Diesel Engine Parts, Products

1. Basic Product Parameters

1. Part Number: 4309095
2. Applicable Engine Model: Cummins QSC8.3 diesel engine
3. Kit Composition: Complete piston assembly including piston body, piston pin, piston rings (top compression ring, second compression ring, oil control ring), retaining circlips, pin bushings
4. Piston Material: High-strength cast aluminum alloy, heat-resistant reinforced structure
5. Standard Bore Size: Factory standard bore matching QSC8.3 cylinder liner, no oversize as standard
6. Compression Ratio Matching: Designed for QSC8.3 original factory compression ratio
7. Application Scenarios: Industrial machinery, construction equipment, agricultural tractors, generator sets equipped with QSC8.3 engines
8. Thermal Performance: Anti-ablation, low thermal expansion, adapted to high-load continuous operation

2. Installation Position

This piston kit is installed inside each cylinder of the Cummins QSC8.3 engine cylinder block:

1. Assemble piston rings, piston pin and circlips onto the piston first to form a full piston assembly;
2. Connect the piston assembly to the engine connecting rod via the piston pin;
3. Insert the whole piston & connecting rod assembly into the cylinder liner from the bottom of the cylinder block;
4. Fix the connecting rod onto the engine crankshaft with connecting rod bearings and rod bolts;
5. The top surface of the piston faces the combustion chamber under the cylinder head, matching fuel injectors and intake/exhaust valves.

3. Core Functions

1. Combustion Power Transmission Seal the cylinder combustion chamber. When fuel ignites and expands, high-pressure gas pushes the piston downward, transferring power to the crankshaft through the connecting rod to output mechanical power for equipment driving.
2. Gas Sealing

• Top & second compression rings: Block high-temperature high-pressure combustion gas to prevent gas leakage into the crankcase, guarantee combustion efficiency and engine power output;
• Oil control ring: Scrape excess lubricating oil off the cylinder liner inner wall, stop engine oil from entering the combustion chamber to avoid oil burning, blue smoke and carbon deposit buildup.

1. Heat Dissipation & Thermal Balance The aluminum piston conducts massive heat generated during combustion to cylinder liner and engine cooling system, controlling piston operating temperature to prevent melting, cracking or seizure.
2. Lubrication Control Cooperate with cylinder wall lubrication system to maintain uniform oil film, reduce friction and wear between piston and cylinder liner, extend engine service life.
3. Combustion Chamber Matching The top concave design of the piston forms a standardized combustion chamber with the cylinder head, optimizing fuel atomization and mixing, lowering fuel consumption and exhaust emissions.