The component identified as item No.15 is...

The component identified as item No.15 is used to __________. Illustration MO-0016

No comments yet

Be the first to share your thoughts!

🔍 Key Concepts

• Look at how item 15 is linked mechanically to the fuel pump components (plunger, control rod, or fuel supply passage). • Review how a jerk‑type fuel injection pump normally stops fuel delivery (spill ports / control rack) versus how injector popping pressure is tested (separate test stand). • Recall what actually changes timing in a cam‑driven fuel pump versus what changes quantity/stop of fuel delivery.

💭 Think About

• Trace the motion: if you move item 15, which internal parts would it move? Would that motion more likely shut off flow, change injection start timing, or change pressure? • Ask yourself: does the component shown look like something that would be used only in a workshop for testing, or something permanently mounted to control the pump during operation? • Consider whether any external lever can directly ‘increase pressure,’ or whether pressure is mainly a result of plunger size and cam speed, regardless of the lever position.

✅ Before You Answer

• Verify whether item 15 is connected to the injector nozzle body itself (for popping‑pressure testing) or to the pump control/shut‑off mechanism. • Check if moving item 15 would alter the plunger’s effective stroke start (timing) or simply the end of delivery / spill point (quantity/stop). • Confirm that fuel pump delivery pressure in this design is primarily a function of plunger and cam rather than a manual lever, and use that to eliminate options.

🔍 Key Concepts

💭 Think About

✅ Before You Answer