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General Category => General Discussion => Topic started by: amamet on November 11, 2015, 01:11:58 PM

Title: what length helicoil for stripped valve cover holes, 78 g5
Post by: amamet on November 11, 2015, 01:11:58 PM

i have a bout 5 stripped valve cover holes in the heads of my 78 g5 that I'm finally going to address.  (got it this way).  i have the heads removed and was wondering what length i should order.  local shop asked me, 6mm x ?
thx
allen

Title: Re: what length helicoil for stripped valve cover holes, 78 g5
Post by: Tom on November 11, 2015, 01:46:03 PM

This is a lousy answer.  I used what matched up to the bolts or close to it.  I got a Heli-coil kit from NAPA and used it on my LM III. 

Title: Re: what length helicoil for stripped valve cover holes, 78 g5
Post by: flangeman_70 on November 11, 2015, 01:56:41 PM

6x10mm is good.
Iv'e done all mine on my SPIII

Adam

Title: Re: what length helicoil for stripped valve cover holes, 78 g5
Post by: Wayne Orwig on November 11, 2015, 01:57:34 PM

I bought a kit from NAPA, # 770-3091. There is no mention of length. It is of course a M6x1 and needs a 0.250 inch drill bit.
The package with the HeliCoils themselves, inside the kit, is labeled M6x1 9.0 length.
I have used those on a number of valve covers and sumps. A little longer would not be a problem.

Title: Re: what length helicoil for stripped valve cover holes, 78 g5
Post by: amamet on November 11, 2015, 05:18:02 PM

should i be getting the self locking helicoil?  what locks the standard helical in place and keeps it from coming out upon disassembly?   sorry, never used them before
thx
allen

Title: Re: what length helicoil for stripped valve cover holes, 78 g5
Post by: twhitaker on November 11, 2015, 07:31:42 PM

In its free state, the helicoil is a bit larger in diameter than the hole. Once threaded in, that 'spring force' holds it in place.