Question 49Motor Plants - 1st Asst/Chief

The correct answer is A) Intake and exhaust valves closed. When the fuel cam has shifted during maintenance, the intake and exhaust valves should be in the closed position as the engine approaches top dead center for fuel injection. This ensures the correct timing of the fuel pump relative to the piston position, as the valves need to be closed to allow for proper compression and combustion of the fuel-air mixture. The other options are incorrect because: B) has the exhaust valve open, which would disrupt the compression stroke; C) has both valves open, which is the incorrect valve position for the injection timing; and D) has the intake valve open, which would also disrupt the compression stroke.