4942139
Cylinder Head
Cummins®

Introduction

The 4942139 Cylinder Head, manufactured by Cummins, is a critical component in heavy-duty truck engines, ensuring efficient and reliable engine performance.

Basic Concepts of a Cylinder Head

A cylinder head is a vital part of an internal combustion engine, covering the cylinders and performing several key functions:

• Providing a seal for the combustion chamber.
• Allowing the intake and exhaust of gases.
• Housing the valves and their operating mechanisms ¹.

It works in conjunction with other engine components like pistons, camshaft, and fuel injection system to facilitate combustion.

Purpose of the 4942139 Cylinder Head

This Cummins part is essential for the operation of truck engines. It:

• Seals the combustion chamber.
• Ensures precise timing of valve operation.
• Manages the flow of exhaust gases and intake air ².

Key Features

The 4942139 Cylinder Head is designed with features that enhance performance and durability:

• Precision-machined valve seats for a tight seal.
• Optimized combustion chamber design.
• Cooling passages for temperature management ³.

Benefits

This part offers several advantages:

• Improved engine efficiency through optimized combustion.
• Enhanced power output.
• Robust design for reliability under demanding conditions.

Installation and Compatibility

Proper installation is crucial for optimal performance. It requires:

• Careful alignment.
• Torquing to manufacturer’s specifications.

This cylinder head is compatible with specific Cummins engine models.

Maintenance and Troubleshooting

Regular maintenance is essential for longevity:

• Check for wear on valve seats.
• Ensure cooling passages are clear.

Common issues include valve leakage or combustion chamber damage, which can be addressed through inspection and repair.

Performance Enhancements

Modifications can be made for enhanced performance:

• Porting for improved airflow.
• Upgrading valve materials.
• Modifying the combustion chamber.

These should be done cautiously and with expert consultation.

Cummins Corporation

Cummins is renowned for its innovation and quality in engine manufacturing, with a strong reputation in the automotive and heavy-duty truck sectors.

Compatibility of 4942139

This part is compatible with various Cummins engines, including:

• ISL CM2150 and ISL9 CM2150 SN.
• L8.9 L121.
• QSC8.3 CM850 (CM2850).

Role in Engine Systems

The 4942139 Cylinder Head is integral to engine performance:

• Houses spark plugs, fuel injectors, and valves.
• Seals cylinders and provides a combustion chamber.
• Contains passages for coolant and oil.
• Works with pistons and crankshaft for power output.

Conclusion

The 4942139 Cylinder Head is a sophisticated component that plays a crucial role in the combustion process, valve operation, and fluid dynamics within the engine system. Its design and material significantly affect engine efficiency and durability.