Cylinder Block

WARNING: This page is about a different variant/trim than selected.

Visually check the cylinder block for scratch, rust and corrosion. Use a flaw detecting agent to check for cracks. If it is found faulty, repair or replace it.
Measure distortion on the top surface of the cylinder block using a straight edge and thickness gauge.
If distortion exceeds the limit, grind and repair it.

A gasket or the like must not be adhered to the top surface of the cylinder block during measurement.

Distortion on bottom

Standard value: Within 0.05 mm (0.002 inch)

Limit: 0.2 mm (0.01 inch)

Grinding limit: 0.2 mm (0.01 inch)

Fig 1: Measuring Cylinder Block Distortion Using Straight Edge
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Check the cylinder bore for scoring or seizure. If faulty replace.
Measure the bore and cylindricity of the cylinder using a cylinder gauge.
If the cylinder is excessively worn, repair the cylinder and replace the piston and piston rings.

Measuring points are as shown in the illustration.

Standard value

Cylinder bore: 86 mm (3.4 inches)

Cylindricity: 0.010 mm or less (0.0004 inch)

Fig 2: Identifying Measuring Points Of Bore Using Cylinder Gauge
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.