Subject: [Fot] Too much clearance on distributor drive gear

From: timmmurphh--- via Fot <[email-masked]>
Date: Mon, 18 Mar 2019 15:30:46 -0500

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On page 1.130 and 1.131 of the Workshop Manual it describes the procedure
for obtaining the correct clearance or float for the distributor gear driven
by the camshaft.  It gives two scenarios: one where there is interference of
the gear and the bushing; and a second where there is not enough clearance
or float.  What it doesn't consider is if there is too much clearance
between the gear and the bushing.  That is the case on my TR4 engine.  I had
0.016 clearance and added a 0.010 shim under the gear to get the desired
0.006 clearance.  Has anybody else had this experience?  And what did you do
about it.

Tim Murphy

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link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal>On page 1.130 and 1.131 of the Workshop Manual it =
describes the procedure for obtaining the correct clearance or float for =
the distributor gear driven by the camshaft.&nbsp; It gives two =
scenarios: one where there is interference of the gear and the bushing; =
and a second where there is not enough clearance or float.&nbsp; What it =
doesn&#8217;t consider is if there is too much clearance between the =
gear and the bushing.&nbsp; That is the case on my TR4 engine.&nbsp; I =
had 0.016 clearance and added a 0.010 shim under the gear to get the =
desired 0.006 clearance.&nbsp; Has anybody else had this =
experience?&nbsp; And what did you do about it.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Tim =
Murphy<o:p></o:p></p></div></body></html>
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_______________________________________________
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http://www.fot-racing.com

Archive: http://www.team.net/pipermail/fot

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---

From: fubog1 via Fot <[email-masked]>
Date: Tue, 19 Mar 2019 18:02:17 +0000 (UTC)

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 Yes it has to be pressed/driven out from the bottom, they're a pretty tigh=
t fit.Also over the years I've run into several replacement bushes with the=
 ID & OD bore axis slightly off, enough to cause misalignment on the oil pu=
mp drive end with the pump fitted up, so that's another point to pay close =
attention to when replacing them...Glen
=20
=20
-----Original Message-----
From: John Styduhar via Fot <[email-masked]>
To: Robert Lang <[email-masked]>
Cc: Triumph 'Friends of Triumph <[email-masked]>
Sent: Tue, Mar 19, 2019 12:56 pm
Subject: Re: [Fot] Too much clearance on distributor drive gear

I'm pretty sure you have to remove the bushing from the bottom, but there m=
ay be a chance to remove from the topside with an inside bearing puller/sli=
de hammer.=C2=A0 Do not drop the little woodruff key into the engine.

On Tue, Mar 19, 2019 at 9:40 AM Robert Lang via Fot <[email-masked]> wr=
ote:

 Hi - if the bushing is worn, it needs to be replaced. I would not run the =
gear with a thin shim under it, the shim will not last. I just looked at Mo=
ss and they have that distributor bushing listed for $75 plus or minus.
If you have slop with that distributor drive, you will never get the igniti=
on timing to be rock solid.
Regards,Bob Lang

    On Tuesday, March 19, 2019, 12:36:30 AM EDT, timmmurphh--- via Fot <fot=
@autox.team.net> wrote: =20
=20
 On page 1.130 and 1.131 of the Workshop Manual it describes the procedure =
for obtaining the correct clearance or float for the distributor gear drive=
n by the camshaft.=C2=A0 It gives two scenarios: one where there is interfe=
rence of the gear and the bushing; and a second where there is not enough c=
learance or float.=C2=A0 What it doesn=E2=80=99t consider is if there is to=
o much clearance between the gear and the bushing.=C2=A0 That is the case o=
n my TR4 engine.=C2=A0 I had 0.016 clearance and added a 0.010 shim under t=
he gear to get the desired 0.006 clearance.=C2=A0 Has anybody else had this=
 experience?=C2=A0 And what did you do about it. =C2=A0Tim Murphy__________=
_____________________________________
[email-masked]

@yahoo.com

il.com

m

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<font color=3D'black' size=3D'2' face=3D'Arial, Helvetica, sans-serif'>
<div> <font size=3D"2">Yes it has to be pressed/driven out from the bottom,=
 they're a pretty tight fit.</font></div>

<div><font size=3D"2">Also over the years I've run into several replacement=
 bushes with the ID &amp; OD bore axis slightly off, enough to cause misali=
gnment on the oil pump drive end with the pump fitted up, so that's another=
 point to pay close attention to when replacing them...</font></div>

<div><font size=3D"2">Glen</font><br>
</div>

<div> <br>
</div>

<div> <br>
</div>

<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: John Styduhar via Fot &lt;[email-masked]&gt;<br>
To: Robert Lang &lt;[email-masked]&gt;<br>
Cc: Triumph 'Friends of Triumph &lt;[email-masked]&gt;<br>
Sent: Tue, Mar 19, 2019 12:56 pm<br>
Subject: Re: [Fot] Too much clearance on distributor drive gear<br>
<br>

<div id=3D"yiv2779117632">
<div>
<div dir=3D"ltr">
<div class=3D"yiv2779117632gmail_default" style=3D"font-size:small;">I'm pr=
etty sure you have to remove the bushing from the bottom, but there may be =
a chance to remove from the topside with an inside bearing puller/slide ham=
mer.&nbsp; Do not drop the little woodruff key into the engine.</div>

<div class=3D"yiv2779117632gmail_default" style=3D"font-size:small;"><br cl=
ear=3D"none"></div>
</div>
<br clear=3D"none">
<div class=3D"yiv2779117632gmail_quote">
<div class=3D"yiv2779117632yqt6351613948" id=3D"yiv2779117632yqt33204">
<div class=3D"yiv2779117632gmail_attr" dir=3D"ltr">On Tue, Mar 19, 2019 at =
9:40 AM Robert Lang via Fot &lt;<a rel=3D"noopener noreferrer" shape=3D"rec=
t" ymailto=3D"mailto:[email-masked]" target=3D"_blank" href=3D"mailto:f=
[email-masked]">[email-masked]</a>&gt; wrote:<br clear=3D"none"></di=
v>
<blockquote class=3D"yiv2779117632gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div>
<div class=3D"yiv2779117632gmail-m_-4252127906334782226ydp458ed572yahoo-sty=
le-wrap">
<div></div>

       =20
<div>Hi - if the bushing is worn, it needs to be replaced. I would not run =
the gear with a thin shim under it, the shim will not last. I just looked a=
t Moss and they have that distributor bushing listed for $75 plus or minus.=
</div>

<div><br clear=3D"none"></div>

<div>If you have slop with that distributor drive, you will never get the i=
gnition timing to be rock solid.</div>

<div><br clear=3D"none"></div>

<div>Regards,</div>

<div>Bob Lang<br clear=3D"none"></div>

<div><br clear=3D"none"></div>

       =20
        </div>

<div class=3D"yiv2779117632gmail-m_-4252127906334782226yahoo_quoted" id=3D"=
yiv2779117632gmail-m_-4252127906334782226yahoo_quoted_3805613488">
           =20
<div>
               =20
               =20
<div>
                    On Tuesday, March 19, 2019, 12:36:30 AM EDT, timmmurphh=
--- via Fot &lt;<a rel=3D"noopener noreferrer" shape=3D"rect" ymailto=3D"ma=
ilto:[email-masked]" target=3D"_blank" href=3D"mailto:[email-masked]=
t">[email-masked]</a>&gt; wrote:
                </div>

               =20
<div><br clear=3D"none"></div>

               =20
<div><br clear=3D"none"></div>

               =20
<div>
<div id=3D"yiv2779117632gmail-m_-4252127906334782226yiv8221197969">
<div>
<div class=3D"yiv2779117632gmail-m_-4252127906334782226yiv8221197969WordSec=
tion1">
<div class=3D"yiv2779117632gmail-m_-4252127906334782226yiv8221197969MsoNorm=
al">On page 1.130 and 1.131 of the Workshop Manual it describes the procedu=
re for obtaining the correct clearance or float for the distributor gear dr=
iven by the camshaft.&nbsp; It gives two scenarios: one where there is inte=
rference of the gear and the bushing; and a second where there is not enoug=
h clearance or float.&nbsp; What it doesn=E2=80=99t consider is if there is=
 too much clearance between the gear and the bushing.&nbsp; That is the cas=
e on my TR4 engine.&nbsp; I had 0.016 clearance and added a 0.010 shim unde=
r the gear to get the desired 0.006 clearance.&nbsp; Has anybody else had t=
his experience?&nbsp; And what did you do about it.</div>

<div class=3D"yiv2779117632gmail-m_-4252127906334782226yiv8221197969MsoNorm=
al"> &nbsp;</div>

<div class=3D"yiv2779117632gmail-m_-4252127906334782226yiv8221197969MsoNorm=
al">Tim Murphy</div>
</div>
</div>
</div>
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