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Home >> BMW >> 2017 >> 330i Standard Trans >> Repair and Diagnosis (Single Page) >> Drivelines & Axles >> Axle Shafts >> Technical Data - 3' Series Sedan (4-CYL AWD Mechanical) >> Pistons And Piston Rings

Pistons And Piston Rings

Original piston dimension (new piston) 81.978... 82.016 mm
Piston installation clearance (new piston) 0.03...0.17 mm
Piston installation clearance (worn piston) 0.2...0.20 mm
Permissible total wear tolerance between piston and cylinder (engine operated) 0.25 mm
End clearance of center piston ring 
Before measuring the end clearance, make sure the cylinder is within the permissible tolerance. 0.30 mm...0.45 mm
End clearance of upper piston ring 
Before measuring the end clearance, make sure the cylinder is within the permissible tolerance. 0.15 mm...0.25 mm
Side clearance of center piston ring 
Clean all components before measuring the side clearance. 0.07 mm...0.11 mm
Side clearance of upper piston ring 
Clean all components before measuring the side clearance. 0.07 mm...0.11 mm
Original piston dimension (new piston) 81.978... 82.016 mm
Piston installation clearance (new piston) 0.03...0.17 mm
Piston installation clearance (worn piston) 0.2...0.20 mm
Permissible total wear tolerance between piston and cylinder (engine operated) 0.25 mm