6 DF40/DF50 “K3”(‘03) model
CYLINDER/PISTON/PISTON RING
0.060 (0.0024)mm (in)
Limit
Piston ring
end gap
mm (in) 0.10 –0.25 (0.004 –0.010)
Cylinder distortion
Piston to cylinder
clearance
STD
Limit mm (in) 0.70 (0.028)
1st
mm (in) 0.25 –0.40 (0.010 –0.016)
STD
Limit mm (in) 1.00 (0.039)
2nd
Item Unit Data
DF40T/40QH DF50T/50WT/50WQH
mm (in) 0.020 –0.040 (0.0008 –0.0016)
STD
Limit mm (in) 0.100 (0.0039)
71.000 –71.020 (2.7953 –2.7961)mm (in)
STD
Cylinder bore
50 (2.0) from cylinder top surfacemm (in)
Cylinder measuring position
70.970 –70.990 (2.7941 –2.7949)mm (in)
STD
Piston skirt diameter
19 (0.7) from piston skirt endmm (in)
Piston measuring position
0.100 (0.0039)mm (in)
Limit
Cylinder bore wear
Piston ring
free end gap
mm (in) Approx. 7.5 (0.30)
STD
Limit mm (in) 6.0 (0.24)
1st
mm (in) Approx. 11.0 (0.43)
STD
Limit mm (in) 8.8 (0.35)
2nd
Piston ring
groove width
mm (in) 1.01 –1.03 (0.040 –0.041)
1st
mm (in) 1.01 –1.03 (0.040 –0.041)
mm (in) 2.01 –2.03 (0.079 –0.080)
2nd
Oil
Piston ring to
groove
clearance
mm (in) 0.02 –0.06 (0.001 –0.002)
STD
Limit mm (in) 0.10 (0.004)
1st
mm (in) 0.02 –0.06 (0.001 –0.002)
STD
Limit mm (in) 0.10 (0.004)
2nd
Piston ring
thickness
mm (in) 0.97 –0.99 (0.038 –0.039)
STD
STD mm (in) 0.97 –0.99 (0.038 –0.039)
1st
2nd
Pin clearance in
piston pin hole
mm (in) 0.006 –0.018 (0.0002 –0.0007)
STD
Limit mm (in) 0.040 (0.0016)
Piston pin outside
diameter
mm (in) 17.996 –18.000 (0.7085 –0.7087)
STD
Limit mm (in) 17.980 (0.7079)
Piston pin hole
diameter
mm (in) 18.006 –18.014 (0.7089 –0.7092)
STD
Limit mm (in) 18.040 (0.7102)
Pin clearance in
conrod small end
mm (in) 0.003 –0.015 (0.0001 –0.0006)
STD
Limit mm (in) 0.050 (0.0020)
Conrod small end
bore mm (in) 18.003 –18.011 (0.7088 –0.7091)STD
STD
STD
STD
