| Diagram | Fig. 7 — GEARBOX AND CASING · ref 15 |
| Subsystem | gearbox |
| Listed in parts books | 1960–1962 |
LEVEL PLUG 3/8-16BSW
A 3/8-16 BSW level plug for checking or setting oil level in a gearbox or case, later superseded by 21-0046.
S46-15 is a level plug, threaded 3/8-16 BSW. It's a small screw-in plug used to check or set fluid level in an oil-bearing casing, with the BSW thread pointing to older Triumph gearbox and case work rather than a modern fitting.
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Our catalog record on this one is brief, and we don't have appearance history tying it to a specific model or year range. What we do know is that the factory eventually replaced this part number with 21-0046, so if you're working from a later parts book, that's the number you'll find it under.
If you're not sure whether this is the plug your casing takes, call the shop with what you're working on and we'll confirm before you order.
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