Direct injection head has flat face. Combustion space is in piston crown. Piston crown recess is shaped to aid swirl during fuel burn less noise stress. Discovery tank unit with fuel level mechanism and submerged lift pump. Removing injection pump involves working timing cover where driven by belt. Glow plugs raise temperatures of air in cylinder to help the fuel ignite during cold starts.TDI injectors are superior to Series III type. Black deposits due to burnt oil poor seals.
Mechanically controlled exhaust gas recirculation (EGR) was introduced, though the system had appeared year’s earlier on Australian specification Series III models. Moves towards electronic control appeared in the 300 TDI Discovery models fitted with Electronic Diesel Control (EDC). These engines were controlled by an engine control Module (ECM) which received signals from engine sensors and dictated timing, the amount of fuel injection and EGR operation.
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