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Re: [Mgs] rocker threads causing problems

To: "'MG List'" <mgs@autox.team.net>
Subject: Re: [Mgs] rocker threads causing problems
From: "Clayton Kirkwood" <crk@godblessthe.us>
Date: Thu, 7 Oct 2010 22:06:23 -0700
I'm not sure grade 8s would really help; if I understand correctly, grade 8s
are for a different kind of stress.

crk

-----Original Message-----
From: mgs-bounces@autox.team.net [mailto:mgs-bounces@autox.team.net] On
Behalf Of Max Heim
Sent: Thursday, October 07, 2010 4:55 PM
To: MG List
Subject: Re: [Mgs] rocker threads causing problems

Something is wrong here. 25lb/ft can be easily applied with one hand on a
4-inch box wrench. Hard to strip anything bigger than a 5/16 nut if it's
made out of anything tougher than pot metal.

Try using a box wrench instead of the torque wrench and just tighten it
"good and tight", not "as hard as you can". If it still strips, go to a
reputable store and get Grade 8 nuts.

If you have a pop-off torque wrench, I'd say it's definitely way off -- get
it calibrated.


--

Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires



on 10/7/10 12:04 PM, Clayton Kirkwood at crk@godblessthe.us wrote:

> Hi,
> 
>  
> 
> I am putting my rocker assembly back on my head after putting new valve
stem
> oil seals in in an attempt to see where my oil consumption is coming from.
> While tightening the nuts down on the studs, I continue to have a problem
> with the threads of the nuts ripping out. I went to the local parts store
> and asked for grade 5 nuts hoping that the problem was with the nuts being
> ungraded. I continue to have the same problem: I tighten the nuts down to
> 25lbft but they never tighten and I remove the nuts and then have to
remove
> metal twists from around the studs. 25 lbft is the value listed in the
> manual.
> 
>  
> 
> What is going wrong? My guess is that the "grade 5" nuts really aren't
grade
> 5, but I have no way of telling: the flats don't have any markings. I know
> these have to be pretty tight given all of the stresses caused by the cam
> pushing on the rods. Any advice appreciated.
> 
>  
> 
>  
> 
> TIA,
> 
>  
> 
> Clayton
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