🔍 Key Concepts

• Injection pump precision parts (plunger and barrel clearances and matching) • Effects of contamination and damage on fuel injection components • Proper handling and cleanliness procedures for diesel fuel system components

💭 Think About

• Which choice(s) help prevent scratching, dirt intrusion, or mismatch of precision-fitted parts? • What does it mean for plunger and barrel to be a "matched set" in terms of wear and clearances? • Is there any option that seems unrelated to protecting precision fuel system parts or may not be standard practice?

✅ Before You Answer

• Verify how critical cleanliness and matching are for injection pump plungers and barrels in diesel engines. • Check whether immersion in clean diesel fuel serves a purpose during disassembly/assembly, such as lubrication and protection from dirt. • Consider whether the work surface material is actually a key requirement in standard maintenance practice, or if it seems less essential than the others.