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An inflator stem is not used; instead, a removable cap on a valve stem embedded in the tire rim is fitted, with only the cap visible. When inflating the tire, the cap is first removed, typically with a coin, and then a "portable" dedicated inflator stem is screwed onto the valve stem. Through the inflator, the tire is inflated as usual.
The upper part of the valve stem, within the rocker box, is lubricated by oil. If this oil travels unchecked along the valve stem, engine HC emissions will become excessive. To control this, an elastomeric seal is fitted over the top of the valve guide. These may wear or stiffen with age, so are usually replaced whenever valves are removed for ...
The Fairlady Z was introduced in late 1969 as a 1970 model, with the L20 2.0-liter straight-six SOHC engine, rear-wheel drive, and a stylish and sleek coupe body. In Japanese specs the engine, based on the Datsun 510's four-cylinder, produced 130 PS (96 kW; 128 hp) JIS and came with a four- or a five-speed manual transmission.