| Also known as | GAS 3, GAS-3, T1226 |
| Diagram | CHAINCASE AND ALTERNATOR |
| Subsystem | primary |
| Listed in parts books | 1960–1962 |
PRIMARY GASKET-6T 1954-62 TRIUMPH PU ALTERNATOR CASE
Primary chaincase cover gasket for pre-unit Triumph twins with the alternator-type case, 1954-62.
This is the primary cover gasket for pre-unit Triumph twins running the alternator-equipped case, listed for the 1954-62 span in the catalog. It seals the joint between the primary chaincase outer cover and the case body, keeping oil in and dirt out where the primary chain, clutch, and alternator stator live.
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The legacy part number for this one is GAS 3 (also written GAS-3), which some older parts books and price lists still use, so if you're cross-checking against an older Triumph parts book you may see it under that stamp instead of 57-1226.
We don't have much more history logged on this one beyond the catalog listing itself. If you're not certain your primary case is the alternator-equipped pre-unit type, give us a call before ordering so we can confirm you're getting the right gasket for your case.
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