Description
Product Overview
Part Name: Timing Belt / Auxiliary Drive Belt Tensioner Pulley
Part Numbers: 38667 / A4722000170 / A4722000270 / EA4722000470
Vehicle Compatibility: Designed for Freightliner Cascadia, Coronado, and Columbia trucks equipped with Detroit Diesel DD13, DD15, and DD16 engines from 2008–2024. These tensioner references are widely used across multiple Freightliner DD-series platforms to control belt tension for timing and accessory drive systems.
Configuration: Engineered with a high-strength cast bracket, sealed heavy-duty bearing, reinforced torsion spring and precision-machined pulley surface. Ensures quiet operation, optimal belt alignment and consistent tension under continuous long-haul operation and rapid temperature changes.
Function: Maintains proper tension on the timing/auxiliary belt, preventing belt slip, vibration, premature wear, overheating and timing deviation. Supports stable operation of the alternator, coolant pump, fuel pump, A/C compressor and other engine accessories.
Technical Specifications
Type: Engine belt tensioner pulley
Material: Heat-treated steel pulley with sealed high-load bearing and corrosion-resistant bracket
Application: Fits Freightliner trucks using Detroit Diesel DD13/DD15/DD16 engines matching the listed part numbers
Cross-Reference: Interchangeable with OE tensioners having equivalent pulley diameter, bracket geometry and spring tension characteristics
Installation: Replace during belt service interval or when noise, wobble, misalignment, bearing failure or inconsistent belt tension is detected
Service Interval: Generally replaced every 120,000–200,000 km depending on duty cycle and engine environment
Delivery & Availability
Stock Options: Tensioner pulleys available from active inventory
Delivery Time: 3–7 days internationally
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