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#1
09-09-2006, 08:45 PM
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Stripped threads help
One of my 300E's has a stripped 10mm x 1.0 coolant bleed screw on top of cylinder head, and I need to fix it.
Will a heli coil hold up to the pressure of the cooling system or should I just tap it to 12mm and use a new 12mm bolt? 
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#2
09-10-2006, 08:42 AM
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I'd go with the oversize. The helicoil I don't think would pop out under pressure, but might leak, why take the chance if you have room to go oversize?
Gilly
__________________
Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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#3
09-10-2006, 10:59 AM
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Keensert
I would put a Keensert in it. This will give you the original size thread and will not leak. Provided there is enough material to install the Keensert.
__________________
Gary 1973 450SL 1999 Silverado 4X4 Ext Cab 1999 Mercury Sable 1972 450SL Parts car Previously owned keepers: 1967 MGCGT - 3L-6 1972 Mustang Fastback - 351C Current Cylinder Index: 37
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#4
09-10-2006, 01:30 PM
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I thought about this all night and decided to tap the hole to 12mm. The keensert looks great but I don't think there is enough room to countersink it. The tread depth is only about 10/15mm so I wouldn't want to take away any strength.
Thanks for the input. A lot has been going on here and I couldn't think straight. I didn't even think about the helicoil leaking - Doouuuhhh! Last edited by BENZOMANIAC; 09-10-2006 at 04:19 PM.
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#5
09-10-2006, 05:09 PM
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You could always use a sealant on the helicoil threads, but if it's just a plug, why mess with it, y'know.
Gilly
__________________
Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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