2871293 3691283 4299052 3684428 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 2871293 3691283 4299052 3684428 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: 2871293 3691283 4299052 3684428

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

Application:

QSX15: Off-highway (Tier 2/3) fully electronically controlled heavy-duty engine, mainly used in construction machinery (such as rotary drilling rigs, 70-ton excavators, mining trucks, milling machines, bulldozers), marine auxiliary power, large generator sets, and special vehicles. Power range: 360–675 hp. Discontinued and replaced by the X15.

ISX15: On-highway (e.g., EPA 2010 / Euro VI) electronically controlled heavy-duty engine, designed specifically for compliant heavy trucks such as long-haul tractors, heavy-duty dump trucks, and concrete mixer trucks. Power range: 400–600 hp. A previous generation mainstay on-highway engine, gradually being replaced by the X15.

X15: The current mainline highway engine (replacing the ISX15), supporting a high-efficiency SCR + EGR + new combustion system. It is used in the latest heavy-duty trucks, special-purpose highway vehicles, and some compliant engineering equipment. Power output is 400–605 horsepower, meeting the latest emission standards (such as EPA 2017/2021). Some derivative models (such as the X15 Efficiency Series) are also used in off-highway special applications.

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