| Diagram | Fig. 4 — Engine: Contact Breaker, Timing Cover, Oil Pump, Oil Pressure Relief Valve · ref 40 |
| Subsystem | engine bottom |
| Listed in parts books | 1975 |
Norton 'O' Ring
An 'O' ring sealing a joint in the timing cover/oil pump area of the engine.
This is an 'O' ring listed against the timing cover and oil pump area of the engine, appearing in the catalog alongside the contact breaker, timing cover, oil pump, and oil pressure relief valve figures. It's a small sealing ring that keeps oil where it belongs at one of the joints or plugs in that part of the motor.
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The catalog record for this one is thin - just the one appearance, tied to 1975. Given the figure grouping, it's likely sealing against a plug or cover fastener in that timing-side area, but we don't have enough in our records to pin down exactly which joint it seals.
If you're chasing an oil leak around the timing cover or oil pump on a bike from this era, it's worth having a couple of these on hand, but call the shop and we'll confirm exactly where it goes before you order.
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