| Also known as | E3116 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 22 |
| Subsystem | engine bottom |
| Listed in parts books | 1960–1962 |
Alternator backing washer, B-range
Alternator backing washer for B-range Triumph pre-unit twins, seats under the rotor retaining nut on the crankshaft.
This is the alternator backing washer for B-range Triumph pre-unit twins, part number 70-3116, also listed under the older E3116 number. It shows up in the crankshaft and connecting rods section of the parts book, where it sits with the alternator rotor and its retaining nut on the crankshaft.
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A washer like this backs up the nut that clamps the alternator rotor onto the crankshaft taper, giving the fastener a proper seat so it draws up evenly. It is a small part but it is doing a real job holding the rotor in place, so if yours is worn, bent, or missing, it is worth replacing rather than running without one.
Our catalog record ties this one to B-range pre-unit machines from the early 1960s. If you are not sure your crank and alternator setup match up with this washer, give us a call and we will confirm fitment before you order.
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