Question about 2006 Yamaha XT 660 R

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Water pump problems on 660 grizzly

06 660 Yamaha grizzly. Water pump is blowing antifreeze out of a hose on the hosing. The hose is connected to the housing behind where the mechanical seal is located. I was told that I needed to replace that seal so I replaced the mechanical seal and oil seal in the pump. After "rebuilding" the pump I drove my bike for 5 mins and it did the same thing again... Why? What else could it be?

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If it's the bottom hose,its really easy to get hole at bottom from going over logs n stuff? Checkhose better,if needed cutoff an inch, and clamp back on. If it washead

Posted on Apr 22, 2011

  • Clint Hemsworth Apr 22, 2011

    If it was headgasket leak from compression, it would leak out overflow, through radiator cap, that is designed to -be- the "weak point".

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Hi,if you have done all that and it still does it then it is not the problem,it sounds to me like the cooling system is pressurizing,and about the only thing that will do that is a leaking cylinder head gasket,i cant remember what the specs are,check with a yamaha dealer to find the correct psi reading for the cylinder when it is on the compression stroke,from memory should be btween 120-140 psi,but check first,then do a compression test,if the reading is say more than 10%below manufacturers specs then that will more than likely be the cause,,water will find the easiest path seals and hoses are the weak points in the system and thats where it will find its way out,hope this helps...cheers

Posted on May 03, 2010

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