HELP,coolant commning out of overflow - Grizzly Riders - Yamaha Grizzly ATV Forum

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post #1 of 11 (permalink) Old 06-18-2011, 03:54 PM Thread Starter
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HELP,coolant commning out of overflow

help plz ive got coolant comming out of my overflow at higher rpm like its overheating replaced thermostat didnt help a bit radiator is clean and free of debrea thinkin maybe its the water pump is there a way to check and see if its workin and if thats the problem can i rebuild it or just buy a new one?
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post #2 of 11 (permalink) Old 06-18-2011, 04:55 PM
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Take the water pump cover off and check if all the fins are on the fan thingy and also might wanna try flushing out the system.

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post #3 of 11 (permalink) Old 06-18-2011, 04:59 PM
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I doubt the issue you describe could be blamed on the water pump IMO...

Does it start to spit water immediately after start up (at higher rpm's), or does it need to run a while before it does it?

Have you replaced your radiator cap yet?

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post #4 of 11 (permalink) Old 06-18-2011, 05:05 PM
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sounds like it is air locked.

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post #5 of 11 (permalink) Old 06-18-2011, 05:27 PM
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We need more info on your atv, what grizz/miles ect. Typically to be spitting coolant means a over pressurization of the cooling system which could be a head gasket. Take the radiator cap off and let the grizz idle, rev it a little, do you see any bubbles? Bubbles would indicate that the cylinder is bleeding pressure into the cooling system.


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post #6 of 11 (permalink) Old 06-18-2011, 05:35 PM Thread Starter
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checked water pump impeller is working fine and in good shape,its an 02 grizzly 660 1800 miles 208 hours and ill have to put it back together and look for bubbles,but before it only did it at higher rpm and i have not replaced the cap yet
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post #7 of 11 (permalink) Old 06-18-2011, 05:49 PM
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Sounds like bad head gasket, but it could be the cap, just take off you cap and go to your local parts store as its a common style. I believe a 16 PSI cap is what you need.

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post #8 of 11 (permalink) Old 06-18-2011, 08:56 PM Thread Starter
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ok guys back together didnt see any bubbles in radiator,and after relooking the coolant is comming out of the top hose of the resovoir alot of pressure shooting it out at higher rpm none comes out at lower rpm's any more ideas?
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post #9 of 11 (permalink) Old 06-18-2011, 09:35 PM
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Sounding more like a bad head gasket to me


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post #10 of 11 (permalink) Old 06-18-2011, 09:51 PM Thread Starter
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ok must be a head gasket i just found little oil drops floating in my coolant not much but assumming that could also mean head gasket? anyone know of any sites with step by step intructions on how to replace headgasket i seen on here a step by step with pics on how to flush coolant very nice and easy thanx all for your info
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