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Head leak

To: "MG List" <mgs@Autox.Team.Net>
Subject: Head leak
From: "Danny Varnado" <>
Date: Thu, 21 Oct 2004 16:00:33 -0500
>I have a very strange water leak problem on my '74 MGB engine.  After 
>driving about 10 miles a small white dried run of water (antifreeze 
>residue) will appear.  It shows up on the spark plug side of the head about 
>3/8" from the top of the head above and towards the front of #3 spark plug. 
>I have cleaned off the paint and wire brushed the area .  I have looked at 
>the area with a magnifying glass and had it dye checked to look for a crack 
>or pin hole.  I have inspected the area  cold, hot, and hot with the engine 
>running without finding any indication of the leak.  I have never seen the 
>leak wet, only the dried residue of the run after driving the car.   It's 
>almost like water loss through osmosis.  The amount of water leaking is 
>almost insignificant.  I cannot detect any drop in the overflow tank level. 
>My concern is whether or not the head has a very thin spot in the water 
>jacket because of poor casting, corrosion or erosion.  I don't know wether 
>or not it will get any worse  I'd hate to be going down the road and have 
>it blow out.  Any suggestions would be greatly appreciated.
Danny V. 

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