| Also known as | E3222 |
| Diagram | Fig. 3 — CYLINDER BARREL AND HEAD · ref 21 |
| Subsystem | engine top |
| Listed in parts books | 1963–1968 |
Rocker ball pin
Rocker ball pin (70-3222 / E3222) used in the rocker gear atop the cylinder head on several small-frame Triumph twin engines.
This is the rocker ball pin, catalog number 70-3222, also listed under the earlier E3222 form. It shows up across the cylinder head figures for the smaller unit-construction Triumph twins, appearing in head assembly drawings for the 3TA, 5TA, T90, and various T100 variants including the T100S, T100C, T100R, and T100T, single and twin carburetor arrangements alike.
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The ball pin is part of the rocker gear at the top of the cylinder head, working with the rocker arm to transfer valve train motion. It's a small piece but it sits in a wear-prone spot up in the head, and given how many head configurations it turns up in across the parts books, it's worth checking the fit against your specific head casting before ordering.
Given the number of catalog appearances tied to this part number, it's clearly a long-running component across that engine family's head assemblies from the early-to-mid 1960s span shown in our records. Bring your old one to the counter if you're not sure which pin you need — head parts like this can vary more than the number would suggest.
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