Cummins Nt855 Engine Valve 135957 Diesel Engine Part

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135957

Cummins, Detroit, DCEC, CCEC, XCEC etc.

Diesel engine, Gas engine, Diesel Generator, Marine engine, Construction engine Pump engine etc.

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The primary function of the valves in the Cummins NT855 engine is to regulate the intake and exhaust processes. Specifically, the valve system comprises intake valves and exhaust valves, which are responsible for introducing air-fuel mixtures into the combustion chamber and expelling post-combustion exhaust gases, respectively. The intake valves facilitate the entry of air into the engine, where it mixes with fuel to form a combustible mixture. Conversely, the exhaust valves ensure the efficient removal of combustion byproducts and contribute to engine cooling.


The core function of intake valves is to control the flow of air into the engine, enabling its mixture with fuel to produce a combustible charge. During the intake stroke, the intake valve opens progressively to allow fresh air from the external environment to enter the engine and combine with the fuel injected by the fuel injector. This process generates an optimal air-fuel mixture that supports efficient combustion. Any malfunction in the intake valve, such as improper timing or insufficient opening, can disrupt the air supply, leading to an imbalanced air-fuel ratio and consequently affecting the engine's power output.


Exhaust valves play a critical role in expelling combustion byproducts and maintaining thermal stability within the engine. After the power stroke, the cylinder contains residual exhaust gases. At this stage, the exhaust valve promptly opens to expel these gases efficiently. Proper exhaust gas removal not only ensures pressure equilibrium within the cylinder but also aids in dissipating heat generated during combustion. If the exhaust valve fails to operate correctly, exhaust gases may accumulate inside the engine, impairing its performance and potentially causing overheating, which could lead to various malfunctions.


The operation of the valves is governed by the camshaft, which precisely controls their opening and closing cycles. The intake valves are actuated by the camshaft, while the exhaust valves rely on the interaction between the exhaust valve spring and valve seat for closure. Accurate synchronization of intake and exhaust timing enhances combustion efficiency and ensures optimal engine performance. Furthermore, the implementation of multi-valve technology improves the engine's breathing capability by optimizing the design of intake and exhaust channels, resulting in faster and more uniform combustion within a compact combustion chamber.

he valve part numbers of the Cummins NT855 engine include:

Valve: Part number is 3803512
Valve assembly: Part numbers are 2881836 and 3803515
These part numbers correspond to the valves and valve assemblies of the Cummins NT855 engine and are suitable for maintenance and replacement of this engine model.