Lycoming Cylinder #3 & #4 Oil Drain Tube Assembly | Fits O-320, O-360, O-540, IO-320, IO-360 & IO-540

The 68761 Oil Drain Tube Assembly is a precision-formed replacement tube designed for Cylinder #3 and Cylinder #4 on select Lycoming aircraft engines equipped with external cylinder oil drain systems. Engineered to provide proper oil return from the cylinder head to the crankcase, this tube helps maintain efficient lubrication while preventing leaks caused by damaged or deteriorated oil drain tubes.

Manufactured from corrosion-resistant steel tubing, the 68761 is built to withstand the heat, vibration, and demanding operating conditions of aircraft engines. It is an ideal replacement during routine maintenance, engine repair, or overhaul.

Features

• Direct replacement for Cylinder #3 & #4 oil drain tubes
• Precision-formed for proper fit and routing
• Corrosion-resistant steel construction
• Ensures efficient oil return to the crankcase
• Leak-resistant design for dependable performance
• Ideal for maintenance, repair, and engine overhaul

Specifications

• Part Number: 68761
• Description: Cylinder #3 & #4 Oil Drain Tube Assembly
• Cylinder Location: #3 or #4
• Material: Corrosion-resistant steel
• Condition: New

Common Applications

The 68761 Cylinder #3 & #4 Oil Drain Tube Assembly fits selected Lycoming engines equipped with external cylinder oil drain tube assemblies, including:

• AEIO-360: -B1G6, -H1A
• AEIO-540: -D4A5, -D4B5
• AIO-320: -B1B, -C1B
• HIO-360: -B1A
• HO-360: -B1A, -B1B, -C1A
• IO-320: -B1A, -B1C, -C1A, -D1A, -D1B, -E1A, -E1B, and additional models
• IO-360: -B1A, -B1B, -B1D, -B1E, -B1F, -B1G6, -B2, and additional models
• IO-540: -C1B5, -C4B5, -C4C5, -C4D5D, -D4A5, -G1A, and additional models
• LIO-320: -B1A, -C1A
• LO-360: -A1G6D, -A1H6
• O-320: -A2A, -A2B, -A2C, -A2D, -A3A, -A3B, -A3C, and additional models
• O-360: -A1A, -A1AD, -A1C, -A1D, -A1F6, -A1F6D, and additional models
• O-540: -A1A, -A1A5, -A1B5, -A1C5, -A1D, -A1D5, and additional models
• TIO-540: -C1A, -E1A, -G1A, -H1A, -AA1AD, -AB1AD, and additional models

Note: The 68761 is used on Cylinder #3 and Cylinder #4 (one tube per cylinder) depending on the engine configuration.