🔍 Key Concepts

• Full floating wristpin design and how it moves relative to piston and connecting rod • Methods used to axially locate (hold in place sideways) a wristpin in an engine • Which choices are used in practice to retain pins versus permanently fixing or sealing parts

💭 Think About

• Think about how a full floating wristpin is supposed to move: where is it free to move and where must it be stopped from moving? • Which of these options would allow the wristpin to rotate freely but keep it from rubbing on the cylinder wall? • Eliminate any options that would permanently lock the pin so it could not "float" in normal engine operation.

✅ Before You Answer

• Verify which method is commonly used as a removable mechanical retainer at the ends of a wristpin bore • Check that the method you choose would still let the pin rotate freely in both the piston and connecting rod • Make sure your choice actually prevents sideways movement into the cylinder wall, not just leakage or a tight fit in one part