3937553 3967188 3973822 3973823 3978022 47683084 4929688 5333477 6731624110 87326910 87327014 D11862445 J912246 J914086 J918944 J934817 J936203 Engine Drive Belt Idler Tensioner Pulley For 4BT 6BT

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 3937553 3967188 3973822 3973823 3978022 47683084 4929688 5333477 6731624110 87326910 87327014 D11862445 J912246 J914086 J918944 J934817 J936203 is engineered for maximum durability and precise fitment in 4BT 6BT 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: 3937553 3967188 3973822 3973823 3978022 47683084 4929688 5333477 6731624110 87326910 87327014 D11862445 J912246 J914086 J918944 J934817 J936203

Condition: Brand New / High-Quality OEM / Aftermarket
Warranty: 6 Months / 1 Year
Engine Model:  4BT 6BT

Application:

4BT (inline four-cylinder, 3.9L): Primarily used in light commercial vehicles, small engineering vehicles, generator sets, and low-power agricultural machinery, 30–50 kW generator sets, emphasizing fuel economy and compact layout.

6BT (inline six-cylinder, 5.9L, often referred to as "6BT5.9"): Commonly found in medium and heavy-duty trucks, large buses, construction machinery, and high-power generators/marine auxiliary machinery, loaders, and 90–120 kW generator sets, offering stronger torque and smoother operation.

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.