| Also known as | E3253 |
| Diagram | Fig. 4 — CYLINDER BLOCK AND HEAD, 6T AND TR6 · ref 48 |
| Subsystem | engine top |
| Listed in parts books | 1960–1971 |
Sealing ring
A sealing ring for the cylinder head/rocker area, cataloged as 70-3253 (also E3253) across a wide range of Triumph twin-cylinder head figures.
This is the sealing ring listed under Triumph part number 70-3253, also found in older parts books as E3253. It shows up across a long run of cylinder block and head figures spanning the 6T, TR6, T120, T90, T100 and 3TA/5TA families, along with rocker box listings, which tells you it's a small sealing component used in the top-end area rather than something specific to one model.
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Given the figure titles this ring works somewhere in the cylinder head or rocker gear to keep oil where it belongs and keep the outside world out. It's a low-cost part that's easy to overlook until you're mid-rebuild and find the old one hardened or split.
With 51 catalog appearances across a decade of production, this is clearly a part that stayed common across multiple engine families, but our records don't spell out the exact bore, groove, or shaft it seals against. If you're matching it to a specific head or rocker spindle, check the physical part against what you've pulled off the bike, or give us a call and we'll help confirm.
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