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can head bolts be "tightened" mid-use?
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I disagree.....with several points you made.
In my opinion, putting a few more ft/lbs on each bolt will not hurt =
anything.
Larry
----- Original Message -----=20
From: Allyn=20
To: Jeff Toomasson ; scirocco-l@scirocco.org=20
Sent: Tuesday, April 01, 2003 7:03 PM
Subject: Re: can head bolts be "tightened" mid-use?
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
=20
----- 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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<DIV><FONT face=3DArial size=3D2>I disagree.....with several points you=20
made.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>In my opinion, putting a few more =
ft/lbs on each=20
bolt will not hurt anything.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Larry</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-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 href=3D"mailto:amalventano@sc.rr.com"; =
title=3Damalventano@sc.rr.com>Allyn</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
href=3D"mailto:jtoomasson@yahoo.com"=20
title=3Djtoomasson@yahoo.com>Jeff Toomasson</A> ; <A=20
href=3D"mailto:scirocco-l@scirocco.org"=20
title=3Dscirocco-l@scirocco.org>scirocco-l@scirocco.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, April 01, 2003 =
7:03=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: can head bolts be=20
"tightened" mid-use?</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>DONT do that. when installing, you =
tighten them=20
to 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=20
ft-lbs. the trick is that some bolts may require less torque to go =
their 1/2=20
turn, so its actually normal to have slightly varying torques on your =
head=20
bolts. the ultimate goal isnt to reach a specific torque, its to=20
evenly compress the head gasket. messing with the bolts _at =
all_=20
after 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> </DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; =
MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-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 href=3D"mailto:jtoomasson@yahoo.com"; =
title=3Djtoomasson@yahoo.com>Jeff=20
Toomasson</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
href=3D"mailto:scirocco-l@scirocco.org"=20
title=3Dscirocco-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=20
crud came from the head gasket area. I used the ABA gasket and it =
ran great=20
when I took it out so I don't think I blew anything, but I was=20
wondering if there was any way I could "adjust" the headbolts to =
make sure.=20
Maybe just to make sure they're on torque or even maybe give =
'em a hair=20
tighter?? Any thoughts?</P>
<P>TIA, JT</P>
<P><BR>
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