[Fot] Carrillo Rod Bolts

[Tim Murphy]

I recently installed Carrillo rods in the TR4 engine.  The bolts are 3/8
inch SPS CARR S6's and are marked "S6-S-A13".
The free length was 1.850 and a stretch of 0.007 inch required 50 FT-LB of
torque.  I used the Loctite anti-Seize compound supplied by Carrillo.  I
would think Carrillo could give you the length of the new S4 (1/4 inch)
bolt. If your bolts are within a couple of thousandths of that dimension you
would be okay.  If they are beyond the 0.007 stretch then they have been
over torqued beyond their yield point and would have to be replaced.

Tim

-----Original Message-----
From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On
Behalf Of marty sukey
Sent: Wednesday, October 03, 2012 8:59 AM
To: FOT
Subject: [Fot] Carrillo Rod Bolts

Rod bolt question for you experts.  I latched onto a used set of Carrillo
rods
for my next spitfire engine.  I figured I would get them crack tested and
size
checked and be on my way. That was until I checked on the tightening
requirements.  According to Carrillo you need to measure the rod bolts when
new and then re-measure them after each disassembly to make sure they have
not
been overstretched.  I am lacking that original length measurement.  I would
just replace them all for good measure but I was quoted a price of $56 per
bolt.  That being said I would prefer to use the original bolts IF they are
still good.  Anybody have any alternative methods of determining if these
rod
bolts have not been over stretched?  The bolts are SPS CARR S4's

Thanks,
Marty
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