Details

• Brand:

  

  

• SKU:

  HL3Z-6K255-A

• Positions: Left
• Other Names:

  Engine Timing Chain Tensioner, Arm Timing Chain Tensioner

• Description:

  Genuine Ford OEM left-hand timing chain tensioner arm part number HL3Z-6K255-A, the driver-side tension-side guide that controls primary timing chain motion on the 3.5L EcoBoost engine. This tensioner arm fits 17-22 Ford F-150 with the 3.5L EcoBoost, 18-22 Expedition with the 3.5L EcoBoost, and 18-22 Lincoln Navigator with the 3.5L EcoBoost. The tensioner arm is part of the Gen2 3.5L EcoBoost timing system wear set, where the plastic face wears under sustained operation and contributes to the characteristic cold-start timing rattle. The arm pivots against the hydraulic tensioner, maintaining tension on the primary timing chain across the entire engine speed range. Ford technical service bulletins call for replacement of the full timing set including both guides, both tensioner arms, both tensioners, all chains, all phasers, and the related torque-to-yield fasteners as a complete service job. Individual arm replacement is rarely sufficient since wear is typically distributed. Installation requires the full timing service procedure following the workshop manual including timing alignment and tensioner reset. Ships in original Ford packaging with the standard Ford limited parts warranty.

• Applications: 3.5L.

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