General (B6284T; B6294S; 2000-2001): Specifications: Pistons

Fig 1: Checking Piston Diameter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Piston diameter (D)

Standard	B6284T The diameter is measured 42 mm from the top of the piston	B6294S The diameter is measured 12 mm from the bottom of the piston
C-marked 1	80.98-80.99	82.98-82.99
D-marked 1	80.99-81.00	82.99-83.00
E-marked 1	81.00-81.01	83.00-83.01

1 The 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........	81.015 mm
Measured piston diameter........	80.995 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/-0.030mm

Lower........1.500 -0.010/-0.030mm

Dimension, three piece oil ring

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

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

Piston pin

B6284T

Diameter........23.000 +0/-0.004 mm

Length........61.000 +0/-0.200 mm

B6294S

Diameter........21.000 +0/-0.004 mm

Length........57.000 +0/-0.200 mm