4059202 3681240 Engine V-ribbed Belt Tensioner Pulley For QSX15 ISX15 X15

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 4059202 3681240 is engineered for maximum durability and precise fitment in QSX15 ISX15 X15 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: 4059202 3681240

Condition: Brand New / High-Quality OEM / Aftermarket
Warranty: 6 Months / 1 Year
Engine Model: QSX15 ISX15 X15

Application:

QSX15: A 15-liter large-displacement, mechanically/electronically controlled high-pressure common rail engine (early fully electronically controlled), primarily used in off-highway construction machinery (such as 70-ton excavators, rotary drilling rigs, mining dump trucks, milling machines, air compressors, and large bulldozers). It meets Tier 2/Tier 3 off-road emission standards and is discontinued, replaced by the ISX15/X15.

ISX15: A 15-liter fully electronically controlled high-pressure common rail engine, designed for highway heavy-duty truck tractors, heavy-duty dump trucks, and some construction machinery. It meets the US EPA 2007–2010 emission standards (EGR+DPF) and was the main engine for high-end heavy-duty trucks in North America and China around 2010. It was also used in some port machinery and generator sets.

X15: An upgraded version of the ISX15 (after 2017), featuring iAOS intelligent valve control and optimized after-treatment system. Designed specifically for heavy-duty highway trucks (tractors, dump trucks, concrete mixers, etc.), it meets EPA 2010–2024 and EPA 2024 / Euro VI emission standards. It is not intended for traditional construction machinery (such as excavators and rotary drilling rigs), emphasizing fuel economy and total cost of ownership (TCO).

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