Cylinder Block

1. 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.
2. Measure distortion on the top surface of the cylinder block using a straight edge and free 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 (0.0020 inch) 

   Limit: 0.2 mm (0.008 inch) 

   Grinding limit: 0.2 mm (0.008 inch) 

   Fig 1: Measuring Distortion On Top Surface Of Cylinder Block Using Straight Edge And Free Gauge

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. Check the cylinder wall for scratch or seizure. If there is any defect, replace the cylinder block.
4. 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: 88 mm (3.4 inch) 

   Cylindricity: 0.0076 mm (0.0003 inch) 

   Fig 2: Measuring Bore And Out Of Round Of Cylinder Using Cylinder Gauge

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

NOTES