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Agreed. Mine was a TR3 block and they had less meat than the later blocks,
thus more susceptible to the cracking. The crack was only found when it got
bigger, multiple head gaskets later. This was in 1997, before I knew any
better. A healthy TR4 block was the permanent solution.
Bob Kramer
On Tue, Jan 14, 2020 at 3:08 PM Chris Marx via Fot <fot@autox.team.net>
wrote:
> If the block is cracking from head stud to water jacket, it is normally
> caused by tightening the head studs in the block.
>
> To avoid cracks, run the studs in by hand, without any tool. That is
> enough.
>
> Tighten them will split the block.
>
>
>
> The torque of the head nuts are at the limit of what the block can take,
> that=E2=80=99s why the split in the thread hole zone when the studs are w=
renched in.
>
>
>
> Cheers
>
> Chris
>
>
>
>
>
> *Von:* Fot <fot-bounces@autox.team.net> *Im Auftrag von *fubog1 via Fot
> *Gesendet:* Dienstag, 14. Januar 2020 22:00
> *An:* fot@autox.team.net
> *Betreff:* Re: [Fot] Main brg strap
>
>
>
> That crack is pretty common with these, a Timesert or similar is the
> correct repair.
>
> Re the center main cap strap, in my experience, these are engines are goo=
d
> up to 6.5kish, if it has a good crank & all is within spec and well
> balanced, and the loads are within reasonable limits.
>
> Beyond that the bending loads increase with RPM, due to the recip weight
> heavily loading that center main, and it gets overloaded.
>
> Once the cap deforms and/or fastener stretches, ie it's not round anymore
> and not supporting the bearings, the bad stuff starts to happen.
>
> You can tell if it getting overloaded, measure the center journal very
> carefully, we're into tenths now, and note where the wear is, it's normal=
ly
> even all around the journal.
>
> When the load gets too heavy the wear will be mostly on the crankpin side
> of the journal; it will be very obvious.
>
> At that point a center strap will help for sure but the loads will still
> be there unless weight is reduced.
>
> This is why I try to focus on torque vs high RPM HP with these engines.
>
>
>
> Glen
>
>
>
>
>
> On Mon, Jan 13, 2020 at 10:43 PM Nick Black via Fot <fot@autox.team.net>
> wrote:
>
> Well it=E2=80=99s finally time to build a new motor... the crack at the r=
ear head
> bolt just won=E2=80=99t stop leakin anymore...so...
> I=E2=80=99ve found the Chevy front strap to use on the center main, but w=
hat are
> you using for main bolts/studs for the additional length?
> How about a complete set of fasteners for the mains? Does ARP make
> anything?
>
> Motoring on in NORCAL
> Nick
>
> Sent from the wilds of NorCal
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage
>
> : http://autox.team.net/mailman/options/fot/rkramer56@gmail.com
>
>
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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>
> _______________________________________________
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>
> http://www.fot-racing.com
>
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>
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>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
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>
>
>
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<div dir=3D"ltr">Agreed.=C2=A0 Mine was a TR3 block and they had less meat =
than the later blocks, thus more susceptible to the cracking. The crack was=
only found when it got bigger, multiple head gaskets later. This was in 19=
97, before I knew any better.=C2=A0 A healthy TR4 block was the permanent s=
olution.<div><br clear=3D"all"><div><div dir=3D"ltr" class=3D"gmail_signatu=
re" data-smartmail=3D"gmail_signature"><div dir=3D"ltr">Bob Kramer</div></d=
iv></div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" cl=
ass=3D"gmail_attr">On Tue, Jan 14, 2020 at 3:08 PM Chris Marx via Fot <<=
a href=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a>> wrote:<br><=
/div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bo=
rder-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"DE"><di=
v class=3D"gmail-m_-5809177807589363605WordSection1"><p class=3D"MsoNormal"=
><span lang=3D"EN-US">If the block is cracking from head stud to water jack=
et, it is normally caused by tightening the head studs in the block.<u></u>=
<u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US">To avoid crac=
ks, run the studs in by hand, without any tool. That is enough.<u></u><u></=
u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US">Tighten them will =
split the block.<u></u><u></u></span></p><p class=3D"MsoNormal"><span lang=
=3D"EN-US"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span lang=
=3D"EN-US">The torque of the head nuts are at the limit of what the block c=
an take, that=E2=80=99s why the split in the thread hole zone when the stud=
s are wrenched in.<u></u><u></u></span></p><p class=3D"MsoNormal"><span lan=
g=3D"EN-US"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span lan=
g=3D"EN-US">Cheers<u></u><u></u></span></p><p class=3D"MsoNormal"><span lan=
g=3D"EN-US">Chris<u></u><u></u></span></p><p class=3D"MsoNormal"><span lang=
=3D"EN-US"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span lang=
=3D"EN-US"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><b>Von:</b=
> Fot <<a href=3D"mailto:fot-bounces@autox.team.net"; target=3D"_blank">f=
ot-bounces@autox.team.net</a>> <b>Im Auftrag von </b>fubog1 via Fot<br><=
b>Gesendet:</b> Dienstag, 14. Januar 2020 22:00<br><b>An:</b> <a href=3D"ma=
ilto:fot@autox.team.net" target=3D"_blank">fot@autox.team.net</a><br><b>Bet=
reff:</b> Re: [Fot] Main brg strap<u></u><u></u></p><p class=3D"MsoNormal">=
<u></u>=C2=A0<u></u></p><div><div><div id=3D"gmail-m_-5809177807589363605yi=
v9217778070"><div><div><blockquote style=3D"margin-left:6.75pt;margin-right=
:0cm"><div id=3D"gmail-m_-5809177807589363605yiv9217778070"><div><p class=
=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:Arial,sans-serif;c=
olor:black">That crack is pretty common with these, a Timesert or similar i=
s the correct repair.<u></u><u></u></span></p></div><div><p class=3D"MsoNor=
mal"><span style=3D"font-size:10pt;font-family:Arial,sans-serif;color:black=
">Re the center main cap strap, in my experience, these are engines are goo=
d up to 6.5kish, if it has a good crank & all is within spec and well b=
alanced, and the loads are within reasonable limits.<u></u><u></u></span></=
p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-fami=
ly:Arial,sans-serif;color:black">Beyond that the bending loads increase wit=
h RPM, due to the recip weight heavily loading that center main, and it get=
s overloaded.<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><sp=
an style=3D"font-size:10pt;font-family:Arial,sans-serif;color:black">Once t=
he cap deforms and/or fastener stretches, ie it's not round anymore and=
not supporting the bearings, the bad stuff starts to happen.<u></u><u></u>=
</span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10pt;=
font-family:Arial,sans-serif;color:black">You can tell if it getting overlo=
aded, measure the center journal very carefully, we're into tenths now,=
and note where the wear is, it's normally even all around the journal.=
<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"f=
ont-size:10pt;font-family:Arial,sans-serif;color:black">When the load gets =
too heavy the wear will be mostly on the crankpin side of the journal; it w=
ill be very obvious.<u></u><u></u></span></p></div><div><p class=3D"MsoNorm=
al"><span style=3D"font-size:10pt;font-family:Arial,sans-serif;color:black"=
>At that point a center strap will help for sure but the loads will still b=
e there unless weight is reduced.<u></u><u></u></span></p></div><div><p cla=
ss=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:Arial,sans-serif=
;color:black">This is why I try to focus on torque vs high RPM HP with thes=
e engines.<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span =
style=3D"font-size:10pt;font-family:Arial,sans-serif;color:black"><u></u>=
=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"fo=
nt-size:10pt;font-family:Arial,sans-serif;color:black">Glen<u></u><u></u></=
span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10pt;fo=
nt-family:Arial,sans-serif;color:black"><u></u>=C2=A0<u></u></span></p></di=
v><div><p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:Ari=
al,sans-serif;color:black"><u></u>=C2=A0<u></u></span></p><div><div id=3D"g=
mail-m_-5809177807589363605yiv9217778070yqtfd74137"><div><p class=3D"MsoNor=
mal"><span style=3D"font-size:10pt;font-family:Arial,sans-serif;color:black=
">On Mon, Jan 13, 2020 at 10:43 PM Nick Black via Fot <<a href=3D"mailto=
:fot@autox.team.net" target=3D"_blank">fot@autox.team.net</a>> wrote:<u>=
</u><u></u></span></p></div></div><blockquote style=3D"border-top:none;bord=
er-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);pad=
ding:0cm 0cm 0cm 6pt;margin-left:4.8pt;margin-right:0cm"><div id=3D"gmail-m=
_-5809177807589363605yiv9217778070yqtfd38436"><p class=3D"MsoNormal"><span =
style=3D"font-size:10pt;font-family:Arial,sans-serif;color:black">Well it=
=E2=80=99s finally time to build a new motor... the crack at the rear head =
bolt just won=E2=80=99t stop leakin anymore...so...<br>I=E2=80=99ve found t=
he Chevy front strap to use on the center main, but what are you using for =
main bolts/studs for the additional length?<br>How about a complete set of =
fasteners for the mains? Does ARP make anything?<br><br>Motoring on in NORC=
AL<br>Nick<br><br>Sent from the wilds of NorCal <br>_______________________=
________________________<br><a href=3D"mailto:fot@autox.team.net"; target=3D=
"_blank">fot@autox.team.net</a><br><br><a href=3D"http://www.fot-racing.com=
" target=3D"_blank">http://www.fot-racing.com</a><br><br>Donate: <a href=3D=
"http://www.team.net/donate.html"; target=3D"_blank">http://www.team.net/don=
ate.html</a><br>Archive: <a href=3D"http://autox.team.net/archive"; target=
=3D"_blank">http://autox.team.net/archive</a> <a href=3D"http://www.team.ne=
t/pipermail/fotUnsubscribe/Manage" target=3D"_blank">http://www.team.net/pi=
permail/fot<br>Unsubscribe/Manage</a><u></u><u></u></span></p></div><p clas=
s=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:Arial,sans-serif;=
color:black">: <a href=3D"http://autox.team.net/mailman/options/fot/rkramer=
56@gmail.com" target=3D"_blank">http://autox.team.net/mailman/options/fot/r=
kramer56@gmail.com</a> <u></u><u></u></span></p><div id=3D"gmail-m_-5809177=
807589363605yiv9217778070yqtfd54929"><p class=3D"MsoNormal" style=3D"margin=
-bottom:12pt"><span style=3D"font-size:10pt;font-family:Arial,sans-serif;co=
lor:black"><br><br><u></u><u></u></span></p></div></blockquote></div></div>=
</div><div id=3D"gmail-m_-5809177807589363605yiv9217778070yqtfd12585"><p cl=
ass=3D"MsoNormal" style=3D"margin-bottom:12pt"><span style=3D"font-size:10p=
t;font-family:Arial,sans-serif;color:black">_______________________________=
________________<br><a href=3D"mailto:fot@autox.team.net"; target=3D"_blank"=
>fot@autox.team.net</a><br><br><a href=3D"http://www.fot-racing.com"; target=
=3D"_blank">http://www.fot-racing.com</a><br><br>Donate: <a href=3D"http://=
www.team.net/donate.html" target=3D"_blank">http://www.team.net/donate.html=
</a><br>Archive: <a href=3D"http://autox.team.net/archive"; target=3D"_blank=
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et.works@gte.net</a><br><br><u></u><u></u></span></p></div></blockquote></d=
iv></div></div><p class=3D"MsoNormal" style=3D"margin-bottom:12pt"><span st=
yle=3D"font-size:10pt;font-family:Arial,sans-serif;color:black">___________=
____________________________________<br><a href=3D"mailto:fot@autox.team.ne=
t" target=3D"_blank">fot@autox.team.net</a><br><br><a href=3D"http://www.fo=
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div></div>_______________________________________________<br>
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</blockquote></div>
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_______________________________________________
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http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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