Tanque de Expansão FAW, Tubulação, Colchetes: Uma análise especializada de 21 Componentes -chave

Bem-vindo a esta análise técnica especializada do Tanque de Expansão FAW, Tubulação, Colchetes sistema para o FAW Jiefang CA4251P66K24T1A3E5 6×4 trator semirreboque diesel. This assembly is the critical “overflow” e “deaeration” system for the engine’s high-pressure cooling circuit.

O Tanque de Expansão FAW, Tubulação, Colchetes assembly is a multi-part system that performs three vital functions: it provides a reservoir for coolant to expand into as it heats up, it traps and purges all air bubbles from the system (deaeration), and it serves as the high point for filling and checking the coolant level.

Este guia detalhado é um recurso essencial para técnicos profissionais, gestores de frota, e especialistas em peças. Vamos desconstruir todo Tanque de Expansão FAW, Tubulação, Colchetes sistema em seu 21 componentes reparáveis, including the ‘Expansion Tank Assembly’ (1311020-76A), its ‘Pressure Cap’ (1304010-50A), all connecting hoses, and the critical vibration-damping brackets.

Componente principal: The Expansion Tank (1311020-76A)

O núcleo do Tanque de Expansão FAW, Tubulação, Colchetes system is the ‘Expansion Tank Assembly’ (1311020-76A). This is the high-point reservoir of the cooling system. It is a robust, translucent polymer (plástico) tanque, allowing a technician to visually inspect the coolant level without opening the system.

This tank’s primary function is to manage thermal expansion. As the engine’s coolant heats up from 20°C to 95°C, it can expand in volume by 3-5%. O Tanque de Expansão FAW, Tubulação, Colchetes system provides the “air head” or empty space for this expanded coolant to move into. Sem isso, the expanding fluid would create immense pressure and rupture the radiator or hoses.

Segundo, this tank is the “deaeration” centro. It is designed to be the highest point in the cooling circuit. Small “deaeration” lines from the radiator (1311061A377) and engine head (1311068-61B) feed into this tank. Any air bubbles or steam pockets from the engine are “bled” into this tank, where they are trapped. This ensures the engine block and water pump are always filled with 100% liquid coolant, prevenindo “pontos quentes” that can crack a cylinder head. This deaeration logic is a key function of the Tanque de Expansão FAW, Tubulação, Colchetes sistema.

The Pressure Cap Assembly (1304010-50A)

The ‘Pressure Cap Assembly’ (1304010-50A) is the most critical “lógica” component in the entire Tanque de Expansão FAW, Tubulação, Colchetes sistema. It is not just a lid; é um sofisticado, com mola, two-way valve.

**1. Pressure Valve (Raises Boiling Point):** The main function of this cap is to pressurize the entire cooling system (Por exemplo, para 1.1 bar / 16 PSI). For every 1 PSI of pressure, the boiling point of water is raised by approximately 1.7°C (3° f). This 16-PSI cap raises the coolant’s boiling point from 100°C (212° f) to over 126°C (257° f). This is *essential* for a heavy-duty diesel engine, as it prevents the coolant from boiling (“cavitação”) around the hot cylinder liners, which would lead to immediate, catastrophic overheating. The large spring inside the cap holds this pressure.

**2. Vacuum Valve (Prevents Hose Collapse):** When the engine is turned off, the coolant (now at 95°C) begins to cool. As it cools, it contracts, creating a powerful *vacuum* inside the cooling system. This vacuum is strong enough to collapse the large, soft radiator hoses (like 1303021-74A). To prevent this, a small, reverter, “vazio” valve in the center of the cap is pulled *open* by this vacuum, allowing air to be drawn *into* the Tanque de Expansão FAW, Tubulação, Colchetes assembly to equalize the pressure.

A faulty pressure cap is a very common and misdiagnosed cause of overheating. If its spring is weak, the system will not pressurize, and the engine will boil over at normal operating temperature. O Tanque de Expansão FAW, Tubulação, Colchetes system is entirely dependent on this one part.

O “Tubulação”: Hoses and Steel Tubes

O “Tubulação” componentes do Tanque de Expansão FAW, Tubulação, Colchetes are a network of hoses and pipes for returning and deaerating coolant.

**Desaeração (Sangramento de ar) Linhas:** These are the small hoses that “sangrar” air from the system. A ‘mangueira de desaeração’ (1311068-61B) and ‘Rear deaeration hose’ (1311069-61B) run from the high points of the engine (like the thermostat housing) to the top of the ‘Expansion Tank Assembly’. The ‘Radiator front deaeration hose’ (1311061A377) runs from the top of the radiator to the tank. These pipes ensure all trapped air is purged.

**Return Water Circuit:** This is the circuit that returns coolant from the vehicle’s “heater core” (which provides heat to the cab) and the fuel heater. This circuit is comprised of the ‘Return water hose’ (1311033-61B), ‘Mangueira de água de retorno frontal’ (1311038-61C), ‘Connecting pipe assembly’ (1311025-61C), and the ‘Steel return water pipe assembly’ (1311065-91C). This combination of flexible rubber hoses (to absorb engine vibration) and rigid steel pipes (for long, protected runs) é uma parte fundamental do Tanque de Expansão FAW, Tubulação, Colchetes durabilidade do sistema.

This entire network of “pipework” is held together with numerous ‘Worm Drive Hose Clamps’ (CQ67622B, CQ67640B) and ‘Plastic zip ties’ (T67420376) to ensure a leak-free, vibration-resistant setup for the Tanque de Expansão FAW, Tubulação, Colchetes.

O “Suporte” Sistema: Isolating the Tank and Pipes

O “Suporte” componentes do Tanque de Expansão FAW, Tubulação, Colchetes are essential for protecting the system from vibration. The ‘Expansion Tank Bracket Assembly’ (1311040-61C) é o principal “prateleira” that bolts to the cab or chassis, holding the heavy, fluid-filled ‘Expansion Tank Assembly’.

The extensive piping is also rigidly supported. The ‘Front support bracket for return steel pipe’ (1311070-91C), ‘Rear support bracket for return steel pipe’ (1311075-91C), and ‘Deaeration pipe support bracket assembly’ (1311080-91C) are all used to clamp the long steel and rubber pipes.

This prevents the pipes from chaffing against the engine or frame, which would quickly wear a hole in them. O ‘suporte’ (1311077-61B) and ‘Double-pipe clamp assembly’ (1311060-61B) are used to group and secure multiple hoses, mantendo o Tanque de Expansão FAW, Tubulação, Colchetes system tidy and safe from moving parts.

Tanque de Expansão FAW, Tubulação, Brackets Parts List

A tabela a seguir fornece o completo, detalhamento de todos 21 components identified in the ‘Expansion Tank, Tubulação, Colchetes’ diagrama para o trator FAW CA4251P66K24T1A3E5. Esse Tanque de Expansão FAW, Tubulação, Colchetes system is key to engine thermal management.

Especificações Técnicas e Contexto de Montagem

As especificações para o Tanque de Expansão FAW, Tubulação, Colchetes system are defined by its function as the cooling system’s reservoir, pressurization, and deaeration hub. O Tanque de Expansão FAW, Tubulação, Colchetes assembly is key to engine thermal management.