Maintenance & Technical > KX500 Original

Why does my head continue to weep coolant through the studs

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2001KX5:
Well after having my cylinder decked to clean the surface and after getting heli coils put in the threads for the head studs I continue to get some weeping of coolant around some of the head studs.

I'm just wondering if any of you guys had this issue and if you think the cyl. head to frame mount could cause this?

hughes:
You had the cylinder decked but what about the surface of the head?? Is the coolant leaking between the head and cylinder or is it leaking around the  cylinder head nuts that bolts the head down? What gaskets are you using?

2001KX5:
Yeah its weeping up through the head studs. I also took one nut off last night and the head stud was actually loose so I can to finger tighten it before I torqued the nut back down.

I never had the head re-surfaced but it was sent to eric gorr with my cylinder plus I checked the surface and its true, plus I ran it over some 1800 grit sand paper on a flat surface before I put it on the last time.

So last night I screwed all the head nuts down until they were fully bottomed and then torqued the whole works down to 22 ft/lbs.

Not sure what impact heli coils have on torque specs, i.e. more than stock needed.   There is no reason in god name for this to be happening. I guess no one else has ever had this problem hey.

I'm using oem kawi head gaskets.  And I always have a backup in my took box.  I'm also using copper spray on the gaskets for extra insurance.

hughes:
You may need to loctite the studs and use a stud runner to torque them down with. If the studs keep coming loose that's the problem with the coolant leak you loose the clamping force from the nut when the studs back off.

5dracing:
Just a thought as I read this, check to see that the helicoil is not backing out. If it is sticking up the head may not make proper contact with the cylinder surface allowing seepage.

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