| Diagram | Fig. 1 — Engine: Crankshaft, Connecting Rods, Pistons, Camshaft, Timing Gear · ref 35 |
| Subsystem | engine bottom |
| Listed in parts books | 1975 |
Norton Circlip
A wrist pin (piston pin) retaining circlip for a Norton engine, 1975 catalog listing.
This is a circlip that lives in the piston, retaining the wrist pin (gudgeon pin) in place inside the piston boss. It shows up in the crankshaft, connecting rods, pistons, camshaft, and timing gear section of the parts book, which is where you'd expect a piston-pin retainer to be listed.
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The manufacturer tag on this one points to Norton rather than Triumph, and the catalog description is just "Circlip" with no further detail on size or material. Given how these little clips work across the industry, its job is straightforward: it stops the wrist pin from walking sideways and scoring the cylinder bore.
Our record only shows this part turning up once in the catalog, tied to the 1975 model year, so we don't have much more to go on. Call the shop and we'll confirm fitment before you order.
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