Crud catcher bolts

Had some seized stainless bolts that secured the crud catcher which snapped their heads removed by an engineering shop. The threads whilst still present are now a little slack and won’t tighten with much pressure on them, not enough to stop them coming loose anyway.

Thinking of helicoiling them- anyone else had to do this? Just making sure there is enough meat in the thread holes to be able to drill the size required to insert the helicoil.


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Helicoil will be fine , just don`t increase the depth of the holes, you may need to grind the tip of the tap down if you don`t have a plug tap to suit the helicoil.
Also you may need to trim the insert to the correct length.
This is a common problem, I have done loads.

Use a slightly longer bolt with a nut behind securing it.