| Also known as | E4855 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 36 |
| Subsystem | engine bottom |
| Listed in parts books | 1964–1965 |
EXHAUST CAMSHAFT
Exhaust camshaft for the Triumph twin, listed as 70-4855 (formerly E4855).
70-4855 is the exhaust camshaft as listed in Triumph's parts books, also identified under the earlier E4855 number. It shows up in the CRANKSHAFT AND CONNECTING RODS section of the catalog, and its job is straightforward: it rides in the timing chest and works the exhaust valve gear through its lobe profile as the engine turns.
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Our catalog record for this one covers appearances between 1964 and 1965. If you're matching this against a specific engine, bring in your existing cam or the numbers off your timing cover parts so we can confirm you're getting the right lobe profile and not the intake side by mistake.
Ask at the counter if you want us to check what else in your timing chest should get looked at while you're in there — cams don't wear out alone, and the followers and bushings are worth a look at the same time.
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