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Leak near thermostat

 
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Old 03 May 2012, 12:58 pm
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Default Leak near thermostat

I've done a head gasket replacement and have issues with water pump, thermostat, etc... in the past, so there have been several times that I've had to remove the radiator filler neck. In doing that repeatedly, I must have over tightened the two bolts that mount the filler neck to the aluminum flange on the head, and I've stripped the holes out. I'm worried about tapping the aluminum to accept larger bolts. I don't think the tap will go deep enough to thread the new bolts all the way in and if I drill deeper I could cause a head leak, or worse. Has anyone had to do this before? Any advice?

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Old 03 May 2012, 01:26 pm
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Default Re: Leak near thermostat

Definitely over torking these. Are both holes stripped? The only one to worry with is the one next to the head. It's the only one that can penetrate the water jacket.
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Old 03 May 2012, 01:54 pm
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Default Re: Leak near thermostat

You can drill them out and use a heli coil kit to re tap them to the stock bolts.
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Old 03 May 2012, 03:17 pm
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Default Re: Leak near thermostat

If you can get a solid hold after taping for the bigger bolt use washers to make up for the gap that you've created by not going very deep
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Old 05 May 2012, 11:13 pm
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Default Re: Leak near thermostat

Quote:
Originally Posted by fabreezai View Post
You can drill them out and use a heli coil kit to re tap them to the stock bolts.
QFT,

Plenty of room, you're at 8mm (5/16") so 10 would be huge.
when a bolt goes into aluminum, put a drop of motor oil etc on it.
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