2010 EC 300 Water pump shaft snapped & bearing collapsed

J

justsam

New member
Half way through an Enduro yesterday I crashed whilst flat out up a gnarly hill. The bike fell gently on its right and immediately started rattling/knocking. I presumed it had moved the front pipe but it was not that and something terminal. End of my effort at the Dogs of WOR :(
On inspection I removed the right side engine and found the the water pump shaft snapped and the bearing in the crankcase totally collapsed, even the outer shell of the bearing was hanging out! So not as terminal as thought but still abit of a mess. Should be a reasonably inexpensive and easy fix.
My concern is why or how has this happened as I presume there's minimal load on this drive? Are they prone? Could the bearing of collapsed causing the shaft to snap?...
Any experience shared would be really appreciated :)
 
This has happened before. Tough to draw conclusion what failed first, but my bet is the shaft. Inspect your impeller, any indication of it contacting the pump cover? Very poor control of tolerance in this area and a plastic part that has failed in the past.
 
Cheers Glenn.
Just inspected the cover and yes, it has been rubbing so it may have been just that. I'll get the parts ordered up and see how it looks reassembling.
 
2010, just a heads up. if any of those bearings got loose, and you need new gears - you will need a complete set. they changed manufacturers in 2011 and the new parts will not fit the old ones. I have a thread out there detailing my 4 month ordeal. GasGas did eventually step up once we figured out what the issue was (they didn't update part numbers). If you just dinged the bearing - go buy a freaking lotto ticket!!!!
 
Do a search of my threads I've started. I had my engine go because of the pump bearing in the case let go and tanked the bike
 
Yes, make sure all parts are accounted for. That pump problem is a disgrace. What I did was get a checkpoint alloy impeller, and took about .5 mm off the back so it would clear the cover adequately. Was the plastic impeller melted or distorted? Maybe some extra heat from the hill climb caused it to expand and rub harder, increasing load. Add a weak shaft to the mix and snap!


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I can see where my plastic impeller has contacted the cover from when the dealer did some work once and just used yamabond instead of a gasket :rolleyes:

I switched it out for a gasket again and kept running the plastic impeller. Will be replacing with a checkpoint during my current rebuild and doing what Glenn did to ensure clearance.
 
Would the impeller be this one :

http://checkpointoff-road.com/store.html

5003.jpg


Anyone knows were I can find it in EU ?
 
Thats the aftermarket one I'll be fitting. Checkpoint will ship internationally. I got one sent to Australia. Pretty sure postage was reasonable (both time and cost).
 
Just don't slap this in and think all is well, it may not be. The pump covers as of late are sloppy in their finishing. I got a warranty replacement for mine that looked better but still had problems. Perhaps it was something else in the stack like the shaft or side cover. Temporarily install the impeller, the cover, and check clearance. Mine hit and needed to be releived. Use clay between the impeller and cover for a reasonable estimation. Around .5 mm should be good, its not that critical especially with the new impeller. Set this up right and you should have no more problems.
 
GMP said:
Just don't slap this in and think all is well, it may not be. The pump covers as of late are sloppy in their finishing. I got a warranty replacement for mine that looked better but still had problems. Perhaps it was something else in the stack like the shaft or side cover. Temporarily install the impeller, the cover, and check clearance. Mine hit and needed to be releived. Use clay between the impeller and cover for a reasonable estimation. Around .5 mm should be good, its not that critical especially with the new impeller. Set this up right and you should have no more problems.
Click to expand...

That's good input, thanks. Can the impeller be replaced just by taking out it's cover or is it necessary to remove the entire left side cover ?
 
Pics attached hopefully?

You can see where its been rubbing about 50% of the inner cover...
 

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I prefer to take the side cover off and fit it on the bench, that way you can turn the pump shaft from behind and be sure all is free. Also, its better to hold the end of the pump shaft in a soft jaw vise while breaking the impeller bolt free. Its a steel shaft and somtimes the bolts are rusted slightly.

justsam,

That is not neccessarily rub marks from the impeller, it is the sloppy machine work on the cover, beleive it or not. Old ones were never like this. Look at the edges of your impeller blades, if you see dark lines and/or imbedded aluminum, its been making contact.
 
Same thing happened to me but it really did a number on the internals. Same story though. Uphill climb gentle lay over on the right side and whamo! This was on an 06 motor
 
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