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1) Is there a way to check the crankshaft dimensions to see what it has
been ground to that doesn=E2=80=99t require pulling the engine? I=E2=80=99d=
like to know
if the crank had to ground to the correct dimensions or not.
you would have to pull the oil pan off and remove the rear main cap and the=
n you could get a measurement.
2) If the crankshaft was ground to the wrong dimensions, is there a way to
fix it (e.g., special seal) short of replacing the crankshaft? Replacement
crankshafts are scarce and quite expensive (>USD$1600).
nope. if its undersize your done.
3) If the crankshaft was ground to the correct dimensions, what have
others done to keep that oil seal conversion from leaking?
i have done 2 that required the crank be machined.i found in both cases tha=
t i needed to shim something. the new scroll seal was interfering with the =
flywheel. im thinking i had to shim the flywheel with a single washer. just=
be sure you check that things turn ok with the transmission mounted before=
you put it in the car. yes i put it in the car the first time without chec=
king.its been more that 10 years since i did those builds so forgive the me=
mory.the other thing i did when assembling the scroll and seal was:1) make =
sure the scroll and rubber seal are very clean by wiping with alcohol or si=
milar.2) then i wiped the crankshaft at the point of touching the seal with=
oil on my fingers. just enough to leave a thin film.=C2=A03) where the rub=
ber seal comes together i applied some RTV silicone adhesive to the joint. =
its ok if it oozes a little as the oil on the crank will not allow it to st=
ick to the crank.4) once assembled let it sit for about a week to let the s=
ealant fully cure. do not turn the crank, do not move any parts.having done=
this method twice i have had what id like to say is no leak, but a small s=
tain occasionally has been experienced.
Frank
On Wednesday, February 12, 2025 at 07:56:15 AM PST, Dave MacKay <dave@m=
dmackay.ca> wrote: =20
=20
I followed the recent exchange about =E2=80=9CTR Rear Crank Seal Rope?=E2=
=80=9D with
interest and corresponded with all who replied to the OP. That has me
thinking about how I might address my situation.
In 2008, the engine in my TR3A was rebuilt. As part of that effort an OIL
SEAL CONVERSION KIT was fitted. The conversion required that the scroll on
the crankshaft be ground down. It has always leaked.
I had convinced myself that fixing the leak would be too much trouble and
too expensive to be worth doing. I envisioned having to replace the
crankshaft and then using a more modern conversion (Moss 837-160). I
wanted to check with the list to see if that=E2=80=99s the case or not.
I believe --- but am not certain --- that the conversion was sourced from
Moss (perhaps p/n 837-006). I am aware that incorrect instructions were
provided with some of the conversion kits so that the crankshafts were
ground too small. I don=E2=80=99t know if that=E2=80=99s the case with my c=
onversion: the
crank may have been ground to the correct dimensions, or it might not have
been.
I have three questions:
1) Is there a way to check the crankshaft dimensions to see what it has
been ground to that doesn=E2=80=99t require pulling the engine? I=E2=80=99d=
like to know
if the crank had to ground to the correct dimensions or not.
2) If the crankshaft was ground to the wrong dimensions, is there a way to
fix it (e.g., special seal) short of replacing the crankshaft? Replacement
crankshafts are scarce and quite expensive (>USD$1600).
3) If the crankshaft was ground to the correct dimensions, what have
others done to keep that oil seal conversion from leaking?
I=E2=80=99d welcome any input from those on this list.
Dave MacKay
1960 Triumph TR3A, s/n 68639L
near Toronto, Canada
** triumphs@autox.team.net **
Archive: http://www.team.net/pipermail/triumphs=C2=A0 http://www.team.net/a=
rchive
3@yahoo.com
=20
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<html><head></head><body><div class=3D"ydpd02c096fyahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px=
;"><div></div>
<div dir=3D"ltr" data-setdir=3D"false"><div><div dir=3D"ltr" style=
=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-serif;">1) Is there=
a way to check the crankshaft dimensions to see what it has<br></div><div =
dir=3D"ltr" style=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-se=
rif;">been ground to that doesn=E2=80=99t require pulling the engine? I=E2=
=80=99d like to know<br></div><div dir=3D"ltr" style=3D"font-family: Helvet=
ica Neue, Helvetica, Arial, sans-serif;">if the crank had to ground to the =
correct dimensions or not.<br></div><div dir=3D"ltr" style=3D"font-family: =
Helvetica Neue, Helvetica, Arial, sans-serif;" data-setdir=3D"false"><font =
color=3D"#cb008e">you would have to pull the oil pan off and remove the rea=
r main cap and then you could get a measurement.</font></div><div dir=3D"lt=
r" style=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-serif;"><br=
></div><div dir=3D"ltr" style=3D"font-family: Helvetica Neue, Helvetica, Ar=
ial, sans-serif;">2) If the crankshaft was ground to the wrong dimensions, =
is there a way to<br></div><div dir=3D"ltr" style=3D"font-family: Helvetica=
Neue, Helvetica, Arial, sans-serif;">fix it (e.g., special seal) short of =
replacing the crankshaft? Replacement<br></div><div dir=3D"ltr" style=3D"fo=
nt-family: Helvetica Neue, Helvetica, Arial, sans-serif;">crankshafts are s=
carce and quite expensive (>USD$1600).<br></div><div dir=3D"ltr" style=
=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-serif;" data-setdir=
=3D"false"><font color=3D"#cb008e">nope. if its undersize your done.</font>=
</div><div dir=3D"ltr" style=3D"font-family: Helvetica Neue, Helvetica, Ari=
al, sans-serif;"><br></div><div dir=3D"ltr" style=3D"font-family: Helvetica=
Neue, Helvetica, Arial, sans-serif;">3) If the crankshaft was ground to th=
e correct dimensions, what have<br></div><div dir=3D"ltr" style=3D"font-fam=
ily: Helvetica Neue, Helvetica, Arial, sans-serif;">others done to keep tha=
t oil seal conversion from leaking?</div></div><br></div><div dir=3D"ltr" d=
ata-setdir=3D"false"><font color=3D"#cb008e"><br></font></div><div dir=3D"l=
tr" data-setdir=3D"false"><div><div dir=3D"ltr" style=3D"font-family: Helve=
tica Neue, Helvetica, Arial, sans-serif; font-size: 16px;"><font color=3D"#=
cb008e">i have done 2 that required the crank be machined.</font></div><div=
dir=3D"ltr" style=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-s=
erif; font-size: 16px;"><font color=3D"#cb008e">i found in both cases that =
i needed to shim something. the new scroll seal was interfering with the fl=
ywheel. im thinking i had to shim the flywheel with a single washer. just b=
e sure you check that things turn ok with the transmission mounted before y=
ou put it in the car. yes i put it in the car the first time without checki=
ng.</font></div><div dir=3D"ltr" style=3D"font-family: Helvetica Neue, Helv=
etica, Arial, sans-serif; font-size: 16px;"><font color=3D"#cb008e">its bee=
n more that 10 years since i did those builds so forgive the memory.</font>=
</div><div dir=3D"ltr" style=3D"font-family: Helvetica Neue, Helvetica, Ari=
al, sans-serif; font-size: 16px;"><font color=3D"#cb008e">the other thing i=
did when assembling the scroll and seal was:</font></div><div dir=3D"ltr" =
style=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-serif; font-si=
ze: 16px;"><font color=3D"#cb008e">1) make sure the scroll and rubber seal =
are very clean by wiping with alcohol or similar.</font></div><div dir=3D"l=
tr" style=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-serif; fon=
t-size: 16px;"><font color=3D"#cb008e">2) then i wiped the crankshaft at th=
e point of touching the seal with oil on my fingers. just enough to leave a=
thin film.</font></div><div dir=3D"ltr" style=3D"font-family: Helvetica Ne=
ue, Helvetica, Arial, sans-serif; font-size: 16px;"><font color=3D"#cb008e"=
> 3) where the rubber seal comes together i applied some RTV silicone =
adhesive to the joint. its ok if it oozes a little as the oil on the crank =
will not allow it to stick to the crank.</font></div><div dir=3D"ltr" style=
=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-serif; font-size: 1=
6px;"><font color=3D"#cb008e">4) once assembled let it sit for about a week=
to let the sealant fully cure. do not turn the crank, do not move any part=
s.</font></div><div dir=3D"ltr" style=3D"font-family: Helvetica Neue, Helve=
tica, Arial, sans-serif; font-size: 16px;"><font color=3D"#cb008e">having d=
one this method twice i have had what id like to say is no leak, but a smal=
l stain occasionally has been experienced.</font></div></div><br></div><div=
dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=
=3D"false">Frank</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div=
dir=3D"ltr" data-setdir=3D"false"><br></div><div><br></div>
=20
</div><div id=3D"ydp2827218dyahoo_quoted_0277346035" class=3D"ydp28=
27218dyahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On Wednesday, February 12, 2025 at 07:56:15 AM PST,=
Dave MacKay <dave@mdmackay.ca> wrote:
</div>
<div><br></div>
<div><br></div>
=20
=20
<div><div dir=3D"ltr">I followed the recent exchange about =
=E2=80=9CTR Rear Crank Seal Rope?=E2=80=9D with<br></div><div dir=3D"ltr">i=
nterest and corresponded with all who replied to the OP. That has me<br></d=
iv><div dir=3D"ltr">thinking about how I might address my situation.<br></d=
iv><div dir=3D"ltr"><br></div><div dir=3D"ltr">In 2008, the engine in my TR=
3A was rebuilt. As part of that effort an OIL<br></div><div dir=3D"ltr">SEA=
L CONVERSION KIT was fitted. The conversion required that the scroll on<br>=
</div><div dir=3D"ltr">the crankshaft be ground down. It has always leaked.=
<br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">I had convinced mysel=
f that fixing the leak would be too much trouble and<br></div><div dir=3D"l=
tr">too expensive to be worth doing. I envisioned having to replace the<br>=
</div><div dir=3D"ltr">crankshaft and then using a more modern conversion (=
Moss 837-160). I<br></div><div dir=3D"ltr">wanted to check with the list to=
see if that=E2=80=99s the case or not.<br></div><div dir=3D"ltr"><br></div=
><div dir=3D"ltr">I believe --- but am not certain --- that the conversion =
was sourced from<br></div><div dir=3D"ltr">Moss (perhaps p/n 837-006). I am=
aware that incorrect instructions were<br></div><div dir=3D"ltr">provided =
with some of the conversion kits so that the crankshafts were<br></div><div=
dir=3D"ltr">ground too small. I don=E2=80=99t know if that=E2=80=99s the c=
ase with my conversion: the<br></div><div dir=3D"ltr">crank may have been g=
round to the correct dimensions, or it might not have<br></div><div dir=3D"=
ltr">been.<br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">I have thre=
e questions:<br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">1) Is the=
re a way to check the crankshaft dimensions to see what it has<br></div><di=
v dir=3D"ltr">been ground to that doesn=E2=80=99t require pulling the engin=
e? I=E2=80=99d like to know<br></div><div dir=3D"ltr">if the crank had to g=
round to the correct dimensions or not.<br></div><div dir=3D"ltr"><br></div=
><div dir=3D"ltr">2) If the crankshaft was ground to the wrong dimensions, =
is there a way to<br></div><div dir=3D"ltr">fix it (e.g., special seal) sho=
rt of replacing the crankshaft? Replacement<br></div><div dir=3D"ltr">crank=
shafts are scarce and quite expensive (>USD$1600).<br></div><div dir=3D"=
ltr"><br></div><div dir=3D"ltr">3) If the crankshaft was ground to the corr=
ect dimensions, what have<br></div><div dir=3D"ltr">others done to keep tha=
t oil seal conversion from leaking?<br></div><div dir=3D"ltr"><br></div><di=
v dir=3D"ltr">I=E2=80=99d welcome any input from those on this list.<br></d=
iv><div dir=3D"ltr"><br></div><div dir=3D"ltr">Dave MacKay<br></div><div di=
r=3D"ltr">1960 Triumph TR3A, s/n 68639L<br></div><div dir=3D"ltr">near Toro=
nto, Canada<br></div><div dir=3D"ltr">** <a href=3D"mailto:triumphs@autox.t=
eam.net" rel=3D"nofollow" target=3D"_blank">triumphs@autox.team.net</a> **<=
br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Donate: <a href=3D"htt=
p://www.team.net/donate.html" rel=3D"nofollow" target=3D"_blank">http://www=
.team.net/donate.html</a><br></div><div dir=3D"ltr">Archive: <a href=3D"htt=
p://www.team.net/pipermail/triumphs" rel=3D"nofollow" target=3D"_blank">htt=
p://www.team.net/pipermail/triumphs</a> <a href=3D"http://www.team.ne=
t/archive" rel=3D"nofollow" target=3D"_blank">http://www.team.net/archive</=
a><br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Unsubscribe/Manage:=
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ns/triumphs/yellowtr3@yahoo.com</a><br></div></div>
</div>
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Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
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