The following events occur during the exhaust stroke for any of the cylinders of the 6.5L V8 turbo diesel engine (refer to Figure 1-8):
• At the end of the power stroke, the rotating crankshaft also rotates the camshaft and the exhaust lobe for the cylinder pushes a hydraulic roller lifter upward.
• The lifter operates a rocker arm, using a hollow push rod, which pushes open the exhaust valve.
• As the crankshaft rotates, it pushes the connecting rod/piston for the cylinder in an upward direction.
• The action of the piston pushes post-combustion gases out of the cylinder combustion area through the exhaust system (including the turbocharger).
• At the end of the exhaust stroke, the rotating crankshaft also rotates the camshaft, and the exhaust lobe for the cylinder allows downward movement of a hydraulic roller lifter.
• Exhaust valve spring pressure pushes the exhaust valve closed and also operates the rocker arm, moving the push rod and lifter downward.