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Home >> BMW >> 1982 >> 733i Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 528E, 633CSI & 733I 6-Cylinder >> Pistons, Pins & Rings >> Fitting Pistons >> 528e Models

528e Models

  1. Arrow on piston heads indicate direction of installation. Weight class is indicated by a "+" or "-" sign. All pistons must be in same weight class.
  2. Measure piston diameter 90° to pin bore near bottom of piston skirt. For Mahle type pistons, measure about 9/16" from bottom of piston skirt. For KS type pistons, measure about 5/16" from bottom of piston skirt.
  3. Measure cylinder bore diameter in line with crankshaft centerline and 90° to crankshaft centerline, at top, middle and bottom of cylinder. Difference between corresponding measurements is out-of-round and must not exceed 0.0012" (0.03 mm).
  4. Difference between top cylinder bore measurement and bottom cylinder bore measurement is taper, and should not exceed 0.0008" (0.02 mm).
  5. Difference between maximum cylinder diameter measurement and piston diameter measurement is piston-to-cylinder bore clearance. If clearance is excessive, bore and hone cylinder block for installation of oversize pistons.
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