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The top bow of a BT7 is a complex compound curve. My dad made one for me
back in the early 2000=92s. He was a very good woodworker but he had to =
make
it twice to get it right. Don=92t rule out the bow shape in causing the =
fit
problem.=20
=20
John
=20
From: Healeys [mailto:healeys-bounces@autox.team.net] On Behalf Of
m.g.sharp--- via Healeys
Sent: Sunday, September 27, 2020 9:10 AM
To: 'healeys' <healeys@autox.team.net>
Subject: [Healeys] BT7 soft-top header to windscreen seal
=20
Hi all, I am replacing the soft-top on my BT7 and rebuilt the wooden =
header
piece that secures the top to the windscreen. The rubber seal that goes
between the aluminum strip and the windscreen is causing me grief. The =
seal
I removed I believe is original. Although deteriorated in sections, it =
was
surprisingly good in places, so I feel I have a reasonably good example =
of
what was there. Also the ends appear to be molded in a curve to match =
the
aluminum strip, as opposed to being cut as a replacement would be.
=20
This (possibly) original seal was a solid piece of compressible foam =
rubber
about =BE=94 wide and appears to have tapered in thickness, from =BC=94 =
to 3/16=94,
although this seems unlikely. I recognize that 60 years of compression =
makes
exact measurement impossible and uneven compression may have made it =
appear
tapered in section.
=20
The replacement I got was hollow and narrower. Compressed slightly, =
enough
to just squeeze the hollow centre closed, it was =BC=94 thick. However, =
when I
installed it, the top bow would not go onto the windscreen without a =
huge
amount of effort and force, and I was never convinced it was on =
properly.
The top bow always used to fit on the windscreen snugly and with ease in =
the
past (I have owned the car for 46 years). I don=92t understand this, as =
the
new seal when compressed would seem to be the same thickness as the
original, but =93the proof is in the pudding=94 =96 it does not fit!
=20
To experiment, I cut the replacement seal to half the thickness, so it =
is
now 1/8=94 thick, and the top bow mounted on the windscreen with ease. =
So the
problem is the seal. However, I think 1/8=94 is too thin and it will =
likely
leak.
=20
The Concours Guide, Supplement 1, page 5, provides a photo of a 100 =
seal,
but it is silent on whether this seal was carried through to the BT7 or =
was
changed at some point. Does anyone know?
=20
Does anyone have any comment on the above, and more importantly a source =
for
a replacement seal that is closer to the original?
=20
With thanks, Mirek
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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>The top bow of a BT7 is a complex compound =
curve. My dad made one for me back in the early 2000’s. He was a =
very good woodworker but he had to make it twice to get it right. =
Don’t rule out the bow shape in causing the fit problem. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>John<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p> </o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> Healeys =
[mailto:healeys-bounces@autox.team.net] <b>On Behalf Of </b>m.g.sharp--- =
via Healeys<br><b>Sent:</b> Sunday, September 27, 2020 9:10 =
AM<br><b>To:</b> 'healeys' =
<healeys@autox.team.net><br><b>Subject:</b> [Healeys] BT7 soft-top =
header to windscreen seal<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>Hi =
all, I am replacing the soft-top on my BT7 and rebuilt the wooden =
header piece that secures the top to the windscreen. The rubber =
seal that goes between the aluminum strip and the windscreen is causing =
me grief. The seal I removed I believe is original. Although =
deteriorated in sections, it was surprisingly good in places, so I feel =
I have a reasonably good example of what was there. Also the ends =
appear to be molded in a curve to match the aluminum strip, as opposed =
to being cut as a replacement would be.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>This =
(possibly) original seal was a solid piece of compressible foam rubber =
about =BE” wide and appears to have tapered in thickness, from =
=BC” to 3/16”, although this seems unlikely. I recognize =
that 60 years of compression makes exact measurement impossible and =
uneven compression may have made it appear tapered in =
section.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>The replacement I got was hollow and narrower. =
Compressed slightly, enough to just squeeze the hollow centre closed, it =
was =BC” thick. However, when I installed it, the top bow =
would not go onto the windscreen without a huge amount of effort and =
force, and I was never convinced it was on properly. The top bow =
always used to fit on the windscreen snugly and with ease in the past (I =
have owned the car for 46 years). I don’t understand this, =
as the new seal when compressed would seem to be the same thickness as =
the original, but “the proof is in the pudding” – it =
does not fit!<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>To experiment, I cut the replacement seal to half the =
thickness, so it is now 1/8” thick, and the top bow mounted on the =
windscreen with ease. So the problem is the seal. However, I =
think 1/8” is too thin and it will likely leak.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal><span =
lang=3DEN-CA>The Concours Guide, Supplement 1, page 5, provides a photo =
of a 100 seal, but it is silent on whether this seal was carried through =
to the BT7 or was changed at some point. Does anyone =
know?<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-CA><o:p> </o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-CA>Does anyone have any comment on the above, and more =
importantly a source for a replacement seal that is closer to the =
original?<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-CA><o:p> </o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-CA>With thanks, Mirek<o:p></o:p></span></p></div></body></html>
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