Bunging up a blowhole

[Rik ShawParticipant @rikshaw]

I have just finished machining a gunmetal casting for my engine and right on the final cut a 1/16" dia blowhole has been revealed. I am not keen to heat it so silver solder as a filler is not an option.

Any ideas? Bronze coloured JB weld would be ideal if it was available.

Rik

[Rik ShawParticipant @rikshaw]

[Brian WoodParticipant @brianwood45127]

Hello Rik

If you have some or can still make some filings of the material to mix as a filler into epoxy resin and by making a rather fluid mix, I think you should be able to plug a hole of that size by dabbling it in with a pin or similar and then helping it set with some gentle heat.

I am assuming this is a cosmetic repair and not required to stand up to pressure. I have made similar repairs in cast iron with fillers using filings from the casting.

Regards

Brian

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