HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
albertlui

coolant leakage from the hole under the water pump

21 posts in this topic

I would say your water pump seals are bad , Time to rebuild it . it may also be getting into the oil. If your not careful you could trash your engine if you run it like that. there is really to much to it . here's a pic of a 05's you'd need parts 3,4,5,6

0005.jpg

Share this post


Link to post
Share on other sites

The weaper hole is there to let you know when your seal is bad. An O6 and bad already. My 03 had a burr on the pump that would nick the seal. So if you change the seal and it leaks again look at the pump.

Share this post


Link to post
Share on other sites

Definitely the water pump seal, I've replaced mine a few times. You should replace the shaft along with the water pump seal. A rough shaft will chew up the new seal pretty quickly.

If oil comes out of the vent hole you know your oil seal is bad, coolant means the water pump seal. even if the oil seal is good, for the extra 5 bucks you may as well replace it while you have the engine open.

1 person likes this

Share this post


Link to post
Share on other sites

Thanks all.

Just remove the pump cover can replace the water & oil seal? My friend with a WR400 said that he need to remove the whole side cover. If that is true, I need to buy the gasket.

Share this post


Link to post
Share on other sites

you'll need take off the side cover. take off the oil pump, and water pump covers, remove impeller..then take off the clutch cover. then you'll have to take off the side cover.

just take your time, and it is fine. do a search, and you'll find pictures of this repair done. i've done this one twice, and it's not bad. make sure to replace the impeller shaft and both seals. also check the bearing while you have it apart. make sure to keep track of all your small o-rings.

Share this post


Link to post
Share on other sites
Thanks all.

Just remove the pump cover can replace the water & oil seal? My friend with a WR400 said that he need to remove the whole side cover. If that is true, I need to buy the gasket.

If you're careful when you take the sidecover off you can re-use the gasket. I did this on my bike a few months ago and its not hard at all.

Share this post


Link to post
Share on other sites

also maby a 2,8 i literally had to put it in a vise to separate it (and trashed the shaft (. i say clutch cover first bc u have 2 bolts hiding under it. if you forget to take them out "i see a pry bar comming" its easy just MAKE SURE THE SEAL FACES THE RIGHT DIRECTION

Share this post


Link to post
Share on other sites

I bought a NEW 07 WR two months ago and the coolant seal started seaping within two weeks. Yes it was still under the 30 day warranty but I very much prefer to do my own work as I know it's done right the first time.

All you need to do albertlui is remove the water pump, then remove the impeller and replace the seal. Be carefull to not lose the two locator dowels. It's a 20 minute job. I don't recall if the impeller had reverse threads but all you need to do is look at them to figure that out. Use a 3/8" impact to remove impeller. Check out the shaft for roughness or burrs and replace it if needed.

I believe my seal started leaking because it sat at a dealership for a year untill I rescued it. LOL

Share this post


Link to post
Share on other sites

hi... is it possible that the coolant will leak into the cylinder head from the cylinder resulting mixture of (engine oil+coolant) dripping out from the pipe breather?

should i remove the cylinder head and replace the gasket inbetween or tighten the nuts..

Share this post


Link to post
Share on other sites

WhaT ????????? :thumbsup::busted:

I think Yamaha is kind of sucking here. My water pump Just started leaking . The P.O.S only has 325 miles on it . I thought the new 4 strokes were tough . It turns out the thing that is tough is keeping up with all failures ....

Yamaha :goofy::D :D :D:busted::ride::lol::worthy:

I want My Cr 500 afc Dual sport done so I can ride a bike more then work on it.

Share this post


Link to post
Share on other sites
WhaT ????????? :banghead::busted:

I think Yamaha is kind of sucking here. My water pump Just started leaking . The P.O.S only has 325 miles on it . I thought the new 4 strokes were tough . It turns out the thing that is tough is keeping up with all failures ....

Yamaha :ride::crazy::eek::thumbsdn::D :D :busted::ride:

I want My Cr 500 afc Dual sport done so I can ride a bike more then work on it.

The water pump is a normal wear item. Some wear out faster than others, but sooner or later they all go. It isn't a big deal. The same thing applies with the starters. These are high performance 4-strokes which means they will require maintenance. If you want a bike that's as bulletproof as the Honda XR was, then buy an XR, but be prepared to be in the back of the pack. The trade off is performance. The air-filter-cage-hole thing was inexcusable, I'll grant you that. But the 5-valve design will outlast anything else out there in its class. All the little piccadillos that crop up from time to time are a minor trade off for everything else you get. The way I see it is you have a few choices: 1. Sack up and learn to wrench a little, 2. Pay someone to do it, 3. Sell the bike and get something lower on the food chain. Aside from bolt-on goodies, I didn't know diddley-squat about wrenching on bikes before I bought my WR. Now I'd say I'm pretty good with everything, and the learning process has been a kick along the way...SC

Share this post


Link to post
Share on other sites

Replace both, seals and shaft, I only changed the seals and the leak is still there, sometimes here in MX takes like a month to bring all the required parts.

Is better to wait for all the parts and do the job only one time.

Good luck.

Share this post


Link to post
Share on other sites

Grab your owners manual and a pint of beer and sit down and read how to do it first. Then head out to the garage with your metric wrenches and get started. Follow it to the letter and you will find that it is very simple. Make sure to use a torque wrench when puting it back together. If you don't have one, go buy one. It will make your wrenching a whole lot easier and safer. (easy to strip out the bolts when they only torque to 7 FT Lbs.) When you drain you coolant from the bottom bolt at the water pump cover, make sure to keep the rad cap on until you have a bucket ready. It will dribble out of the hole until the cap is removed and then it shoots straight out like a childs water gun.

Cheers

Chris.

Share this post


Link to post
Share on other sites

Yes it is no big deal to fix the leak .I put in two seals and the shaft . My issue is the fact that went bad with only 300 street miles . I think yamaha should make a ceramic pump seal and get rid of this issue. There is no excuse for such a cheap setup :banghead::busted::D

Share this post


Link to post
Share on other sites

Definitely the water pump seal. Mine just went out on my 07' WR450 with 95 hours on it. $30 for a new seal.

............. bahhh :banghead:

Share this post


Link to post
Share on other sites

I think I'm going to order more spare parts now .So next time I don't have to wait a week for parts

Share this post


Link to post
Share on other sites
I bought a NEW 07 WR two months ago and the coolant seal started seaping within two weeks. Yes it was still under the 30 day warranty but I very much prefer to do my own work as I know it's done right the first time.

All you need to do albertlui is remove the water pump, then remove the impeller and replace the seal. Be carefull to not lose the two locator dowels. It's a 20 minute job. I don't recall if the impeller had reverse threads but all you need to do is look at them to figure that out. Use a 3/8" impact to remove impeller. Check out the shaft for roughness or burrs and replace it if needed.

I believe my seal started leaking because it sat at a dealership for a year untill I rescued it. LOL

Yeah my 07 is weeping too. I've only got about 5 or 6 rides. Sounds like a small pattern here.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0