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GT6 crank confusion

To: triumphs@autox.team.net, spitfires@autox.team.net
Subject: GT6 crank confusion
From: Sam Gentry <sam@spit6.com>
Date: Sat, 23 Nov 2002 12:36:46 -0500
OK... I am confused... I am checking the crankshaft from my 73 GT6 and the 
dimensions that I get are not even close to the numbers in my Bentley.  The 
rod journals are right on, but the main bearings are way off.  The book 
says 2.001 to 2.0005, but I measure 2.312!!! I have used two micrometers 
and a dial caliper and get the same answer.  I have an old crankshaft that 
measures more or less the same (it is fairly worn).  Does anyone know the 
correct crank main bearing specs?  I don't see how I could be off by 0.311!!

While I am at it... What is the correct bore diameter?  The book says 
2.9405 to 2.9416 in three grades, but pistons no longer seem to be 
available in grades.  The book says that the bore can be as much as 0.010 
over, but over what?  What is the nominal dimension?  Of course, 
2.9405-2.9416 is only 0.0011 so I guess it does not matter much which 
dimension I use.  The middle is 2.941 and that is a number I have seen.  My 
bore is about 2.945-2.947 which is within 0.010 of 2.941.  It is even 
within 0.010 of the smallest diameter specified.

More while I am at it... If the bore is less than 0.010 oversize does that 
mean that I can use standard rings?

Thanks, Sam

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