[WPTA] TR6 Timing Chain

[Jim Keenan]

Bill,

I personally have never heard of a timing chain jumping a tooth. If that occurred, 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 PM, xj61975--- via Wpta <wpta at autox.team.net> wrote:


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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wpta at autox.team.net

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