joneh
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| posted on 28/3/19 at 10:06 AM |
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Thread repair
Morning all,
I have a stripped engine mount thread on a crossflow block. Only noticed it after finishing the rebuild - rookie mistake.
Whats the best method of fixing this, being cast iron? I'm thinking an m8 tap as its slightly bigger than 5/16 UNC? The bolt spins freely so I
assume I can't use an original size tap. If that doesn't work can I helicoil it by hand?
Jon
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rusty nuts
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| posted on 28/3/19 at 10:47 AM |
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Personally I would get a Helicoil repair kit and do a proper job. You never know , you may need it again . Failing that find someone with one? I’ve
lost count of the times incorrect fittings have caused me problems.
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joneh
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| posted on 28/3/19 at 11:10 AM |
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quote:
Originally posted by rusty nuts
Personally I would get a Helicoil repair kit and do a proper job. You never know , you may need it again . Failing that find someone with one? I’ve
lost count of the times incorrect fittings have caused me problems.
Sounds the right approach. Is that easy to do by hand into cast iron?
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MikeRJ
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| posted on 28/3/19 at 12:22 PM |
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quote:
Originally posted by joneh
quote:
Originally posted by rusty nuts
Personally I would get a Helicoil repair kit and do a proper job. You never know , you may need it again . Failing that find someone with one? I’ve
lost count of the times incorrect fittings have caused me problems.
Sounds the right approach. Is that easy to do by hand into cast iron?
If you can drill a hole straight and start a tap straight then it's a piece of cake.
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rusty nuts
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| posted on 28/3/19 at 01:08 PM |
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As Mike says really, only thing I would add is use plenty of lube when drilling and tapping. Drilling and tapping fluid from Toolstation is cheap
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steve m
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| posted on 28/3/19 at 04:26 PM |
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I helicoiled all my crossflow mounts to 8mm, as the old 5/16th threads were manky
helicoil kits are easy to use, and once bought, used them loads of times
steve
Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at
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907
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| posted on 28/3/19 at 07:54 PM |
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I would drill it out to 8.5 mm and tap M10. Drill the mount 10.5 mm
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joneh
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| posted on 28/3/19 at 10:02 PM |
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Thanks all, the hole is pretty beat up, so might have to go to 3/8 unc or m10. Will take a look tomorrow.
Jon
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