| Also known as | E4503 |
| Diagram | Fig. 1 — CRANKSHAFT, PISTON AND TIMING GEARS · ref 41 |
| Subsystem | engine bottom |
| Listed in parts books | 1963–1964 |
CRANK SHAFT NUT,T20 LATE LARGE BORE ROTOR (.750)
Crankshaft nut for the T20 with the later large-bore (.750) alternator rotor.
This is the crankshaft nut used on the T20 with the later large-bore alternator rotor (.750). It threads onto the end of the crankshaft and holds the rotor in place, so it takes the clamping load that keeps the rotor from working loose against the crank taper.
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The ".750" callout in the catalog description points to the larger bore rotor fitment, which is how Triumph tells this nut apart from the earlier small-bore version. If you're not sure which rotor bore you're running, check the rotor itself before ordering rather than guessing off the nut alone.
We don't have more detail on this one beyond what's in the parts book listing. Call the shop and we'll confirm fitment before you order if there's any doubt about which crank/rotor combination you've got.
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