| Also known as | E4609 |
| Diagram | Fig. 4 — CYLINDER BLOCK AND HEAD, 6T AND TR6 · ref 36 |
| Subsystem | engine top |
| Listed in parts books | 1964–1965, 1967–1968, 1970–1971 |
CLIP,ROCKER BOX CAP 650 TRIUMPH
Spring clip that secures the rocker box inspection cap on 650 Triumph cylinder heads.
70-4609 is the small spring clip that holds the rocker box inspection cap in place on the cylinder head. It shows up under the CYLINDER BLOCK AND HEAD figures for the 650 twins, covering both 6T and TR6 variants across a run of catalog years, and it's listed under the older E4609 form as well if that's what your book shows.
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The caps over the rocker boxes let you check valve clearances without pulling the whole cover, and this clip is what keeps that cap seated so it doesn't rattle loose or leak oil around the edge. It's a simple, easy-to-lose part - plenty of engines that come through the shop are missing one or more of these.
Given how cheap and common it is for these to go missing over the years, it's worth checking all your rocker caps are actually held down by clips like this one rather than just resting in place.
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