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Re: Valve clearance on '74 MGB

To: Barney Gaylord <>
Subject: Re: Valve clearance on '74 MGB
From: Charles & Peggy Robinson <>
Date: Tue, 09 May 2006 16:06:25 -0500
   Neat-O, Barney!  Excellent info!  I never thought about it that way. 
  Mostly, I like that this method makes up for errors due to FWT.



Barney Gaylord wrote:
> You can adjust the valve gap on a stock MG engine without using 
> either a click adjust or a feeler gauge.  Rotate the pushrod with 
> your fingers.  Turn the adjuster screw down to close the gap until 
> the pushrod stops turning (zero clearance).  Note the orientation of 
> the slot in the adjuster screw, and think of a position at right 
> angles to it (make an "X" with your fingers).  Rotate the screw 
> anti-clockwise 1/4 turn (or 91 degrees if you prefer), and lock down 
> the jam nut.  That's it, resulting in a perfect .015 inch gap.
> It isn't magic.  It is a result of 24 threads per inch and 1.42 to 1 
> rocker arm ratio.
> The math is:  1/24 x 1/4 x 1.42 = 0.0148
> You would have to miss the rotation angle by 6 degrees to have an 
> error of.001 inch.

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