Pistons (Engine Capacities)

Fig 1: Checking Piston Diameter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Bore (D) in mm

Standard	B5204T5 Measured 16 mm from the bottom of the piston	B5234T3 Measured 42 mm from the top of the piston	B5244T2 Measured 42 mm from the top of the piston	B5244T3 Measured 38 mm from the top of the piston	B5254Tx
C-marked 1	80.980-80.990	80.980-80.990	82.980-82.990	82.980-82.990
D-marked 1	80.990-81.000	80.990-81.000	82.990-83.000	82.990-83.000
E-marked 1	81.000-81.010	81.000-81.010	83.000-83.010	83.000-83.010

1 Classification is marked on the top of the piston.

Fig 2: Calculating Running Clearance Of Piston

Courtesy of VOLVO CARS OF NORTH AMERICA.

Piston running clearance (example)

Measured cylinder diameter	83.015 mm
Measured piston diameter	82.995 mm
The piston running clearance is........	0.020 mm
The piston running clearance must be 0.010-0.030 mm.

Piston rings

Fig 3: Checking Piston Ring Axial Clearance

Courtesy of VOLVO CARS OF NORTH AMERICA.

Axial clearance

Upper compression ring........0.030-0.070 mm

Lower compression ring........0.030-0.070 mm

Oil control ring assembly........0.038-0.142 mm

Compression ring dimension

Upper........1,200 -0.010/-0.030 mm

Lower........1,500 -0.010/-0.030 mm

Dimension, three piece oil ring

Spring........1.510 0.020 mm

Rail........0.460 0.011 mm

Piston pin