Question 20 MODE01 - Chief MODU Engineer

The Correct Answer is C ### Why Option C ("connecting rod bushing") is correct: The illustration MO-0040 typically depicts a connecting rod assembly or components. The part labeled "G" is located at the **small end** (or piston pin end) of the connecting rod. This small end connects the connecting rod to the piston via the piston pin (or wrist pin). To allow for rotational movement between the connecting rod and the piston pin and to provide a renewable wear surface, a specialized friction-reducing cylindrical insert is press-fitted into the bore of the small end. This insert is correctly termed the **connecting rod bushing** (sometimes called the piston pin bushing or small end bushing). ### Why the other options are incorrect: **A) piston bushing:** This term is technically synonymous with the connecting rod bushing, as it is the part that bushes the piston pin. However, in standard engine terminology literature (especially in certifications or tests referencing engine parts), the part is more precisely and commonly identified as the **connecting rod bushing** because it is a component of the connecting rod itself. Therefore, C is the superior and standard answer. **B) connecting rod cap:** The connecting rod cap is the removable lower section of the connecting rod that secures the **big end** (crankshaft end) around the crankshaft journal. It holds the bearing shells in place and is not the part labeled "G" at the small end. **D) bearing shell:** Bearing shells (or insert bearings) are used at the **big end** of the connecting rod (where it meets the crankshaft) to support the main load and are typically split, semi-cylindrical pieces. They are not the single, solid cylindrical bushing used at the small end ("G").