Subject: [Shop-talk] Ancient furnace with cracked manifold

From: Jim Stone <[email-masked]>
Date: Mon, 8 Nov 2021 10:39:16 -0500

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My daughter and her boyfriend have bought a turn of the century house =
with an ancient coal-fired furnace that was long ago converted to =
natural gas.  It works fine and they=E2=80=99d like to put off replacing =
it for as long as possible while they invest their money in other parts =
of the house.  However, the furnace has a cast iron exhaust manifold =
that is cracked pretty badly and it scares the hell out of me.  =
Following are some screenshots from a video she sent me, starting with =
the overall exhaust.

You can see the top of the manifold in the lower right.  Here is a side =
view:

The orange goop was applied by a furnace tech they hired, who said he =
really shouldn=E2=80=99t have touched it at all but did what he could.l. =
However, here is a shot just below the goop:

And, a shot from the other side:

As you can see - assuming the photos come through - the manifold is =
totally shot, although it feels solid and doesn=E2=80=99t appear to be =
in danger of falling off.  In theory, it could be removed and taken =
someplace that does cast iron welding, but I suspect that would be a =
royal pain and not guaranteed to succeed.  She has a CO2 detector in the =
basement, but I will be visiting her next week and want to try to do =
more.  =E2=80=9CMore=E2=80=9D might be trying to convince them to bite =
the bullet and replace the system immediately, but I have also thought =
about treating it like an automotive exhaust system and trying to patch =
it to get them by for a season or two.  What are the group's thoughts on =
something like JB Weld High Heat putty =
(https://www.amazon.com/J-B-Weld-8297-HighHeat-Degree/dp/B007PP26RI/ref=3D=
pd_bxgy_2/138-6104268-8394138?pd_rd_w=3DnQ3PU&pf_rd_p=3Dc64372fa-c41c-422e=
-990d-9e034f73989b&pf_rd_r=3D2F076DNFFJBZ1G9PK3TY&pd_rd_r=3D623d1e00-f712-=
4380-897c-474fe9ee6337&pd_rd_wg=3D1YSqH&pd_rd_i=3DB007PP26RI&psc=3D1) =
and/or their high heat wrap =
(https://www.amazon.com/dp/B00N582CBY/ref=3Demc_b_5_t)?

Thanks,
Jim (and Sara)

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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">My =
daughter and her boyfriend have bought a turn of the century house with =
an ancient coal-fired furnace that was long ago converted to natural =
gas. &nbsp;It works fine and they=E2=80=99d like to put off replacing it =
for as long as possible while they invest their money in other parts of =
the house. &nbsp;However, the furnace has a cast iron exhaust manifold =
that is cracked pretty badly and it scares the hell out of me. =
&nbsp;Following are some screenshots from a video she sent me, starting =
with the overall exhaust.<div class=3D""><br class=3D""></div><div =
class=3D""><img apple-inline=3D"yes" =
id=3D"2E1AF7F1-5F75-44E0-B946-312D264B4FA6" width=3D"408" height=3D"640" =
src=3D"cid:A892A2F2-EBCD-4783-978B-738C1EB3D295" class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D"">You can see the top of =
the manifold in the lower right. &nbsp;Here is a side view:</div><div =
class=3D""><br class=3D""></div><div class=3D""><img apple-inline=3D"yes" =
id=3D"0384EECE-566F-4871-867F-38F95858D8E8" width=3D"454" height=3D"640" =
src=3D"cid:F2CFDF3A-6BE7-47E4-8943-8EA5A394AC32" class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D"">The orange goop was =
applied by a furnace tech they hired, who said he really shouldn=E2=80=99t=
 have touched it at all but did what he could.l. However, here is a shot =
just below the goop:</div><div class=3D""><br class=3D""></div><div =
class=3D""><img apple-inline=3D"yes" =
id=3D"F3558917-62D3-400E-BEFD-9CBBFDA2F360" width=3D"454" height=3D"572" =
src=3D"cid:EEF55C11-A42D-41A1-8E9C-CDC81D990A57" class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D"">And, a shot from the =
other side:</div><div class=3D""><br class=3D""></div><div class=3D""><img=
 apple-inline=3D"yes" id=3D"C43C8CB3-DA2B-4B0E-AEDD-77B8352C7053" =
width=3D"426" height=3D"640" =
src=3D"cid:925F5EAB-5C1F-4757-881E-82A064EAF383" class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D"">As you can see - =
assuming the photos come through - the manifold is totally shot, =
although it feels solid and doesn=E2=80=99t appear to be in danger of =
falling off. &nbsp;In theory, it could be removed and taken someplace =
that does cast iron welding, but I suspect that would be a royal pain =
and not guaranteed to succeed. &nbsp;She has a CO2 detector in the =
basement, but I will be visiting her next week and want to try to do =
more. &nbsp;=E2=80=9CMore=E2=80=9D might be trying to convince them to =
bite the bullet and replace the system immediately, but I have also =
thought about treating it like an automotive exhaust system and trying =
to patch it to get them by for a season or two. &nbsp;What are the =
group's thoughts on something like JB Weld High Heat putty (<a =
href=3D"https://www.amazon.com/J-B-Weld-8297-HighHeat-Degree/dp/B007PP26RI=
/ref=3Dpd_bxgy_2/138-6104268-8394138?pd_rd_w=3DnQ3PU&amp;pf_rd_p=3Dc64372f=
a-c41c-422e-990d-9e034f73989b&amp;pf_rd_r=3D2F076DNFFJBZ1G9PK3TY&amp;pd_rd=
_r=3D623d1e00-f712-4380-897c-474fe9ee6337&amp;pd_rd_wg=3D1YSqH&amp;pd_rd_i=
=3DB007PP26RI&amp;psc=3D1" =
class=3D"">https://www.amazon.com/J-B-Weld-8297-HighHeat-Degree/dp/B007PP2=
6RI/ref=3Dpd_bxgy_2/138-6104268-8394138?pd_rd_w=3DnQ3PU&amp;pf_rd_p=3Dc643=
72fa-c41c-422e-990d-9e034f73989b&amp;pf_rd_r=3D2F076DNFFJBZ1G9PK3TY&amp;pd=
_rd_r=3D623d1e00-f712-4380-897c-474fe9ee6337&amp;pd_rd_wg=3D1YSqH&amp;pd_r=
d_i=3DB007PP26RI&amp;psc=3D1</a>) and/or their high heat wrap (<a =
href=3D"https://www.amazon.com/dp/B00N582CBY/ref=3Demc_b_5_t" =
class=3D"">https://www.amazon.com/dp/B00N582CBY/ref=3Demc_b_5_t</a>)?</div=
><div class=3D""><br class=3D""></div><div class=3D"">Thanks,</div><div =
class=3D"">Jim (and Sara)</div><div class=3D""><br class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D""><br class=3D""></div><div =
class=3D""><br class=3D""></div></body></html>=

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