<VV> Stuck valve cover bolt.

BBRT chsadek at comcast.net
Thu Feb 8 22:13:03 EST 2018

IF you have really boogered up this thing, and you cannot drill it out.. Why
not? Normally a 1/2-20 is pretty soft, unless you stuck a Grade 8 in there.
I am trying to understand how the head broke off. Over tighten? Too long and
it bottomed out over tightened? Previous person could have caused bolt to be
near failing.. That size bolt doesn't take much to turn it off.  
Anyway, if all else fails, take it to a machine shop.  Yes, remove the head
and ask them to fix it.   Use a vertical mill and cut out bolt remainder.
Depending on damage, use a helicoil or thin sert or even a thick sert..
Or.... a machine shop can drill a bigger hole, insert a rod of aluminum, fix
it in place, then drill and tap. You can do this at home as well, IF you can
get the old one out.
Good Luck
Chuck S

-----Original Message-----
From: VirtualVairs [mailto:virtualvairs-bounces at corvair.org] On Behalf Of
Matt Nall via VirtualVairs
Sent: Thursday, February 8, 2018 9:45 PM
To: virtualvairs at corvair.org
Subject: Re: <VV> Stuck valve cover bolt.

-----Original Message-----
From: Ignacio Valdes

Hi, The head broke off on this valve cover bolt. I've tried multiple ways
of getting it out drilling, weld a nut on,easy outs, without success.
Professional local shops in Houston Texas I tried are passing on this
because too old, still on the car, don't want to mess with it, etc.  Any
advice is appreciated.

Also, what is the preferred tool for holding the rocker stud from spinning
when you take the rocker arm nut off?


Keep drilling.. your only choice now...

Stud backing  out with Rocker nut is common today.....  leave it as one
piece and re-install and Torque just a normal.....  if it holds it is good..

Matt Nall
Charleston, Oregon


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