Cabeça de cilindro FAW J6P: O guia definitivo de 4 núcleos para suas peças que podem ser reparadas

Welcome to this definitive technical deconstruction of the Cabeça de cilindro FAW J6P, the core serviceable casting for the engine powering the FAW Jiefang CA3250P66K2L1T1E 6×4 caminhão basculante a diesel.

This is not the *complete* assembly, mas o “bare head” em si (P/N 1003011A59D / 1003011-59D)—the single most complex casting in the powertrain.

O “lógica” do Cabeça de cilindro FAW J6P é ser o “sala de controle” of combustion. It must perform three critical tasks: withstand immense heat and pressure, gerenciar todo o motor “respirando” (fluxo de ar), and serve as a complex heat exchanger.

O “design logic” deste específico Cabeça de cilindro FAW J6P is centered on durability and, o mais importante, “serviceability.” This component group is what an engine machine shop would use to rebuild a head. It includes the replaceable “wear” items that are press-fit into the main casting, such as the valve guides and valve seats. A crack or warp in the main Cabeça de cilindro FAW J6P casting is one of the most severe engine failures, as it allows coolant, óleo, and combustion gases to mix, levando a uma falha catastrófica. Understanding its serviceable components is therefore essential for any long-term fleet maintenance.

Este guia especializado é um recurso essencial para reconstrutores de motores, machine shop technicians, and parts managers. We will deconstruct this entire 10-component type group into its four primary “lógica” sistemas: o “Main Casting & Freio” Lógica (the bare head itself), o “Valvetrain Interface” Lógica (the replaceable guides and seats), o crítico “Injector Sealing” Lógica (copper sleeves and O-rings), e o “Foundry Sealing” Lógica (the various plugs that make the Cabeça de cilindro FAW J6P casting fluid-tight).

Essencial 1: O “Main Casting & Freio” Lógica (Componente 1)

This component is the structural foundation for this entire group. All other parts are installed *into* this one.

1. Componente: ‘Cylinder head’ (1003011A59D / 1003011-59D)
Este é o principal Cabeça de cilindro FAW J6P fundição. The parts list shows two distinct part numbers, e o “lógica” is explicitly stated: um (1003011A59D) is for trucks “com freio motor,” and the other (1003011-59D) is for trucks “without engine brake.” This is a critical distinction. O “Engine Brake Logic” of the ‘A59D’ part means the casting has complex, additional oil galleries drilled deep into it. These passages are designed to route high-pressure engine oil to the engine brake (ou “Jake Freio”) sistema, which is housed in the rocker assembly above. O “non-brake” Cabeça de cilindro FAW J6P lacks these passages and is a simpler, and therefore different, fundição.

Both versions share the same “foundry logic,” being cast from a high-strength, temperature-stable iron alloy. Deles “thermal logic” is the intricate “jaqueta de água”—a complex, web-like internal passage that allows coolant to circulate aggressively around the two hottest areas: the exhaust valve seats and the fuel injector bores. This prevents the Cabeça de cilindro FAW J6P from warping or cracking under extreme load. O “lógica de fluxo de ar” disso Cabeça de cilindro FAW J6P is in its precision-cast intake and exhaust ports, which are shaped to optimize air “redemoinho” for a clean, powerful combustion.

Essencial 2: O “Valvetrain Interface” Lógica (Componentes 8, 9, 10)

This group represents the core “serviceability logic” do Cabeça de cilindro FAW J6P. Estes são os “wear” surfaces for the valvetrain, and they are designed to be replaceable.

1. Componente: ‘Valve guide’ (1003014-29D)
A lista pede 24 guides (Comp. 8), one for each of the 24 válvulas (12 ingestão, 12 escape). O “lógica” of a ‘Valve guide’ is to be a replaceable, low-friction sleeve. O Cabeça de cilindro FAW J6P casting is iron, but running a hardened valve stem directly in the iron would cause rapid wear. Em vez de, these guides (often made of a bronze alloy or a different iron composite) são “press-fit” into the head. Deles “precision logic” is to hold the valve in perfect alignment, allowing it to seal correctly against the seat. When these wear out, they can be “pressed” out and replaced, restoring the Cabeça de cilindro FAW J6P para “como novo” doença.

2. Componentes: ‘Intake valve seat’ (1003012-36D) & ‘Exhaust valve seat’ (1003013-36D)
Este é o “Combustion Sealing Logic.” The valves must seal against a perfectly round, incredibly hard surface. The cast iron of the Cabeça de cilindro FAW J6P is too soft for this. O “lógica” here is to press-fit two different types of ‘Valve seats’ (Comp. 9 & 10) into the head. The ‘Exhaust valve seat’ (Comp. 9) is made of a very hard, high-temperature steel alloy (like Stellite) to withstand superheated exhaust gases. The ‘Intake valve seat’ (Comp. 10) is also hardened steel, but with different properties as it is cooled by the intake air. Deles “service logic” is that they are the “sacrificial” papel; they can be re-ground (a “valve job”) multiple times, and if they wear too much, they can be machined out and replaced, which saves the entire Cabeça de cilindro FAW J6P casting from being scrapped.

Essencial 3: O “Injector Sealing” Lógica (Componentes 3 & 4)

Este grupo “lógica” is to create a perfect, “dual-seal” for the high-pressure fuel injectors. This is a critical task in a modern diesel, sealing both combustion *in* and fluids *out*.

1. Componente: ‘Injector copper sleeve’ (1003016-29D)
A lista pede 6 mangas (Comp. 4), one for each injector. Este componente “lógica” é “combustion sealing” e “heat transfer.” This sleeve is pressed into the bottom of the injector bore in the Cabeça de cilindro FAW J6P. O “copper logic” is that copper is a soft, malleable metal. It creates a perfect “crush” seal against the injector tip, preventing the 2500+ PSI of combustion gas from escaping. It also acts as a vital “heat sink,” pulling heat *away* from the delicate injector tip and transferring it into the coolant in the Cabeça de cilindro FAW J6P‘s water jacket. This dual-seal system is a hallmark of a robust, modern diesel engine design.

2. Componente: ‘O-ring’ (1003018-29D)
A lista pede 6 O-rings (Comp. 3). Este é o “fluid sealing logic.” These O-rings sit in a groove higher up on the injector or injector sleeve. Deles “lógica” is to prevent fluids (fuel from the return galley or oil from the valvetrain) from leaking *out* of the engine, and to prevent coolant from leaking *into* the injector bore. A failure of the copper sleeve (Comp. 4) leads to combustion in the coolant; a failure of the O-ring (Comp. 3) leads to fuel in the oil or an external leak. Both are critical seals for the Cabeça de cilindro FAW J6P.

Essencial 4: O “Foundry Sealing” Lógica (Componentes 2, 5, 6, 7)

Este grupo final “lógica” é simples: to plug the holes left by the manufacturing process. A complex casting like a Cabeça de cilindro FAW J6P cannot be made without numerous access holes.

Componentes: ‘Bowl plug’ (Q72240, Q72232, Q72222, Q7226)
These components are commonly known as “freeze plugs” ou “core plugs.” Deles “lógica” is to seal the large, circular holes in the Cabeça de cilindro FAW J6P fundição. These holes are an essential part of the “sand casting” process, as they are used to remove the internal sand “essencial” that forms the complex shape of the water jacket. After casting, these plugs are hammered or pressed in to create a permanent, watertight seal for the cooling system.

The parts list shows a high quantity (1 + 1 + 6 + 16 = 24 total plugs) of various sizes, which demonstrates the extreme complexity of the internal coolant passages. Note that, just like the head casting itself, there is a specific ‘Bowl plug’ (Comp. 5, Q72232) designated for the “engine brake” version. Esse “brake logic” implies it is used to seal a specific access hole that was drilled for the engine brake’s oil gallery, a hole that does not exist on the non-brake version of the Cabeça de cilindro FAW J6P.

FAW J6P Cylinder Head Parts List & Especificações

A tabela a seguir fornece o completo, detalhamento de todos 10 serviceable component types identified in this Cabeça de cilindro FAW J6P grupo para o FAW Jiefang CA3250P66K2L1T1E 6×4 caminhão despejando.

Especificações principais

The specifications for the bare Cabeça de cilindro FAW J6P are defined by its function as the serviceable core for airflow and combustion.