| Also known as | T1986 |
| Diagram | Fig. 9 — GEARBOX OUTER COVER · ref 1 |
| Subsystem | gearbox |
| Listed in parts books | 1964–1965, 1967 |
' Gearbox Outer Cover
The outer cover plate that bolts over the gearbox shell on unit-construction Triumph twins, also known by its older T1986 number.
This is the gearbox outer cover, the plate that closes off the outside of the gearbox shell on the unit-construction Triumph twins. It's the panel you look at from the right side of the bike when the primary side is off, bolted over the selector mechanism and mainshaft end to keep the works clean and the oil in.
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In our records this one comes up under the older T1986 designation as well as the current 57-1986 number, so if you're working from an early parts book and see T1986 called out, that's the same physical cover.
Our catalog entry on this one is thin, just the single listing tied to the outer cover figure. If you're not sure this is the right cover for your gearbox casing, give us a call before you order and we'll sort out fitment.
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