| Also known as | T1161 |
| Diagram | Fig. 8 — GEARBOX SHAFTS, BEARINGS AND INNER COVER · ref 39 |
| Subsystem | gearbox |
| Listed in parts books | 1963–1970, 1974 |
Plunger spring
Gearbox plunger spring (57-1161) used with a detent ball or plunger inside the gearbox shafts and inner cover assembly.
This is the plunger spring listed in the catalog under 57-1161, also carried as MT57-1161 and, in the older lettered numbering, T1161. It shows up in the gearbox parts book, specifically in the figures covering the gearbox shafts, bearings, and inner cover as well as the gearbox shafts and gears.
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A plunger spring in this location works with a small ball or plunger to hold a selector or shaft in a detented position inside the gearbox - keeping things located until you shift again. It's a small part but one that's easy to overlook when a gearbox is acting like the selection is loose or imprecise.
The catalog shows this part appearing across a long span of years in Triumph gearbox records, so it's been used across a number of builds over that time. If you're rebuilding a gearbox and pulling the inner cover or shafts, it's worth checking the condition of this spring while you're in there - call the shop if you want help confirming exactly where it seats in your particular gearbox.
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