| Also known as | E4848 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 36 |
| Subsystem | engine bottom |
| Listed in parts books | 1964–1965 |
Exhaust camshaft
Exhaust camshaft (70-4848, formerly E4848) for the bottom-end timing gear on Triumph twins.
This is the exhaust camshaft, listed in the catalog under 70-4848 with the older E4848 number appearing in earlier parts books for the same piece. It shows up in the crankshaft and connecting rods section of the parts catalog, which is where Triumph groups the bottom-end timing components including the cams.
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The exhaust camshaft controls the opening and closing of the exhaust valves in time with the crankshaft, working alongside its companion inlet cam and the tappets that ride on its lobes. Wear here shows up as noisy valve gear, lost performance, or uneven idle, so it's worth a look whenever the timing chest is open for other work.
Our catalog record ties this part to the 1964-1965 model years across its listed appearances. If you're not sure whether it's the right cam for the engine you're working on, give us a call before ordering and we'll help confirm fitment.
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