3991495 5333484 12539204 بكرة شداد الحزام المضلع للمحرك على شكل حرف V لـ QSM11 ISM11 ISMe

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 3991495 5333484 12539204 is engineered for maximum durability and precise fitment in QSM11 ISM11 M11 LT10 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: 3991495 5333484 12539204

Condition: Brand New / High-Quality OEM / Aftermarket
Warranty: 6 Months / 1 Year
Engine Model: QSM11 ISM11 M11 LT10

Application:

QSM11: Fully electronically controlled diesel engine for off-highway use (e.g., "QSM11-C"), with a power output of 290–420 hp, suitable for construction machinery (rotary drilling rigs, mining trucks, crawler cranes, reach stackers, port machinery, railcars, etc.). Most meet China III/Euro III Tier 3 or earlier Tier 2 standards; some early versions feature a hybrid mechanical/electronic control system.

ISM11: Fully electronically controlled diesel engine for heavy-duty on-highway trucks (e.g., "ISM11E4"), with a power output of 308–440 hp, suitable for heavy-duty trucks, tractors, and construction vehicles. Mainstream meet China IV/Euro IV (E4) or China III/Euro III (E3) standards, emphasizing low-speed high torque and fleet operational economy. M11: An early road/industrial machinery/electronically controlled hybrid engine (not fully electronic), with a power output of 250–435 horsepower. It was widely used in heavy trucks, buses, ships, generator sets, and some construction machinery in the 1990s–2000s. Most met China II/Euro II or earlier standards. Production has largely ceased, replaced by the ISM/QT series.

LT10: The L10 was used in heavy trucks, buses, power generation, and ships (1980s–2000s), but is not a current mainstream product. If referring to the "LT" series (such as LTA10), it is a turbocharged intercooled version with similar applications to the L10.

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