutes...tops!

anyone have any photos of "the right way" to install this gasket? i just did mine and snaped a few ill have to put them up here.... and now its leaking worse than it was with the old one... GRRRRR

i just ordered the 2 seals, bearing, and shaft... so maybe this will fix it...

is it ok to put grease on the shaft so its not spinning dry on the first start up?

I installed my first seal backwards. If you are only changing the water (outer) seal, just remove water pump cover and impeller and remove the seal. When you install the new seal make sure the spring on the seal faces you. The spring must face the wet side and if you do like I did I just installed it with the spring facing the inside not thinking that I am on the inside of the coolant system. The spring fails very quickly if you face it to the weep hole. I always lube the shaft before installing the seal but it comes with a little too.

Good Luck... I change one every spring.

jclark@barriersafe.com

To just replace the water seal you do not need to take off the case cover, drain transmission oil or anything like that. As sirhk says above:

* Drain (whatever is left) coolant

* Remove water pump cover

* Put bike in 1st gear, stand on rear brake (to stop the engine turning while you...)

* Use 10mm socket to remove impeller

* Pry out (bad) water seal

* Pop in new water seal. Use a reversed 22mm socket and a rubber mallet to gently drive the seal home

* Reattach impeller and water pump cover. Refill. Ride.

Of course, I'm doing unnatural things to my CRF450 engine (roadracing). My water pump seal fails regularly (usually after about 5-10 hours on track). I have the change down to 5 mins.

A more permanent fix is to reseat the counterbalancer bearing (the impeller shaft connects to this bearing, and if it's loose in it's seat it makes the impeller shaft wobble, which in turn is what causes the water seal to fail). To do that:

* Drain coolant and transmission oil

* Remove case cover

* Jam a penny between the gear on the crank and the counterbalancer gear to stop them turning.

* Remove the counterbalancer gear (need a special crown tool for that)

* You find the bearing underneath wobbles around. Remove it. Peen the seat in 10-15 places then reinsert it. It should be much more stable.

* Reassemble.

With ultra-hard use the bearing seat becomes too ovaled for even this trick to work for more than a few hours. At which point it's time to replace that side of the case.

Enjoy!

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