4897031 504065878 Engine Drive Belt Idler Pulley For 4ISBe150 4ISBe185 6ISBe250-30

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 4897031 504065878 is engineered for maximum durability and precise fitment in 4ISBe150 4ISBe185 6ISBe250-30 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: 4897031 504065878

Condition: Brand New / High-Quality OEM / Aftermarket
Warranty: 6 Months / 1 Year
Engine Model: 4ISBe150 4ISBe185 6ISBe250-30

Application:

4ISBe150 (usually referring to ISBe150-30, 3.9L inline four-cylinder): Primarily used in light trucks, minibuses, municipal vehicles, and light construction machinery, with a rated power of approximately 110kW (150 hp), matched with 6-8 ton chassis.

4ISBe185 (usually referring to ISBe180/185-30, 3.9L inline four-cylinder): Commonly found in medium and light-duty trucks, school buses, public transport chassis, and medium-sized agricultural machinery, with a power of approximately 136kW (185 hp), suitable for 8-12 ton vehicles.

6ISBe250-30 (5.9L inline six-cylinder): Widely used in heavy-duty trucks (such as 10-25 ton tractors/trucks), large buses, mining/construction vehicles, and stationary generator sets, with a power of 184kW (250 hp) and torque of 950 N·m, belonging to the mainstream heavy-duty truck power category of China III/Euro III.

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