Operation 4-8 To inspect

Piston and piston ring

To inspect

Operation 4-8

Piston

If the outer surface of the piston is damaged (cracked, scored, burning etc) renew.

Piston skirt

Check the larger diameter of the piston skirt (10 mm from bottom). Check the inside diameter (thrust direction) of the cylinder. Calculate the clearance between the cylinder and the piston. If the clearance is more than the service limit, or piston diameter is less than service limit, renew the piston

Engine Cylinder diameter Service limit

403C-11 76,932 - 76,947 mm (3.02880 - 3.02940 in)76,7 mm (3.020 in) 403C-15 404C-22 404C-22T 83,948 - 83,963 mm (3.30503 - 3.30562 in)83,7 mm (3.295 in)

Engine Clearance between piston and cylinder Service limit

403C-11 0,0525 - 0,0865 mm (0.00210 - 0.00340 in)0,25 mm (0.010 in) 403C-15 404C-22 404C-22T 0,0380 - 0,0720 mm (0.00150 - 0.00283 in)0,25 mm (0.010 in)