نظام العادم فاو: دليل حاسم لها 34 مكونات ما بعد العلاج

مرحبًا بك في هذا الدليل الفني المهم حول نظام العادم فاو لفاو جيفانغ CA4251P66K24T1A3E5 6×4 جرار نصف مقطورة ديزل. This is not just a muffler; إنه كامل, multi-stage emissions after-treatment system, essential for modern diesel performance and environmental compliance.

ال نظام العادم فاو is a highly engineered assembly responsible for two primary tasks: تقليل الضوضاء (muffling) and emissions neutralization. This guide focuses on the ‘Selective Catalytic Reduction (SCR) After-treatment Assembly’ (1208010-90R-C00), وهو “logic box” that uses urea (مدافع) to convert harmful NOx into nitrogen and water.

This in-depth guide is a vital resource for professional technicians, مديري الأسطول, ومتخصصين في قطع الغيار. سنقوم بتفكيك الكل نظام العادم فاو فيه 34 مكونات صالحة للخدمة, including the main SCR unit, the inlet/outlet piping, the critical heat shields, and all the specialized mounting brackets and hardware.

المكون الأساسي: The SCR After-Treatment Assembly (1208010-90R-C00)

The heart of the modern نظام العادم فاو is the ‘Selective Catalytic Reduction After-treatment Assembly’ (1208010-90R-C00). هذا هو الكبير, chassis-mounted “صندوق” that all other components in this list support. It is not a simple muffler; it is an active chemical reactor.

This unit contains a series of catalysts. أولاً, the hot exhaust gas passes through a **Diesel Oxidation Catalyst (وثيقة)**, which breaks down carbon monoxide (CO) and unburnt hydrocarbons (HC). التالي, it passes through a **Diesel Particulate Filter (ج.م.ب.ف)**, which is a ceramic “soot trap” that physically captures the black smoke particles.

After the DPF, the urea (مدافع) is injected into the gas stream. This mixture then enters the **Selective Catalytic Reduction (SCR)** catalyst. هنا, the ammonia in the urea reacts with the harmful Nitrogen Oxides (أكاسيد النيتروجين), converting them into harmless nitrogen (N2) والماء (ماء). هذا المجمع, multi-stage process is the “منطق” التابع نظام العادم فاو. A failure of this component will trigger a “فحص المحرك” light and will cause the truck to fail emissions testing.

Inlet Piping and Vibration Damping

ال نظام العادم فاو is mounted to the chassis, but the engine vibrates and twists. A rigid pipe connecting the two would snap in minutes. The ‘Telescopic bellows assembly’ (1203040-2000) هو الحل. This is a flexible, corrugated steel joint that absorbs the engine’s movement and thermal expansion, protecting the rest of the نظام العادم فاو from stress.

This bellows connects to the ‘Inlet pipe assembly-select catalytic reduction’ (1203815-92دبليو), وهو الرئيسي, pre-bent pipe that feeds the hot gas from the turbocharger into the SCR assembly.

This inlet pipe is heavy and must be supported, which is the job of the ‘Bracket assembly-inlet pipe’ (1203045-92دبليو). هذه القوس, along with its ‘Combination bolts’ (CQ1461045) و "المكسرات السداسية."’ (CQ34010), holds the pipe securely to the engine or chassis, preventing it from cracking under its own weight. This entire inlet path is a critical part of the نظام العادم فاو.

The Critical Heat Shield System

The DPF “regeneration” دورة, which burns off trapped soot, can raise the temperature of the نظام العادم فاو to over 600°C (1100° f). This intense radiant heat is a major fire hazard. This parts list includes a comprehensive heat shield system to protect the truck.

This includes the ‘Heat shield assembly’ (1204045-92W and 1204025-92W), which are large, stamped-metal shields. More specifically, the SCR box is wrapped in its own set of shields:

• ‘Upper heat shield-after-treatment’ (1204038-92دبليو)
• ‘Side heat shield-after-treatment’ (1204046-92دبليو)
• ‘Front heat shield-after-treatment’ (1204028-76دبليو)

These shields create a “الحاجز الحراري” of air, reflecting the heat and protecting the chassis, fuel lines, تسخير الأسلاك, and anything else nearby. A missing heat shield on the نظام العادم فاو is a major safety violation and will lead to melted components. These shields are secured by a ‘Bracket assembly’ (1203055-92دبليو) and specialized ‘Hex flange bolts’ (س1841455, Q1841450, Q1841475).

Mounting and Support Hardware

The heavy ‘SCR After-treatment Assembly’ (1208010-90R-C00) is held in place by a robust cradle system. This includes the ‘Bracket assembly-after-treatment’ (1203050-92دبليو) and ‘Bracket assembly-after-treatment’ (1203055-92دبليو).

These brackets are secured to the chassis, and the SCR box is then held by the ‘Clamping band assembly-after-treatment’ (1203090-73دبليو). These bands wrap around the unit and are tensioned with bolts. To prevent metal-on-metal contact, a ‘Gasket plate assembly’ (1203025A263) is used as a vibration-damping insulator.

The rest of the نظام العادم فاو, such as the tailpipe, is hung using the ‘Clamp-muffler hanger’ (1203041-274). The entire assembly is fastened with a large array of ‘Hex flange lock nuts’ (CQ32610, Q932614), "المكسرات السداسية."’ (CQ34010, CQ34008, CQ34012), "مسامير سداسية الرأس."’ (CQ1501030, CQ1501025), و "جوانات الربيع".’ (س40310, س40308). This hardware is all high-temperature and vibration-resistant, essential for the reliability of the نظام العادم فاو.

FAW Exhaust System Parts List

الجدول التالي يوفر كامل, تفصيل مفصل للجميع 34 components identified in the ‘Exhaust System’ رسم تخطيطي للجرار FAW CA4251P66K24T1A3E5. هذا نظام العادم فاو is a complex after-treatment assembly.

المواصفات الفنية وسياق التجميع

المواصفات ل نظام العادم فاو يتم تعريفها من خلال وظيفتها على أنها كاملة, chassis-mounted emissions after-treatment system. كامل نظام العادم فاو is critical for emissions compliance and noise reduction.