High Quality Aftermarket 3646323 Cylinder Head Assy For Cummins K19 KTA19 K38 KTA38 Engine

Desc.

Cylinder Head

Part No/TC type

3646323

Brand Name

Man, ABB, PBS, KBB, Napier MET, Weicai, JTH

Other parts

pls contact freely
if you need other P/N

Engine Type

Diesel engine,Gas engine,
Diesel Generators etc.

Spare Type

Cartridge, Nozzle ring , shaft, rotor complete, compressor wheel, diffuser, turbine casing , compressor casing , bearing casing, turbine blades, bearing

Condition:

Original , brand new, OEM, replacement, refurbished

Applicable industry

Marine engines,
Construction works ,oil platform
Energy & Mining etc

Key Word:

Original spare parts
and engine repair tool kits

Trade terms

FOB EXW CIF DDU DDP,

Door to door is available in some countries.

Delivery time:

Most parts are in stock, bulk order based on qty

Payment

T/T, L/C,D/A, Alipay, Western Union, Paypal etc.

Place of origin

China/Germany/South Korea USA/Japan/Sweden /UK/Singapore/Taiwan

Package

Neutral or original packaging

About the product

The cylinder head is a critical structural component of internal combustion engines, responsible for sealing the combustion chamber and accommodating key operational elements. Typically manufactured from cast iron or aluminum alloy, it is mounted atop the cylinder block and forms the combustion chamber in conjunction with the piston [1] [3]. Integrated within its structure are water jackets, valve guide bores, and cooling fins, which collectively support functions such as sealing, valve mechanism installation, and thermal dissipation. In certain advanced designs, the camshaft support bearings are incorporated into the cylinder head through integrated casting techniques [2] [4].

Structurally, cylinder heads are categorized into three types: integral, split (modular), and individual. These classifications accommodate varying engine configurations and cylinder arrangements. Due to exposure to high-temperature combustion gases and mechanical loading, the cylinder head must exhibit robust resistance to both thermal and mechanical stress. Common failure modes include warping of the sealing surface and cracking at the valve seats. Notably, aluminum alloy heads, while offering weight advantages, are more susceptible to damage due to their lower hardness compared to cast iron alternatives. Proper maintenance procedures-such as adhering to specified bolt tightening sequences, avoiding abrupt thermal cycling, and periodic removal of coolant deposits-are essential to prolong service life.

Functional Design Considerations
1. Operational Conditions and Performance Requirements
The cylinder head is subjected to significant gas pressure and mechanical loads generated by the tightening of cylinder head fasteners. Additionally, it experiences intense thermal stress due to direct exposure to combustion temperatures. To maintain effective cylinder sealing, the component must remain free from deformation and structural failure. Therefore, adequate mechanical strength and rigidity are imperative. Uniform temperature distribution across the component is also crucial to prevent localized overheating and thermal fatigue cracking between intake and exhaust valve seats. Effective cooling systems are therefore essential.

2. Material Selection
Cylinder heads are typically fabricated from high-grade gray cast iron or alloyed cast iron, particularly in heavy-duty diesel applications where thermal and mechanical durability are paramount. In contrast, automotive gasoline engines commonly employ aluminum alloy cylinder heads, valued for their reduced mass and improved heat transfer characteristics.

3. Structural Configuration
As a complex box-section casting, the cylinder head incorporates machined features including intake and exhaust valve seat bores, valve guide holes, spark plug mounting ports (for gasoline engines), and fuel injector apertures (in diesel variants). Internally, it contains water jackets, intake and exhaust ducts, and either complete or partial combustion chambers. When overhead camshaft arrangements are employed, the cylinder head includes precision-machined camshaft bearing journals and associated lubrication galleries.

In terms of design classification, water-cooled engines utilize one of three cylinder head configurations: integral (monoblock) type, where all cylinders share a single head; split type, where two or three cylinders share a common head; and individual type, where each cylinder has a dedicated head. Air-cooled engines exclusively employ the individual cylinder head configuration to facilitate optimal heat dissipation.