Wristpin bearings are difficult to lubricate...

Wristpin bearings are difficult to lubricate...

Question 1 of 270705eccefa1bacbc34ba4d475c1

Wristpin bearings are difficult to lubricate because of their oscillating motion and __________.

Question 1 of 27070

Q

Wristpin bearings are difficult to lubricate because of their oscillating motion and __________.

🔍 Key Concepts

• Wristpin (gudgeon pin) function and location in a piston engine • How oscillating motion affects formation of a continuous oil film • Which factor makes it hard for oil to stay between two surfaces that rock back and forth a short distance

💭 Think About

• Think about what lubrication needs in order to form a stable oil film between moving parts. Which condition here interferes with that the most? • Which answer choice is simply another way of describing the piston’s motion, and which one directly affects the bearing’s ability to receive or retain oil? • Consider where the wristpin is located inside the engine and how oil actually reaches it—does its motion or its location create the bigger challenge?

✅ Before You Answer

• Compare oscillating vs. rotating motion and how each affects oil film continuity. • Mentally trace the oil flow path from pump to wristpin—does the design rely on splash, pressure, or both? • Ask yourself which option would be specifically mentioned in textbooks as the classic reason wristpin bearings are hard to lubricate, beyond just "they move."