<VV> Stuck valve cover bolt.

[Michael]

Secure it on a mill bed and use a carbide end mill...only accurate way!

Mike McCrae

------ Original Message ------
From: "Bruce Carlton via VirtualVairs" <virtualvairs at corvair.org>
To: "Ignacio Valdes via VirtualVairs" <virtualvairs at corvair.org>
Sent: 2/9/2018 12:27:40 PM
Subject: Re: <VV> Stuck valve cover bolt.

>I assume that you have already tried to drill out the broken valve 
>cover bolt. If you have not, I have found the best way for me to drill 
>out one of these bolts is to first center punch the broken end of the 
>bolt as close to center as possible and then start with a small drill 
>like about a 1/16 or 3/32 drill and after that slowly increase the size 
>of the drill up to the drill size for a helicoil for the replacement 
>bolt which would be a 1/4 -20 helicoil or there are other brands of 
>inserts that require a larger threaded hole than a helicoil.
>To remove the push rod tubes, you need to remove the rocker arm studs 
>as they hold down the push rod guides that cover the ends of the 
>pushrod tubes. They are easily removed by first removing the rocker 
>arms ( keep the ball pivots and the rocker arm nuts with their specific 
>rocker arms as trhey are worn in as matched pairs at this point and may 
>not pivot properly if mixed up.
>Lubricate the new o rings on the push rod tubes before reinstalling the 
>pushrod tubes. Torques for the reinstallation of the rocker arm studs 
>are available in the back of the shop manual as well as instructions 
>for proper adjustment of the rocker arms.When installling the push rod 
>guides under the rocker arm studs make sure they are the correct side 
>out facing you. there is a stamped letter U in the center of the guide 
>that should be facing out toward you.
>Bruce
>
>
>
>
>
>
>    On Friday, February 9, 2018, 10:07:52 AM EST, Ignacio Valdes via 
>VirtualVairs <virtualvairs at corvair.org> wrote:
>
>Thanks for all the responses.
>
>Answers to questions: The bolt was longer than original which is 
>probably
>why it seized. It is a normal bolt not automotive grade. I first tried 
>to
>weld a nut on but the nut would just break off. Yes I tried a left 
>handed
>drill but it did not work. Then I tried a bolt extractor which did not
>work. Looks like I am going to have to remove the head and take it to a
>machine shop.
>
>In the cars history the motor has been gone through not by me. It has 
>acorn
>nuts on the head bolts and Viton rings. Does a service manual help for 
>this
>such as for torque values on re-assembly? If so, which one?
>
>A secondary objective to the broken valve cover bolt is that the motor
>overheated because of a thrown belt. The motor runs ok but now leaks 
>oil a
>little. The push rod tubes have Viton but seem to be the source. I 
>would
>like to change the Viton rings to try and cure the leak.
>
>Matt, confirm can I just spin the whole rocker stud to get them off? 
>See
>above objectives.
>
>On Thu, Feb 8, 2018 at 8:30 PM, Ignacio Valdes <ivaldes at hal-pc.org> 
>wrote:
>
>>Picture of broken valve cover bolt photograph.
>>
>>On Thu, Feb 8, 2018 at 8:29 PM, Ignacio Valdes <ivaldes at hal-pc.org> 
>>wrote:
>>
>>>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?
>>>
>>>-- IV
>>>
>>
>>
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