| Also known as | T91 |
| Diagram | Fig. 14 — CHAINCASE AND ALTERNATOR · ref 3 |
| Subsystem | primary |
| Listed in parts books | 1960–1962 |
RETAINING PLATE,PRE-UNIT
A retaining plate for the pre-unit Triumph primary chaincase and alternator assembly.
This is a retaining plate for the pre-unit Triumph primary chaincase, appearing in the catalog under the CHAINCASE AND ALTERNATOR figure. On the older letter-prefix system it was known as T91, which is the same physical part as 57-0091 today.
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As a retaining plate it does the job its name suggests: holding a component in place inside the chaincase assembly, in this case tied to the alternator setup on the primary side. The catalog data we have on it is limited to that figure and the pre-unit era listing, so we can't point to more detail on exact position or what it clamps down without pulling the diagram.
If you're rebuilding a pre-unit chaincase and your parts book calls out T91 or 57-0091, this is the part you're after. Give us a call if you want to confirm it matches what's on your bench before ordering.
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