4
400 Series
To measure the piston ring gap
Operation 4-6
If the piston ring is worn or damaged, renew. Piston ring gap Clean the carbon from the top of the cylinder bore. Insert the ring into the cylinder at right angles to the cylinder block and measure the gap with a feeler gauge. If the gap is greater than the service limit, renew the piston ring. Engine 403C11 403C-15 404C-22 404C-22T
Ring number
Standard
Service limit
Number 1 ring
0,15 - 0,27 mm (0.0059 - 0.0106 in)
1,0 mm (0.039 in)
Number 2 ring
0,12 - 0,24 mm (0.0047 - 0.0094 in)
1,0 mm (0.039 in)
Oil control ring
0,20 - 0,35 mm (0.0079 - 0.0138 in)
1,0 mm (0.039 in)
Number 1 ring
0,20 - 0,35 mm (0.0079 - 0.0138 in)
1,0 mm (0.039 in)
Number 2 ring
0,20 - 0,40 mm (0.0079 - 0.0158 in)
1,0 mm (0.039 in)
Oil control ring
0,20 - 0,40 mm (0.0079 - 0.0158 in)
1,0 mm (0.039 in)
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H1059
38
Workshop Manual, TPD 1458E, issue 3 - Perkins Confidential: Green
