Subject: [WPTA] TR6 Timing Chain

From: xj61975--- via Wpta <[email-masked]>
Date: Fri, 23 May 2025 16:18:35 +0000 (UTC)

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I'm evaluating the timing chain on my TR6 powered TVR as I work through changing the front crankshaft seal. I found that the scribed lines and punch marks are not aligning after turning the crankshaft clockwise to the TDC position. It appears that the camshaft is off, retarded by one tooth. Though easy to resolve at this stage, I have to wonder whether it jumped a tooth on its own, or was put together incorrectly by a previous owner. My double row timing chain has +/_ 3/8" slack at mid span on the tensioner side, which does not seem to be extreme. Has anyone known one of these to jump time on its own? Any guidance will be welcomed. Thanks
Bill Cooper
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<html><head></head><body><div class="yahoo-style-wrap" style="font-family:arial;font-size:16px;"><div dir="ltr" data-setdir="false">I'm evaluating the timing chain on my TR6 powered TVR as I work through changing the front crankshaft seal. I found that the scribed lines and punch marks are not aligning after turning the crankshaft clockwise to the TDC position. It appears that the camshaft is off, retarded by one tooth. Though easy to resolve at this stage, I have to wonder whether it jumped a tooth on its own, or was put together incorrectly by a previous owner. My double row timing chain has +/_ 3/8" slack at mid span on the tensioner side, which does not seem to be extreme. Has anyone known one of these to jump time on its own? Any guidance will be welcomed. Thanks</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Bill Cooper</div></div></body></html>
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From: Jim Keenan via Wpta <[email-masked]>
Date: Mon, 26 May 2025 11:20:10 +0000

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From: "Daryl W. Wagner via Wpta" <[email-masked]>
Date: Mon, 26 May 2025 17:35:17 +0000 (UTC)

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Good Morning Bill
As a restoration shop who build motors, I concur with Jim.

Daryl W. Wagner

Automotive Artistry
British Car and Bike
Restoration, Sales and Service
10,000 Aurora Hudson Road

Building Two, Suite B
Hudson, Ohio 44236
330-554-4333

=20

    On Monday, May 26, 2025 at 07:25:11 AM EDT, Jim Keenan via Wpta <wpta@a=
utox.team.net> wrote: =20
=20
=20

Bill,
I personally have never heard of a timing chain jumping a tooth. If that oc=
curred, most likely, there would be damage on one of the gears or the chain=
. Most likely it was installed incorrectly.
Jim Keenan
Sent from my iPhone

On May 23, 2025, at 12:28=E2=80=AFPM, xj61975--- via Wpta <[email-masked].=
net> wrote:

=EF=BB=BFI'm evaluating the timing chain on my TR6 powered TVR as I work th=
rough changing the front crankshaft seal. I found that the scribed lines an=
d punch marks are not aligning after turning the crankshaft clockwise to th=
e TDC position. It appears that the camshaft is off, retarded by one tooth.=
 Though easy to resolve at this stage, I have to wonder whether it jumped a=
 tooth on its own, or was put together incorrectly by a previous owner. My =
double row timing chain has +/_ 3/8" slack at mid span on the tensioner sid=
e, which does not seem to be extreme. Has anyone known one of these to jump=
 time on its own? Any guidance will be welcomed. Thanks
Bill Cooper_______________________________________________
[email-masked]

http://www.wptriumph.org

m

http://www.wptriumph.org

[email-masked]

 =20
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<html><head></head><body><div class=3D"ydpcbe438f5yahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px=
;"><div><div dir=3D"ltr" data-setdir=3D"false">Good Morning Bill</div><div =
dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D=
"false">As a restoration shop who build motors, I concur with Jim.</div><di=
v><br></div><div class=3D"ydpcbe438f5signature"><p><font size=3D"2"><span s=
tyle=3D"font-family:bookman old style, new york, times, serif;"><span style=
=3D"font-style:italic;"><span style=3D"font-family:tahoma, new york, times,=
 serif;"><font size=3D"3" style=3D"background-color: inherit;"><span style=
=3D"font-family:times new roman, new york, times, serif;">Daryl W. Wagner<b=
r><br></span></font></span></span></span></font><font size=3D"2"><span styl=
e=3D"font-family:bookman old style, new york, times, serif;"><span style=3D=
"font-style:italic;"><span style=3D"font-family:tahoma, new york, times, se=
rif;"><font size=3D"3" style=3D"background-color: inherit;"><span style=3D"=
font-family:times new roman, new york, times, serif;">Automotive Artistry<b=
r>British Car and Bike<br>Restoration, Sales and Service<br>10,000 Aurora H=
udson Road</span></font></span></span></span></font></p><p><font size=3D"2"=
><span style=3D"font-family:bookman old style, new york, times, serif;"><sp=
an style=3D"font-style:italic;"><span style=3D"font-family:tahoma, new york=
, times, serif;"><font size=3D"3" style=3D"background-color: inherit;"><spa=
n style=3D"font-family:times new roman, new york, times, serif;">Building T=
wo, Suite B</span></font></span></span></span></font><font size=3D"2"><span=
 style=3D"font-family:bookman old style, new york, times, serif;"><span sty=
le=3D"font-style:italic;"><span style=3D"font-family:tahoma, new york, time=
s, serif;"><font size=3D"3" style=3D"background-color: inherit;"><span styl=
e=3D"font-family:times new roman, new york, times, serif;"><br>Hudson, Ohio=
 44236<br>330-554-4333<br></span><br><br></font></span></span><span style=
=3D"font-family:garamond, new york, times, serif;"></span><br></span></font=
></p><font size=3D"2"><span style=3D"font-family:bookman old style, new yor=
k, times, serif;"></span></font></div></div>
        <div><br></div><div><br></div>
       =20
        <div id=3D"ydpcbe438f5yahoo_quoted_8835093117" class=3D"ydpcbe438f5=
yahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;">
               =20
                <div>
                    On Monday, May 26, 2025 at 07:25:11 AM EDT, Jim Keenan =
via Wpta &lt;[email-masked]&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div id=3D"ydpcbe438f5yiv7492864058"><div>
<div><br clear=3D"none">
</div>
<div><br clear=3D"none">
</div>
Bill,
<div><br clear=3D"none">
</div>
<div>I personally have never heard of a timing chain jumping a tooth. If th=
at occurred, most likely, there would be damage on one of the gears or the =
chain. Most likely it was installed incorrectly.</div>
<div><br clear=3D"none">
</div>
<div>Jim Keenan<br clear=3D"none" id=3D"ydpcbe438f5yiv7492864058lineBreakAt=
BeginningOfSignature">
<div dir=3D"ltr">Sent from my iPhone</div>
<div dir=3D"ltr"><br clear=3D"none">
<blockquote type=3D"cite">On May 23, 2025, at 12:28=E2=80=AFPM, xj61975--- =
via Wpta &lt;[email-masked]&gt; wrote:<br clear=3D"none">
<br clear=3D"none">
</blockquote>
</div>
<blockquote type=3D"cite">
<div dir=3D"ltr">=EF=BB=BF
<div id=3D"ydpcbe438f5yiv7492864058yqt62843" class=3D"ydpcbe438f5yiv7492864=
058yqt7288104234"><div style=3D"font-family:arial;font-size:16px;" class=3D=
"ydpcbe438f5yiv7492864058yahoo-style-wrap">
<div dir=3D"ltr">I'm evaluating the timing chain on my TR6 powered TVR as I=
 work through changing the front crankshaft seal. I found that the scribed =
lines and punch marks are not aligning after turning the crankshaft clockwi=
se to the TDC
 position. It appears that the camshaft is off, retarded by one tooth. Thou=
gh easy to resolve at this stage, I have to wonder whether it jumped a toot=
h on its own, or was put together incorrectly by a previous owner. My doubl=
e row timing chain has +/_ 3/8"
 slack at mid span on the tensioner side, which does not seem to be extreme=
. Has anyone known one of these to jump time on its own? Any guidance will =
be welcomed. Thanks</div>
<div dir=3D"ltr"><br clear=3D"none">
</div>
<div dir=3D"ltr">Bill Cooper</div>
</div></div>
<span>_______________________________________________</span><br clear=3D"no=
ne">
<span>[email-masked]</span><br clear=3D"none">
<span></span><br clear=3D"none">
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</div>
</blockquote>
</div>
</div></div><div class=3D"ydpcbe438f5yqt7288104234" id=3D"ydpcbe438f5yqt209=
98">_______________________________________________<br clear=3D"none"><a sh=
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