ec300 (2007 kick) Water Pump

R

RiverRight

New member
I have a problem whereby engine makes an intermittent screech (becoming more frequent) and coolant spits from the overflow (but doesnt/hasnt boiled, yet).

I do believe its the water pump. Also I have an aluminium impeller waiting for just such a time when I have to pull it down.

My question is:- are there any gaskets, rings etc that I really should replace while I've got it down, and is there a kit which contains such things?

Any tips or tricks as to the method/procedure ?
 
Silly question I know. Perhaps its all been dealt with a thousand times before.
Dont seem to be able to find it with search though.
Does anybody care to point me in the right direction?
 
Old man rivero! Sorry no one has replied to your post in here. Hopefully someone will chime in soon with some experience.

I'd be looking at the exploded view and seeing whats in there. You first really need to identify where the screech is coming from pump wise. Is it the shaft in bearing for the shaft? You'll have to pull the seal to get access to this so I'd look at minimum, new gasket, new seal, and a new bearing in the event that its shot. There isn't a whole lot more to the water pump than that (a shaft, a washer, impeller, retaining clip, and drive gear).

I'm not 100% sure if you'll be able to change the parts out without removing the complete RHS engine case. Ie I have no idea at all :) Call Scottys dirtbikespares and hit them up. Shouldnt cost much at all.
 
Does the screech happen when your clutching? Just wondering because a lot of our bikes clutches make aweful screeches from the clutch when you get them worked up and if there was overflow coolant in the tank I'd guess the bike was hot which is when you'll get this annoying screeching from the clutch basket design
 
I've never heard of the pump causing a noise like this. Even my '12 that was rubbing the cover. I tend to think its a coincidence, maybe clutch slipping like Trevor noted, or something starting to seize internally. It could spit coolant from being overfilled, or from a bad head oring causing the system to be pressurized from cylinder pressure without being hot. What does your trans oil and coolant look like? In any case, you need to pull the side cover to properly inspect everything and change the impeller. I guarantee that the impeller bolt will be frozen it the shaft threads on an '07 bike, and will require the rear of the shaft to be held in a vise to extract. The '07 had a good clutch basket, at least mine did. If thats squealing I'd check the plates for spec thickness and glazing. PM me your email address if you need an engine manual.
 
Its usually the clutch making that noise and changing the oil will make it go away.
 
Jakobi said:
Old man rivero! Sorry no one has replied to your post in here. Hopefully someone will chime in soon with some experience.
I'd be looking at the exploded view and seeing whats in there. You first really need to identify where the screech is coming from pump wise. Is it the shaft in bearing for the shaft? You'll have to pull the seal to get access to this so I'd look at minimum, new gasket, new seal, and a new bearing in the event that its shot. There isn't a whole lot more to the water pump than that (a shaft, a washer, impeller, retaining clip, and drive gear).
I'm not 100% sure if you'll be able to change the parts out without removing the complete RHS engine case. Ie I have no idea at all :) Call Scottys dirtbikespares and hit them up. Shouldnt cost much at all.
Click to expand...
Thanks Jake. Parts as suggested plus impeller bolt on order from Scotty now.
Thanks for the advice everyone - much appreciated.
I'll keep you advised.
 
My trusted mechanic, Simon Jobson, rode the bike today and said he is one hundred percent certain the noise emanates from a bearing and ninety five percent certain its the water pump impeller shaft bearing thats gone, taking the seal with it. The appropriate parts are already on their way, so possibly tomorrow, maybe Monday we move on. I'll drop the fluids now and see if there is any cross contamination.
 
Which bearing? I had the water pump bearing that's pressed into the case go on me and it tanked my engine from the bearings spilling out. If that bearing went I don't know how your bike would still be running?
 
I agree. Thats a small bearing for a prolonged "screech". I would think it would self destruct or seize in short order, taking the pump drive gear out as has happened before.
 
nambo-trev said:
Which bearing? I had the water pump bearing that's pressed into the case go on me and it tanked my engine from the bearings spilling out. If that bearing went I don't know how your bike would still be running?
Click to expand...
GMP said:
I agree. Thats a small bearing for a prolonged "screech". I would think it would self destruct or seize in short order, taking the pump drive gear out as has happened before.
Click to expand...
Well all I can say is watch this space. Coupla days.
I take your misgivings very seriously, but I feel the water pump has gotta be eliminated first.
 
Water Pump Eliminated

Water pump was nowhere near as bad as I suspected, seal intact, no chewed bits. Bearing had a little play, which converted to some movement of the shaft. It was theorised that this may have caused some slippage in the plastic gears that drive the impeller. Anyway, all back together, screech still there.

It has now been conclusively traced to the, wait for it ....... back brake, and can be fairly reliably reproduced with application of said brake.
Pads have plenty of meat, but I can now feel a change in braking performance when the screech occurs. I've had the rear wheel off a few times lately, so I'll recheck that everything is installed properly and aligned. I'll order some new pads too.
 
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