Detailed Photos
Installation Instructions
Product Description
369-00040-0
Connecting Rod, Tohatsu,
For Outboard: Tohatsu M5B, M5BS, M4C
Functions:
| 1. Energy Transfer: The primary function of the connecting rod is to convert the linear motion of the piston (as it moves up and down during the power strokes) into the rotational motion of the crankshaft. This rotational motion drives the propeller, propelling the boat forward. |
| 2. Maintaining Piston Alignment: The connecting rod ensures that the piston remains properly aligned in the cylinder. It prevents lateral movement and ensures that the piston moves up and down in a straight path, which is essential for efficient combustion and engine performance. |
| 3. Withstanding High Loads: During each power stroke, the connecting rod experiences intense tensile and compressive forces. It must be able to handle the load created by the combustion pressure, as well as the high-speed motion of the engine's operation. |
| 4. Converting Reciprocating to Rotary Motion: The rod plays a critical role in transforming the reciprocating motion of the piston into the rotational motion of the crankshaft. This is a key process in generating the mechanical power needed to propel the boat. |
Features:
| 1. High Strength and Durability: connecting rods are designed to handle the immense forces created during combustion, as well as the rapid motion of the piston. They are built to withstand the high stress and pressure that occur in the engine without bending, breaking, or suffering from fatigue. |
| 2. Precision Machining: The connecting rods are precision-engineered to ensure a perfect fit between the piston and the crankshaft. This tight tolerance is critical for smooth engine operation and power transfer, minimizing friction and wear. |
| 3. Balanced Design: Proper balancing of the connecting rod is essential for smooth engine operation. We designed our rods to be lightweight yet strong, ensuring the engine operates efficiently with minimal vibration and stress on other components. |
| 4. High Heat Resistance: Due to the extreme heat generated in the combustion chamber, connecting rods are made from materials that can withstand high temperatures without losing strength or structural integrity. |
Size:
| 1. Varies by Engine Model: The size of the connecting rod varies depending on the displacement and power of the outboard motor. |
| 2. Length: The rod's length is typically proportional to the stroke of the engine. Longer rods are used in engines with larger strokes, while shorter rods are used in smaller, high-revving engines. |
| 3. Small-End and Big-End Diameter: The small end of the connecting rod connects to the piston pin, and the big end connects to the crankshaft. Both ends have bearings to reduce friction. |
| 4. Dimensions and Weight: The dimensions of the connecting rod must be optimized for strength while minimizing weight. Heavier rods can cause more wear on the engine components and reduce performance. |
Maintenance Tips:
| 1. Regular Inspection: During routine engine maintenance, inspect the connecting rod for signs of wear, cracking, or damage. Pay special attention to the rod bearings, as wear here can lead to engine failure. |
| 2. Proper Lubrication: Ensure that the engine's lubrication system is functioning properly, as the connecting rod bearings rely on consistent oil flow to reduce friction and wear. Using high-quality marine-grade oil is essential. |
| 3. Check for Rod Play: If the engine starts making knocking noises or you feel excess vibration, there could be excessive play in the connecting rod bearings. This should be addressed immediately to prevent further damage. |
| 4. Replace Worn Bearings: The bearings at both ends of the connecting rod (piston pin and crankshaft) wear out over time. If you notice excessive wear or clearance, replace the bearings to avoid further engine damage. |
| 5. Ensure Proper Torque: If replacing the connecting rod, follow the manufacturer's specifications for torqueing the connecting rod bolts. Incorrect torque can lead to rod failure. |
Common Issues and Symptoms:
| 1. Engine Knocking or Tapping Noise: A worn connecting rod bearing can cause a knocking or tapping noise in the engine, especially under load. This sound occurs due to excessive clearance between the rod and crankshaft. |
| 2. Loss of Power: If the connecting rod is damaged or improperly fitted, it can lead to inefficient power transfer, resulting in a loss of engine power and poor performance. |
| 3. Piston Seizure: If the small end of the rod, where it connects to the piston pin, becomes damaged or the bearing fails, it can cause the piston to seize, leading to severe engine damage. |
| 4. Overheating or Poor Lubrication: Overheating or insufficient lubrication can cause the connecting rod to overheat, warp, or seize. Always ensure the engine is properly lubricated and cooled. |
| 5. Crankshaft Damage: If the connecting rod or its bearings fail, it can lead to severe crankshaft damage, which can be costly to repair. |
More Products We Have:
| Part No. |
Description |
| 369-00030-0 |
Crank Shak |
| 369-00031-0 |
Crank Shaft A |
| 369-00034-0 |
Crank Shak D |
| 369-00061-0 |
Crank Pin |
| 369-00040-0 |
Connecting Rod |
| 369-00043-0 |
Needle Bearing, 20-26-12 |
| 9603-3-6204 |
Ball Bearing, 6204 |
| 369-00115-0 |
Thrust Plate, Crank shaft |
| 369-00122-0 |
Oil Seal, 20-47-8 |
| 350-00042-0 |
Needle Bearing, 14-18-20 |
| 338-00131-0 |
Key, Magneto |
| 369-00001-0 |
Piston (Std) |
| 369-00004-0 |
Piston (0.5mm O/S) |
| 351-00011-0 |
Piston Ring (Std) |
| 351-00014-0 |
Piston Ring (0.5mm O/S) |
| 369-00021-0 |
Piston Pin |
| 350-00024-1 |
Clip, Piston Pin |
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