Description
Product Overview
Part Name: Engine Timing / Accessory Drive Belt Tensioner
Part Number: 38667
Vehicle Compatibility: Designed for Freightliner New Cascadia trucks equipped with the Detroit Diesel DD15 engine platform, covering model years 2012–2024. This tensioner maintains stable belt tension across the engine’s accessory drive system, ensuring consistent operation of the alternator, coolant pump, fuel pump and air-conditioning compressor. It is an OEM-equivalent component used across DD15 applications in long-haul and heavy-duty freight operations.
Configuration: Constructed with a reinforced steel pulley, high-load sealed bearing and a precision-calibrated internal torsion spring, the tensioner provides controlled belt pressure and smooth rotation under high-torque and high-temperature operating cycles. The assembly is engineered to minimize belt vibration, prevent slippage, reduce pulley noise and stabilize accessory loads even during rapid changes in engine speed or thermal conditions.
Function: Maintains constant belt tension to preserve correct engine timing input and ensure efficient operation of auxiliary systems. The tensioner enhances engine efficiency, prevents premature belt wear, improves accessory longevity and supports reliable, uninterrupted performance for long-haul freight use.
Technical Specifications
Type: Heavy-duty belt tensioner pulley
Material: Heat-treated steel pulley with high-durability sealed bearing and corrosion-resistant tensioner arm
Application: Fits Freightliner New Cascadia trucks using Detroit Diesel DD15 engines matching OE reference 38667
Cross-Reference: Interchangeable with tensioners sharing the same pulley diameter, bracket geometry, spring force and belt-track alignment specifications used in DD15 applications
Installation: Replace when belt squeal, wobble, pulley noise, vibration, misalignment or tension irregularities are observed; recommended during major belt service intervals
Service Interval: Typically replaced every 160,000–240,000 km depending on load profile, climate and drive-cycle frequency
Delivery & Availability
Stock Options: Belt tensioners available in ready stock
Delivery Time: 3–7 days internationally
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.