SOHC.co.uk Forums > CB350/400

Helicoils pulled out, replace or go size up?

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Matt_Harrington:
Maybe some new inserts with a little loctite 2620? It is certainly worth trying before anything more remedial.
Matt

Bryanj:
I wouls advise buying a helicoil kit and carefully retaping with the special tap then measuring carefully the depth of helicoil thread in the head and buying correct length coils, they come in 1d, 2d, 3d, etc where d is the diameter of the bolt. If necessary get a longer one than hole is deen and after fitting coil use a square or triangular needle file to cut the coil just below head surface

Trigger:
Get yourself a V-coil kit and re-tap and put a new coil in >>> Link >> https://www.ebay.co.uk/itm/354074603431?hash=item52707dafa7:g:jqIAAOSw3qpimPFJ

Seabeowner:

--- Quote from: billdn on June 06, 2022, 10:24:48 PM ---While torquing up the 4 bolts on cam cover, 3 wouldn't tighten.

--- End quote ---
That sounds ominously like the screw is slipping in the coil insert or the coil is slipping in the hole. So get the longest insert you can, they come in 1/2 d lengths as well. Difficult to judge as the insert comes tightly coiled (wind it on a screw, it should be the 6mm/9mm etc).  Also see if a fractionally longer screw can be fitted, but be careful.

billdn:

--- Quote from: Trigger on June 07, 2022, 12:12:21 PM ---Get yourself a V-coil kit and re-tap and put a new coil in >>> Link >> https://www.ebay.co.uk/itm/354074603431?hash=item52707dafa7:g:jqIAAOSw3qpimPFJ

--- End quote ---
Thanks Trigger!
I have a helicoil kit but not the one you mention. I'm  guessing over the years experience has shown that this to be the better , more durable and precise tool ?

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