Details

• Brand:

  

  

• SKU:

  ML3Z-6K255-B

• Positions: Right
• Other Names:

  Guide, Arm Timing Chain Tensioner

• Description:

  This is a genuine Ford engine timing chain tensioner arm, the pivoting guide arm the hydraulic tensioner pushes against to keep the timing chain under correct tension on the 2021 through 2025 F-150. Cataloged as the Arm - Timing Chain Tensioner for the right-hand cylinder bank, it rides against the chain and applies smooth, controlled pressure so valve timing stays precise as the chain stretches with mileage. A worn tensioner arm shows a grooved or scored wear face, and a failing guide lets the chain slap, producing a rattle or whine on cold start, a chain-related timing code, and in severe cases skipped timing that can damage valves and pistons. Ford builds this arm with a durable low-friction wear surface bonded to a rigid backing so it maintains its profile through the life of the chain. Because the timing components on both banks age together under identical operating conditions, it is strongly recommended to replace the tensioner arm on the opposite bank, along with the hydraulic tensioners, guides, and chain, during the same service rather than reusing worn parts alongside a new one. Verify the arm profile and pivot match your engine, prime the hydraulic tensioner and confirm free arm movement before final assembly, and set timing to Ford specification. Installing the correct factory tensioner arm restores quiet, accurate valve timing and protects the engine from the consequences of a loose or jumped chain. This OEM part is built to the original Ford engineering specification for a correct fit and long service life.

• Applications: 3.5L.

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