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Discussion Starter #1
Hi All

I have a 2007 SM 610 that started leaking out of that small hose at the top of the left radiator. It was just the factory clip and I replaced it with a new hose clamp.

While I was replacing the clip I thought it a good idea to drain and replace the coolant. I drained the system by removing the bolt on the right hand side of the cylinder, and filled it up with new coolant.

All seemed good, except now when I ride hard the overflow reservoir fills up and sprays out the reservoir cap. It is so frustrating..... the coolant level when the bike is cold is just below the indicated line so I am not sure whats up.

Do you guys have any ideas? Do I have air somewhere in the loop?

Your input will be greatly appreciated.
 

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Discussion Starter #2
So, I have been doing some reading. I didn't mix the coolant with de-mineralised water. I just used it straight. I have a suspicion this is my problem.

I have now done a 50/50 mix and will test in the morning.
 

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since this problem popped up after you fiddled with the coolant I'm gonne asume it's not a defective radiator cap or leaking head gasket, 2 problems which can also cause the radiator to expel coolant without the actual need to do so.

make sure the level is ok and if the circuit requires bleeding make sure that's done. most bikes where the waterpump is located on the head require bleeding so if you haven't done that, chances are that's your problem. bleed it if required, then check the level again and top off if required.

the overflow reservoir near the motor is not where you determine the coolant level, figured I'd mention that because some people have made that mistake in the past. I know there's a minimum level indication on there but technically no coolant needs to be in there. it is what the name says and that's simply an overflow tank.

to read the coolant level you need to take the cap off the radiator and make sure the coolant is just over half a cm above the coils. if you overfill it, the bike will burp coolant and that will run down to your overflow reservoir.
 

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Discussion Starter #5
Thanks for all your responses. I changed the coolant to a 40/60 mix with deminerised water, it helped a bit but I am still getting overflow when I'm riding hard.

I then turned my attention to the radiator cap and this is what I found:

http://i126.photobucket.com/albums/p94/MrSinisterX/tn_RadiatorCapUnderside.jpg

As you can see there appears to be some damage to the seal on the lip

Here is a picture of the top of the cap, I was under the impression that Husqvarnas dont take Japanese Radiator Caps but this would appear to be exactly what it is.

http://i126.photobucket.com/albums/p94/MrSinisterX/tn_RadiatorCapTop.jpg

I replaced this cap with a 1.4 bar unit that I got from a local dealer it looks just like the old one, it was way more snug and appears to fit nicely.

I will let you know how it goes when I go for a ride tomorrow.

Sorry for the photobucket links, for some reason the forum wouldnt let me post pictures even though I formatted them to the correct size.
 

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Discussion Starter #6
Well, the new radiator cap appears to have solved my issue.

I have used the SM to work and back the past two days with no resevoir overflow, even though the resevoir level does raise about an inch or so when hot. When I turn off the engine the coolant flows back to the engine in about 5 minutes or so and I can hear the liquid moving in the motor for about a minute after. This is normal right?
 

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Discussion Starter #7
Well.. on my way home from work this evening I had coolant spraying what looks to be out the resevoir overflow again. It was dark so I couldnt really see, but the residual spray pattern certainly looked like it when I inspected at home.

So what I'm thinking is the following:

Blown Head Gasket? (No water in the oil or discolouration in the coolant though)

Wrong Radiator Cap?

Air in the system somehow?

Faulty Water Pump?

Blocked Pipes?
 

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Discussion Starter #8
Well guys, I believe I have found the source of all my troubles.

Water Pump Impeller......

Looks like the nut that holds the impeller onto the shaft came loose, causing play on the impeller which eventually sheared its key. Luckyly the impeller is aluminium and the shaft apears to be undamaged.

Here is the shaft, look at the scoring on the head from the loose impeller:
http://i126.photobucket.com/albums/p94/MrSinisterX/tn_Water_Pump_Shaft.jpg

Here is the back and front of the impeller, you can see how it has sheared:
http://i126.photobucket.com/albums/p94/MrSinisterX/tn_Impeller_bottom.jpg
http://i126.photobucket.com/albums/p94/MrSinisterX/tn_Impeller_top.jpg

Well now I guess I need to call the Husky dealer and order a new impeller, and maybe lock-tite that nut on there.

Will this be the end of my troubles... I certainly hope so.
 

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This is not the first time I have heard about this happening. That should be the problem, I would think.

Good luck, Gutzy
 

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Discussion Starter #10
Well my new impeller finally arrived, apparently it wasn't released from the local husky dealers "system" until I called to ask if it had arrived or not. I then had to wait another few days

But I am happy to report that this was in-fact my trouble and the SM is alive once more, with no coolant spraying all over the place any more... jeez I hate that smell now :)

Here is a picture of the new impeller, you can see the key all shiny and new

http://i126.photobucket.com/albums/p94/MrSinisterX/P1000950.jpg
http://i126.photobucket.com/albums/p94/MrSinisterX/P1000951.jpg

I applied some loc-tite, but I also had to replace the nut as it was stripped

http://i126.photobucket.com/albums/p94/MrSinisterX/P1000960.jpg

I had to replace the water-pump gasket as it was very brittle, and I took advantage of the downtime to change the the oil, clean the bag filters, change the oil-filter and check the tightness of the main crank nut.
 
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