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can head bolts be "tightened" mid-use?

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DONT do that. when installing, you tighten them to a specific torque, =
then exactly 1/2 turn more. that last 1/2 turn is what compresses the =
head gasket, and can require torque easily exceeding 100 ft-lbs. the =
trick is that some bolts may require less torque to go their 1/2 turn, =
so its actually normal to have slightly varying torques on your head =
bolts. the ultimate goal isnt to reach a specific torque, its to evenly =
compress the head gasket. messing with the bolts _at all_ after that =
point will risk breaking the gasket seal.
Al

  ----- Original Message -----=20
  From: Jeff Toomasson=20
  To: scirocco-l@scirocco.org=20
  Sent: Tuesday, April 01, 2003 9:17 PM
  Subject: can head bolts be "tightened" mid-use?


  I was just looking at my 9a sitting in my garage and it got pretty =
cruddy over 1.5 years it was in my car. I have a sneaking suspicion part =
of that crud came from the head gasket area. I used the ABA gasket and =
it ran great when I took it out so I don't think I blew anything, but I =
was wondering if there was any way I could "adjust" the headbolts to =
make sure. Maybe just to make sure they're on torque or even maybe give =
'em a hair tighter??  Any thoughts?

  TIA, JT





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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>DONT do that. when installing, you =
tighten them to=20
a specific torque, then exactly 1/2 turn more. that last 1/2 turn is =
what=20
compresses the head gasket, and can require torque easily exceeding 100 =
ft-lbs.=20
the trick is that some bolts may require less torque to go their 1/2 =
turn, so=20
its actually normal to have slightly varying torques on your head bolts. =
the=20
ultimate goal isnt to reach a specific torque, its to=20
evenly&nbsp;compress&nbsp;the head gasket. messing with the bolts _at =
all_ after=20
that point will risk breaking the gasket seal.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Al</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Djtoomasson@yahoo.com =
href=3D"mailto:jtoomasson@yahoo.com";>Jeff=20
  Toomasson</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dscirocco-l@scirocco.org=20
  href=3D"mailto:scirocco-l@scirocco.org";>scirocco-l@scirocco.org</A> =
</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, April 01, 2003 =
9:17=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> can head bolts be =
"tightened"=20
  mid-use?</DIV>
  <DIV><BR></DIV>
  <P>I was just looking at my 9a sitting in my garage and it got pretty =
cruddy=20
  over 1.5 years it was in my car. I have a sneaking suspicion part of =
that crud=20
  came from the head gasket area. I used the ABA gasket and it ran great =
when I=20
  took it out&nbsp;so I don't think I blew anything, but I was wondering =
if=20
  there was any way I could "adjust" the headbolts to make sure. Maybe =
just to=20
  make sure they're on torque or even maybe give 'em&nbsp;a hair =
tighter??&nbsp;=20
  Any thoughts?</P>
  <P>TIA, JT</P>
  <P><BR>
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href=3D"http://us.rd.yahoo.com/finance/mailsig/*http://tax.yahoo.com";>Yah=
oo! Tax=20
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