<VV> Stripped plug hole

[Hugo Miller]

Are you going to attempt this in situ? A 7/16 drill is going to kick 
out a heck of a lot of swarf - how are you going to contain it? A more 
permanent solution would be to pull the head off & get it welded & 
re-tapped? I've often found that you can spend more time faffing about 
with shortcuts than it takes to do the job properly from the get-go. In 
my opinion it would have been better to have all the threads helicoiled 
or fitted with steel inserts from new. That would be a permanent 
solution. These heads must all have had the plugs taken out & re-fitted 
(and probably over-tightened) dozens of times over the last 50-60 years, 
so many of them are bound to be worn and/or weakened.

On 2020-01-18 03:46, Smitty via VirtualVairs wrote:
> It’s been a few days since I raised the subject, so here’s an update.
> Just as a reminder, the hole I have was repaired with what appears to
> be a KD insert which failed and pulled out.  Next a repair was
> attempted using what appears to be a BigSert.  It also pulled out.
> Not condemning anyone or any product.   it just is what it is.  So
> doing some research on line I find there are many types of repair
> inserts for huge holes.  BigSert being my repair of choice I quickly
> found out that wasn’t going to happen.  Price for a set of tools and
> an insert was between $600 and $900.  I finally hooked up with the
> Thread kits Company in California.  Talked to a gent named Gene on 
> the
> phone, who took the time to discuss the problem and offered several
> options.  I chose to use the EasyLock insert at a cost of around $10 
> .
> The big drawback for some folks would be the tools to prepare the
> hole.  In my case a 7/16 drill would be required (not cheap), and a
> 3/4 x 16 tap (not cheap) .  Just happened to have those.  I ordered
> the inserts today.
> I’m not one who gives testimonials easily but I just had to give an
> attaboy for Gene and the help he gave me on this project.   Smitty
>
> Sent from my iPad
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