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[WPTA] TR6 Timing Chain

To: "wpta@autox.team.net" <wpta@autox.team.net>
Subject: [WPTA] TR6 Timing Chain
From: xj61975--- via Wpta <wpta@autox.team.net>
Date: Fri, 23 May 2025 16:18:35 +0000 (UTC)
Delivered-to: mharc@autox.team.net
Delivered-to: wpta@autox.team.net
References: <2130077765.772652.1748017115617.ref@mail.yahoo.com>
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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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