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Home >> BMW >> 1991 >> 735i >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engines >> Cylinder Block Assembly >> Piston & Rod Assembly

Piston & Rod Assembly

  1. Remove engine. Remove cylinder head, oil pan and oil pump. If necessary, mark rod and rod cap for cylinder identification. Remove rod cap.
  2. Remove ridge at top of cylinder bore. Push piston and rod assembly out top of block. Install rod cap on connecting rod from which removed.
  3. If replacing pistons or rods, ensure they are in same weight class as existing piston or rods. Weight class is stamped on piston crown with a "+" or "-".
  4. Install rings on piston, and space end gaps 120 degrees apart. Coat piston and cylinder walls with engine oil. Install ring compressor on piston.
  5. Install piston and rod assembly with arrow on piston head toward front of engine. Install rod bearings. Using new rod bolts and nuts, install and tighten rod caps.
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