Subtopic: I.C. engine systems – fuel, cooling, lubrication, ignition, electrical, intake and exhaust
Question Statement:
Which of the following components are essential functional elements of an in-line fuel injection pump (FIP) used in multi-cylinder tractor diesel engines?
Options:
(A) Lapped plunger and barrel assembly with helical metering groove
(B) Camshaft and roller tappets to actuate high-pressure pumping strokes
(C) Constant-pressure delivery valve with retraction (anti-dribble) collar
(D) Centrifugal mechanical governor to regulate fuel rack position according to engine load
Answer Key:
A, B, C, D
Step-by-Step Solution & Explanation
All listed elements are vital parts of an in-line jerk-type FIP:
- Plunger and barrel with helix control fuel delivery volume via rack rotation.
- Internal camshaft drives plungers in firing order.
- Delivery valve retraction collar relieves line pressure immediately upon cut-off, causing sharp nozzle needle seating and preventing nozzle dribble.
- Governor balances flyweight centrifugal force against speed-setting spring to govern idle and maximum speed.