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Re: [oletrucks] Overheating (Wally)

To: monadnoc@crystal-mtn.com, oletrucks@autox.team.net
Subject: Re: [oletrucks] Overheating (Wally)
From: Passnb4U@aol.com
Date: Mon, 20 Sep 1999 10:55:50 EDT
In a message dated 9/20/99 6:42:53 AM Pacific Daylight Time, 
monadnoc@crystal-mtn.com writes:

<< 
 > 
 > I had a machine shop miss cracks with magnaflux.  They didn't clean it well
 > enough first. I  sold a used head with no crack guaranty.  I had to eat 
that
 > one.
 
 
 Bob brings up a good point here.  Magnafluxing is effective only if the 
person
 doing the job is properly trained.  The head or block must be completely 
cleaned
 of all oil and grease first.  Even paint can mask magnaflux indications.  
Using
 the alternating current method, magnaflux will find cracks that come to the
 surface of the part.  The direct current method will locate sub-surface 
defects,
 but only down as far as 1/8" or so.  And it's much more difficult in
 interpretation.  These 2 methods use a dry, visible powder, but there is 
also a
 wet bath method used with a "black light" and flourescent solution to show 
crack
 locations.  I have been doing these testing methods in the nuclear industry 
for
 20 years, and we need 3-6 months of training to be properly qualified in the
 industry.  BTW, Magnaflux is a brand name of non-destructive testing 
materials. 
 The proper terminology is magnetic particle examination, but like Scotch 
Tape,
 Magnaflux has become the accepted terminology.
 
 Wally / Templeton, MA
 53 3100 rod project >>

  Wally,

  Brings up a question, in your opinion, how well do the flux kits sold from 
Napa work?  I've used them in the past to check for cracks between exhaust 
seats, and assumed I was getting my money's worth.

  Mike
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959

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