3635034 3691279 3639118 Engine Drive Belt Idler Tensioner Pulley For G50 KTA50 QSK50 QSK38 KTA38

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 3635034 3691279 3639118 is engineered for maximum durability and precise fitment in KTA50 QSK50 QSK38 KTA38 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: 3635034 3691279 3639118

Condition: Brand New / High-Quality OEM / Aftermarket
Warranty: 6 Months / 1 Year
Engine Model: KTA50 QSK50 QSK38 KTA38

Application:

KTA38: 38-liter displacement, inline 6-cylinder, turbocharged, intercooled, using a PT fuel system. Primarily used in construction machinery (such as large loaders, excavators, and bulldozers), medium-sized marine propulsion, and 1000–1200 kW generator sets.

QSK38: A "high-strength" version of the KTA38 (QSK = Quadrant Super K), with a reinforced cylinder block, crankshaft, and cooling system. Designed for continuous high-load conditions, such as ocean-going marine main engines, mining trucks, and large stationary power plants (1200–1500 kW).

KTA50: 50-liter displacement, inline 6-cylinder, commonly found in heavy mining machinery, large construction vehicles (such as off-highway mining trucks), marine auxiliary power, and 1100–1300 kW generator sets (such as KTA50-G3/G8). Mostly meets China III or lower emission standards. No longer used in new on-road vehicles in China, mostly for export or special off-road machinery. QSK50: An enhanced version of KTA50, featuring higher durability and power density (up to 1480 kW standby power), used for ultra-large ship propulsion, offshore platforms, backup power for large data centers, and fixed equipment in mining (1300–1800 kW).

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100% Quality Guaranteed: All parts undergo rigorous testing to ensure perfect compatibility and premium performance.
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