Tensioner Tension Pulley YS338 For FORD
The DUHUI Bearing YS338 drive belt idler pulley is an OE-spec replacement component for the accessory drive belt system on select Ford models equipped with 5.0L V8 engines. This idler pulley ensures proper serpentine belt routing and maintains correct belt tension, ensuring reliable alternator, air conditioning compressor, and power steering pump operation. Manufactured to match original equipment specifications including YS338 and AL3Z8678A, this unit delivers reliable performance for Ford performance applications.
Technical Specifications
| Specification | Value / Detail |
|---|---|
| DH Code | |
| Part Number | YS338 |
| Outer Diameter | 76.50 mm (3.012 inch) |
| Product Type | Idler Pulley / Deflection Pulley |
Important: All information on this page is for reference only. Please verify OE numbers, dimensions, and vehicle fitment against your original part before ordering. Contact us for fitment confirmation.
DH Code & OE Numbers & Reference Numbers
DH Code:
OE Numbers: YS338, AL3Z8678A
Reference Numbers (Interchange):
Ford: AL3Z-8678-A
Ford: YS-338
Motorcraft: YS338
Vehicle Fitment
FORD MUSTANG: 5.0L V8 2018
FORD F-150: 5.0L V8 2018-2020
FORD: Compatible vehicles with 5.0L V8 Coyote engines
Please verify OE number, dimensions and vehicle configuration before ordering.
Product Features
- Direct OE replacement for Ford applications with YS338 / AL3Z8678A.
- Designed for accessory drive belt (serpentine belt) guidance, maintaining proper belt routing for alternator, A/C compressor, and power steering pump operation.
- Cross-references with multiple Ford OE numbers for easy interchangeability in the aftermarket.
- Premium sealed bearing protects from contaminants and ensures long service life.
- OE-compatible replacement for original part numbers YS338 and AL3Z8678A.
Installation Notes
- This pulley is designed for the accessory drive belt system on Ford models equipped with 5.0L V8 engines.
- Before removal, locate the OE belt routing diagram under the hood or make a sketch of the belt path.
- Use appropriate tools to safely relieve tension – never cut or pry the belt off while under tension.
- When replacing the pulley, it is recommended to inspect the serpentine belt for wear and replace it if necessary.
- Ensure the mounting surface is clean and free of debris before installing the new unit.
- Torque mounting bolt to manufacturer specifications – verify appropriate torque for your specific engine application.
- After installation, ensure the belt is properly seated in all pulley grooves and tracking correctly. Start engine briefly, shut off, and recheck belt alignment.
About DUHUI Bearing
Manufactured by DUHUI Bearing – an automotive bearing supplier established in Zhejiang, China, in 2003. DUHUI produces idler pulleys, tensioner pulleys, and wheel bearing assemblies to OE specifications. Contact us
