4991240 3978019 4983816 3971876 5256103 3935015 ZK6852HG-1 KLQ6109 Engine V-ribbed Belt Tensioner Pulley For 6ISBe 6CT ISLe ISF 3.8 ISBe ISDe

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 4991240 3978019 4983816 3971876 5256103 3935015 ZK6852HG-1 KLQ6109 is engineered for maximum durability and precise fitment in 6ISBe 6CT ISLe ISF 3.8 ISBe ISDe. 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: 4991240 3978019 4983816 3971876 5256103 3935015 ZK6852HG-1 KLQ6109

Condition: Brand New / High-Quality OEM / Aftermarket
Warranty: 6 Months / 1 Year
Engine Model: 6ISBe 6CT ISLe ISF 3.8 ISBe ISDe

Application:

6ISBe (e.g., ISBE 5.9L/6.7L inline six-cylinder): Primarily used in medium and heavy-duty trucks (e.g., 4x2/6x4 tractors, dump trucks), city buses, light construction machinery, and generator sets. Commonly used in China III to China IV emission standards, with power outputs of approximately 185–285 horsepower.

6CT (5.9L mechanical inline six-cylinder, non-electronic): A classic "B/C series" predecessor, primarily used in heavy-duty trucks, construction machinery, ships, and stationary power units from the 1980s to the 2000s. Now largely retired or used in the second-hand/specialty market.

ISLe (e.g., ISLe 8.9L/9L inline six-cylinder): Designed specifically for heavy-duty trucks (e.g., tractors, dump trucks), large buses, and off-highway machinery (mining trucks, port equipment). Power outputs of 250–350 horsepower, meeting China III to China V emission standards.

ISF 3.8 (3.8L inline four-cylinder): Covers light trucks, medium-sized buses, refrigerated trucks, pickups, and small construction/agricultural machinery. Euro V/Euro VI versions have 141–190 horsepower and are light-duty electronically controlled high-pressure common rail engines.

ISDe (such as ISDe 4.5L/6.7L inline four/six-cylinder): Primarily used in light and medium-sized trucks (3–5 ton logistics vehicles), municipal vehicles, school buses, generators, and marine auxiliary engines. Power output is 160–250 horsepower, emphasizing fuel economy and Euro IV/Euro V compliance.

Why Choose DDP Engine:
100% Quality Guaranteed: All parts undergo rigorous testing to ensure perfect compatibility and premium performance.
Fast Worldwide Shipping: Large inventory in stock. Orders are typically processed within 3-7 working days with reliable global express and Transportation.
Professional Technical Support: Unsure about the part number? Contact our engineering team for exact cross-reference matching.
Flexible Solutions: Providing Genuine, OEM, and premium Aftermarket spare parts to fit your budget.