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Home >> BMW >> 1973 >> 3.0CS _NA_, Standard Trans >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> BMW Engines - 2500, 2800, 3.0 & BAVARIA 6 Cylinder >> Timing Chain TENSIONER Removal

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". Piston assembly length should be 2.260 ±.004".
  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: Timing Chain Tensioner Piston Components
    G09325566Courtesy of BMW OF NORTH AMERICA, INC.
  3. Remove valve cover to vent air from piston, install piston, spring with conical end toward plug and slightly tighten plug. Fill oil well with engine oil. 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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