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[solved]water pump leak

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LI
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Solved water pump leak

Post by LI on Tue 30 Apr 2013, 9:53 pm

Guys, I need a bit of advice.

I have coolant leaking from what I think is the drainage hole on the underside of the water pump. According to Haynes 'if the drainage hole shows signs of leakage the pump must be removed and renewed'.

Looking on Lings link to lings part diagram it looks like I have to buy the whole thing - part number 19200-MY5-603 - which is £128!

Is that right or is their a cheaper solution?

cheers,
Li
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eternally_troubled
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Solved Re: [solved]water pump leak

Post by eternally_troubled on Wed 01 May 2013, 3:46 pm

I don't know if there is a better way. If you see water coming out of that hole I believe it means that the water pump seals are failing and they aren't replaceable (which seems odd) hence the replacement of the whole unit.
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LI
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Solved Re: [solved]water pump leak

Post by LI on Wed 01 May 2013, 3:50 pm

Yes from everything I've read online it looks like that the coolant side is a mechanical seal where as the oil seal is an o-ring.

Is Lings the cheapest place for this sort of part?

cheers,
li
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eternally_troubled
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Solved Re: [solved]water pump leak

Post by eternally_troubled on Wed 01 May 2013, 4:37 pm

No, lings are not always cheapest - try David Silver:

http://www.davidsilverspares.co.uk/

and have a word with your local garage and/or Honda dealer to see if they can order the parts cheaper.
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LI
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Solved Re: [solved]water pump leak

Post by LI on Thu 02 May 2013, 11:30 am

Local dealer had the best price including delivery.

I didn't realise the drain hole between the water and oil side of the pump was up behind the main pump body. I'm now not sure if the coolant was leaking from there, especially as the mechanism does not appear at all worn. So I've ordered a new gasket and o-ring £10.28 and am going to try that first before I shell out £134 on a replacement pump.

At least extracting the pump is straightforward, just the four bolts you can see. The hassle is having to drain the coolant system which means seat, panels and tank off.

BTW. Anyone attempting this make sure you have a good sized bucket to catch the coolant and oil when you pull the pump out. There's quite a lot still in the pipes even after you drain it.

I'll keep this thread up to date with progress for other folk with this issue in the future.
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eternally_troubled
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Solved Re: [solved]water pump leak

Post by eternally_troubled on Thu 02 May 2013, 1:05 pm

Yes, definitely a good idea to try the easyest/cheapest solution first.

That whole part of my bike is a nice mess of aluminium corrosion and flaking paint... hopefully not something I need to investigate soon!
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LI
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Solved Re: [solved]water pump leak

Post by LI on Wed 29 May 2013, 12:11 pm

Bought a new water pump, £130 inc postage from my local dealer.

Emptied and flushed the cooling system.

Disconnected old pipes from the pump. Removed front sprocket cover and top and bottom bolts on pump body (as they're the ones that hold it to the engine). These bolts don't come with the new pump, so have to be reused. And slide out.

Put a bit of clean engine oil on the oil side o-ring and make sure the pump is slotted onto the oil pump when pushing it in. Bolt on (only low torque on these 12 ish).

Reconnect pipes. Put sprocket cover back on and refill the cooling system.

Piece of cake.
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LI
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Solved Re: [solved]water pump leak

Post by LI on Wed 29 May 2013, 12:12 pm

Sorted. Thanks ET.
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eternally_troubled
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Solved Re: [solved]water pump leak

Post by eternally_troubled on Wed 29 May 2013, 12:33 pm

Nice to hear it wasn't too bad... (apart from the 134 quid!)
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teamster1975
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Solved Re: [solved]water pump leak

Post by teamster1975 on Wed 29 May 2013, 12:57 pm

Well done Li Smile
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LI
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Solved 3 years?

Post by LI on Sat 23 Apr 2016, 3:00 pm

The pump seal seems to have gone again after only three years (almost to the day).  I've only done 2700 miles in that time.  Could the problem be the bike not getting enough use?  It was an OEM part so I would expected it to last longer than that.  Any ideas?
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ANDYC
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Solved Re: [solved]water pump leak

Post by ANDYC on Sat 23 Apr 2016, 6:42 pm

That seems strange, I had until now never heard of a water pump failing on one of these.
I have done 250k on the same water pump and had no probs with it.

Are you sure that its from the lower drainage hole, water and oil will always appear to be coming from the lowest point on an engine.
Block up the drain hole and see if the leak persists. The small hose to the carbs is just a push on fit and I have had issues with that one, where the spigot that it fits onto has corroded and not sealed well.
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LI
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Solved Re: [solved]water pump leak

Post by LI on Sat 23 Apr 2016, 8:07 pm

Thanks, I'll double check, but I'm pretty sure its coming from the small gap between the two halves of the pump body.
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eternally_troubled
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Solved Re: [solved]water pump leak

Post by eternally_troubled on Mon 25 Apr 2016, 4:02 pm

What a pain! I really hope it isn't that again...
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geoffnorfolk
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Solved Re: [solved]water pump leak

Post by geoffnorfolk on Mon 25 Apr 2016, 10:54 pm

I wonder if it's anything to do with the coolant you're using. On my NTV650 which has a similar pump, you must use silicate free coolant to prevent wear on the seal. Don't know if that's the case with the CB500 though.

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