5256546 Cinturón de accionamiento del motor Pulley de tensión para 6BT 5.9 ISB6.7 QSB6.7 6D107

A belt tensioner is a device that applies a predetermined amount of tension to the engine's accessory drive belt (serpentine belt). Its primary function is to maintain constant, optimal tension on the belt as it wears and stretches over time. This prevents the belt from slipping, squealing, or throwing off, ensuring that critical components like the alternator, water pump, and A/C compressor operate reliably. This belt tensioner 5256546  is engineered for maximum durability and precise fitment in 6BT 5.9 ISB6.7 QSB6.7 6D107 engines. Manufactured to meet or exceed OEM standards, it ensures optimal engine performance and a long service life under heavy-duty conditions.

Whether for full engine rebuilds or quick replacements, DDP Engine provides you with the most reliable parts at unbeatable wholesale prices.

Parameter Details
Product Name: Belt Tensioner
Part Number: 5256546

Condition: Brand New / High-Quality OEM / Aftermarket
Warranty: 6 Months / 1 Year
Engine Model: 6BT 5.9 ISB6.7 QSB6.7 6D107

Application:

6BT 5.9 (Early mechanical B-series): Used in 1980s–2000s 2500/3500 pickup trucks (North America), engineering vehicles (such as excavators and rotary drilling rigs), marine engines, and some domestically produced heavy-duty trucks/special-purpose vehicles. Non-electronically controlled, high torque, cast iron body, emphasizing durability but low emissions (China 0–China III).

ISB6.7 (Electrically controlled upgraded version of B-series, 6.7L): Used since 2007 in medium and heavy-duty trucks, city buses/municipal vehicles, and overseas Ram 2500–5500 heavy-duty trucks (2007–2019 models). Meets China IV–China VI standards (aftertreatment includes SCR/EGR), power 185–300 horsepower, a mainstay of highway transportation. QSB6.7 (C-series construction machinery dedicated, 6.7L): Designed specifically for construction machinery (such as PC240-8 excavators, loaders, road rollers), off-highway vehicles, power 130–260 hp (99–194 kW), high-pressure common rail, fast response, adaptable to varying loads, often labeled "QSB6.7-Cxxx" (e.g., C170, C260).

6D107 (6-cylinder, approximately 7.8L, non-QSB/ISB platform): Primarily used in medium-sized excavators (such as PC200–270-8), marine auxiliary power, or stationary generators; not mainstream on-highway vehicles.

Why Choose DDP Engine:
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