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I also bought the Moss seal kit which had the incorrect scroll dimension.
Yep, it leaked. The fix was to shorten the seal spring by (as I recall)
1/2" and very carefully trim the seal faces slightly to ensure they were
perfectly parallel. It was a fiddly process but worked. Thanks to Tony
Drews (FoT racer) for the tip. For exact dimensions, check Tony's web page
(https://tonydrews.com/uncle_jacks_engine_building_tips.htm#Crank).
hth
jim
On Wed, Feb 12, 2025 at 10:50=E2=80=AFAM Dave MacKay <dave@mdmackay.ca> wro=
te:
> 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 o=
n
> 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=
conversion: the
> crank may have been ground to the correct dimensions, or it might not hav=
e
> 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 t=
o
> fix it (e.g., special seal) short of replacing the crankshaft? Replacemen=
t
> 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 **
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/triumphs
> http://www.team.net/archive
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/triumphs/jhassall@gmail.com
>
--=20
jim W4BEA
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<div dir=3D"ltr">I also bought the Moss seal kit which had the incorrect sc=
roll dimension.=C2=A0 Yep, it leaked.=C2=A0 The fix was to shorten the seal=
spring by (as I recall) 1/2" and very carefully trim the seal faces s=
lightly to ensure they were perfectly parallel.=C2=A0 It was a fiddly proce=
ss but worked.=C2=A0 Thanks to Tony Drews (FoT racer) for the tip.=C2=A0 Fo=
r exact dimensions, check Tony's web page (<a href=3D"https://tonydrews=
.com/uncle_jacks_engine_building_tips.htm#Crank">https://tonydrews.com/uncl=
e_jacks_engine_building_tips.htm#Crank</a>).=C2=A0=C2=A0<div><br></div><div=
>hth</div><div><br></div><div>jim</div></div><br><div class=3D"gmail_quote =
gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Feb 12=
, 2025 at 10:50=E2=80=AFAM Dave MacKay <<a href=3D"mailto:dave@mdmackay.=
ca">dave@mdmackay.ca</a>> wrote:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204=
);padding-left:1ex">I followed the recent exchange about =E2=80=9CTR Rear C=
rank Seal Rope?=E2=80=9D with<br>
interest and corresponded with all who replied to the OP. That has me<br>
thinking about how I might address my situation.<br>
<br>
In 2008, the engine in my TR3A was rebuilt. As part of that effort an OIL<b=
r>
SEAL CONVERSION KIT was fitted. The conversion required that the scroll on<=
br>
the crankshaft be ground down. It has always leaked.<br>
<br>
I had convinced myself that fixing the leak would be too much trouble and<b=
r>
too expensive to be worth doing. I envisioned having to replace the<br>
crankshaft and then using a more modern conversion (Moss 837-160). I<br>
wanted to check with the list to see if that=E2=80=99s the case or not.<br>
<br>
I believe --- but am not certain --- that the conversion was sourced from<b=
r>
Moss (perhaps p/n 837-006). I am aware that incorrect instructions were<br>
provided with some of the conversion kits so that the crankshafts were<br>
ground too small. I don=E2=80=99t know if that=E2=80=99s the case with my c=
onversion: the<br>
crank may have been ground to the correct dimensions, or it might not have<=
br>
been.<br>
<br>
I have three questions:<br>
<br>
1) Is there a way to check the crankshaft dimensions to see what it has<br>
been ground to that doesn=E2=80=99t require pulling the engine? I=E2=80=99d=
like to know<br>
if the crank had to ground to the correct dimensions or not.<br>
<br>
2) If the crankshaft was ground to the wrong dimensions, is there a way to<=
br>
fix it (e.g., special seal) short of replacing the crankshaft? Replacement<=
br>
crankshafts are scarce and quite expensive (>USD$1600).<br>
<br>
3) If the crankshaft was ground to the correct dimensions, what have<br>
others done to keep that oil seal conversion from leaking?<br>
<br>
I=E2=80=99d welcome any input from those on this list.<br>
<br>
Dave MacKay<br>
1960 Triumph TR3A, s/n 68639L<br>
near Toronto, Canada<br>
** <a href=3D"mailto:triumphs@autox.team.net"; target=3D"_blank">triumphs@au=
tox.team.net</a> **<br>
<br>
et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/triumphs"; rel=3D"noreferr=
er" target=3D"_blank">http://www.team.net/pipermail/triumphs</a>=C2=A0 <a h=
ref=3D"http://www.team.net/archive"; rel=3D"noreferrer" target=3D"_blank">ht=
tp://www.team.net/archive</a><br>
<br>
hs/jhassall@gmail.com" rel=3D"noreferrer" target=3D"_blank">http://autox.te=
am.net/mailman/options/triumphs/jhassall@gmail.com</a><br>
</blockquote></div><div><br clear=3D"all"></div><div><br></div><span class=
=3D"gmail_signature_prefix">-- </span><br><div dir=3D"ltr" class=3D"gmail_s=
ignature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div=
><div dir=3D"ltr"><div><div><span style=3D"color:rgb(0,0,0);font-family:ari=
al,helvetica,sans-serif;background-color:rgb(250,250,251)">jim=C2=A0 W4BEA<=
/span></div></div></div></div></div></div></div></div></div></div>
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** triumphs@autox.team.net **
Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
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