4
400 Series
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)
40
Workshop Manual, TPD 1458E, issue 3 - Perkins Confidential: Green
