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Timing Chain TENSIONER Removal

  1. Remove tensioner plug, spring and piston. Check length of spring and piston assembly. Length of spring should be 6.122" (155.5 mm). Piston assembly length should be 2.441" (62.0 mm)
  2. Check piston with compressed air to see if air vent slots (see Fig 1) are plugged. Clean slots if air does not pass through. When assembling piston, do not block air vents with disc.
    Fig 1: Exploded View of Timing Chain Tensioner Piston
    G09335048Courtesy of BMW OF NORTH AMERICA, INC.
  3. Install piston, spring with conical end toward plug and slightly tighten plug. Fill oil well full of oil and remove valve cover to vent air from piston. Move tensioning rail back and forth until oil comes out at plug. Tighten plug and reverse removal procedure to install remaining components.
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