| Diagram | Fig. 1 — Engine: Crankshaft, Connecting Rods, Pistons, Camshaft, Timing Gear · ref 13 |
| Subsystem | engine bottom |
| Listed in parts books | 1975 |
Norton Key, Timing Pinion
A small locating key for the timing pinion/gear on a Norton engine, keeping it fixed to its shaft.
This is a small key that locates the timing pinion (or timing gear/cam, depending on which figure you're working from) onto its shaft, keeping it from spinning independently of the crank or camshaft it's fitted to. It shows up in the crankshaft, connecting rods, pistons, camshaft and timing gear section of the engine parts book, so it's a bottom-end timing component rather than anything on the top end.
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Our catalog record for this one is thin - a single listing, tied to 1975 in the appearances we have on file. Given the manufacturer code on this part, it's worth confirming this is actually going onto a Norton engine rather than assuming it crosses over to a Triumph application.
Keys like this are easy to lose track of during a rebuild since they're small and easy to drop into the sump or the bench clutter. If you're pulling the timing gear or pinion off, it's worth having a spare on hand rather than trying to reuse one that's already taken a set.
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