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The smooth operation of engine accessories is fundamental to truck performance and reliability. As a critical consumable part among genuine Sinotruk howo parts, the Accessory Belt (Serpentine Belt), identified by OEM numbers 3972375 /8PK2135, is responsible for driving multiple engine components. This multi-ribbed belt transfers power from the engine crankshaft to vital accessories. The genuine 3972375 /8PK2135 belt ensures efficient operation of the alternator, water pump, power steering pump, and air compressor. It is engineered for durability, flexibility, and reliable power transmission under demanding conditions.
Accessory Belt
Ремень привода агрегатов
Correa de accesorios
The Accessory Belt, part numbers 3972375 /8PK2135, is a single, multi-ribbed serpentine belt. It snakes around multiple pulleys on the engine’s front. Its primary function is to drive all belt-driven engine accessories from one power source. The crankshaft pulley provides the rotational force.
The belt 3972375 /8PK2135 turns the alternator to charge the battery. It drives the water pump to circulate coolant. It powers the power steering pump for steering assist. It also often runs the air compressor for the braking system.
This consolidated design is efficient and reliable. A single belt, the genuine 3972375 /8PK2135, replaces multiple V-belts. It requires proper tension to function correctly. A failed belt leads to immediate loss of multiple vehicle systems.
Multi-Rib Design for Maximum Grip
The 8PK2135 rib profile provides a large contact area with pulleys, preventing slippage and ensuring efficient power transfer to all driven components.
Heat and Oil Resistance
Made from EPDM or similar advanced rubber compounds, the belt resists cracking from under-hood heat and degradation from minor oil exposure.
Quiet and Vibration-Free Operation
Precision manufacturing ensures even tension distribution and proper tracking, minimizing noise and vibration for a smoother engine compartment.
Extended Service Life
The genuine is built to last, with reinforced tensile cords that resist stretching and fatigue over thousands of miles.
| Parameter / Feature | Specification / Description |
|---|---|
| OEM Part Number | 3972375 /8PK2135 |
| Component Name | Accessory Belt (Serpentine Belt, Fan Belt) |
| Brand & Application | SINOTRUK Howo, for driving alternator, water pump, power steering, air compressor. |
| Belt Type | Multi-Rib (Poly-V) Serpentine Belt. |
| Belt Profile | 8PK (8 ribs, K-profile dimensions). |
| Effective Length | 2135 mm (as denoted by 8PK2135). |
| Material | High-grade EPDM rubber with polyester tensile cords. |
| Temperature Range | Designed to perform in extreme under-hood temperatures. |
| Product Condition | New, 100% Genuine OEM Part. |
A worn accessory belt, part 3972375 /8PK2135, shows clear visual and audible warnings. Squealing or chirping noises at startup or during steering is common. This indicates glazing or loss of grip on the pulleys.
Visible cracks on the ribbed side of the belt are a major red flag. These are often called “dry rot” cracks. Fraying along the edges or missing pieces of ribs indicate advanced wear. A shiny, glazed appearance on the ribs suggests slippage.
Functional symptoms include dimming headlights or a battery warning light. This points to alternator undercharging. Overheating may occur if the water pump is not spinning correctly. Loss of power steering assist is another serious sign.
Regular inspection of the belt is crucial. Catching wear early prevents a sudden breakdown. A snapped belt disables multiple systems simultaneously. This can leave the truck stranded and cause engine damage from overheating.
Replacing the serpentine belt is a standard maintenance task. First, locate the belt routing diagram, often on the radiator shroud. This shows the correct path for the belt around all pulleys.
Most SINOTRUK Howo models use an automatic tensioner. Use a breaker bar or socket on the tensioner pulley’s square bolt. Rotate the tensioner to release pressure and slip the old belt off. Note the exact routing before removal.
Route the new genuine belt according to the diagram. Ensure it sits correctly in all pulley grooves. Release the tensioner slowly to apply tension. The automatic tensioner will set the correct preload.
For manual tensioners, adjust to the specified deflection. Start the engine and let it run for a few minutes. Recheck tension and visually confirm the belt is tracking straight. Proper installation of the 3972375 /8PK2135 ensures longevity.
The accessory belt is a wear item with a finite service life. Proactive replacement is more economical than a roadside failure. Check the belt 3972375 /8PK2135 every time you check the engine oil.
Look for the warning signs mentioned earlier. Also, check the condition of all pulleys and the tensioner. A misaligned or seized pulley will destroy a new belt quickly. Address any oil leaks from the engine that could contaminate the belt.
Following the manufacturer’s recommended replacement interval is essential. Even if it looks okay, the internal cords may be fatigued. Replacing the belt as a preventative measure ensures uninterrupted vehicle operation.
The genuine belt is manufactured to exact length and profile specifications. It ensures perfect fitment on all pulleys without being too tight or too loose. Incorrect length causes improper tension and rapid failure.
The rubber compound is formulated for OEM durability and flexibility. Non-genuine belts may use inferior materials that crack prematurely. The rib profile must match the pulley grooves precisely to prevent slippage and noise.
Using the correct part, 3972375 /8PK2135, guarantees the belt will work with the vehicle’s specific automatic tensioner system. It is a simple component where quality directly translates to reliability and reduced downtime.
The Accessory Belt, OEM numbers 3972375 /8PK2135, is the essential link that powers your truck’s critical support systems. Its failure has immediate and severe consequences for vehicle operation and safety.
Investing in the genuine 3972375 /8PK2135 belt guarantees the correct fit, material quality, and performance needed for heavy-duty service. Maintain the reliability of your SINOTRUK Howo by adhering to a proactive inspection and replacement schedule with authentic OEM parts.
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