Perkins 403C-11, Workshop Manual, Page: 47 / 128

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Workshop Manual, TPD 1458E, issue 3 - Perkins Confidential: Green 37
400 Series
To measure the piston ring clearance Operation 4-5
Use a feeler gauge to measure the clearance between the piston ring groove and the piston ring. If the
clearance is greater than the service limit, use a new piston ring and check the clearance again.
If the clearance is within the service limit with a new piston ring, renew the piston rings. If the clearance is
outside the service limit with a new piston ring, renew the piston.
Note: The number 1 piston ring of the 404C-22T is of the ‘keystone’ design, therefore it is difficult to measure
the wear due to it’s position in the piston ring groove. When either number 2 ring or the oil control ring is outside
the service limit renew all rings.
Engine Torque Nm (lbf ft) kgf m Standard Service limit
403C-11
Number 1 ring
0,06 - 0,10 mm
(0.0024 - 0.0039 in)
0,25 (0.0098 in)
Number 2 ring
0,05 - 0,09 mm
(0.0020 - 0.0035 in)
0,25 (0.0098 in)
Oil control ring
0,02 - 0,06 mm
(0.0008 - 0.0024 in)
0,15 (0.0059 in)
403C-15
404C-22
Number 1 ring
0,07 - 0,11 mm
(0.0028 - 0.0043 in)
0,25 (0.0098 in)
Number 2 ring
0,04 - 0,08 mm
(0.0016 - 0.0032 in)
0,25 (0.0098 in)
Oil control ring
0,02 - 0,06 mm
(0.0008 - 0.0024 in)
0,15 (0.0059 in)
404C-22T
Number 2 ring
0,04 - 0,08 mm
(0.0016 - 0.0032 in)
0,25 (0.0098 in)
Oil control ring
0,02 - 0,06 mm
(0.0008 - 0.0024 in)
0,15 (0.0059 in)
H1058