Turbocharging

The last J-type engines were turbocharged on the constant pressure system following a changeover from the original impulse charging system. Three- and four-cylinder engines have only one turbocharger, mounted at the forward or aft end, while two or three chargers have been fitted to seven-, eight- and nine-cylinder engines. Between each turbocharger and the engine entablature is a finned-tubed seawater-cooled aftercooler. An electric auxiliary blower is provided for slow running or emergency duties.

Starting of the engine is by compressed air, which is admitted to the cylinders through pneumatically operated valves (Figures 14.12 and

Figure 14.15 Diagrammatic arrangement of speed controls and other pneumatic controls, including remote control
Figure 14.16 Cutaway drawing of a 58JS3C engine

14.13). The valves are controlled by a rotary air distributor driven from the camshaft to govern the timing and duration of opening for starting the engine ahead or astern. Levers for starting and speed control are grouped in a control box near the engine; when bridge controls are fitted pneumatic valves to control engine movements are actuated by moving the bridge telegraph (Figure 14.15). C.T.W.

Do It Yourself Car Diagnosis

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