Manual

Engine Maintenance And Servicing Manual
Fig.51
Fig.52
Unit: mm
480E *dia. of piston skirt (mm)
Factory
group
1 79.915 – 79.925
2 79.925 – 89.935
3 79.935 – 79.945
4 79.945 – 79.955
Factory
repair
A 80.205 – 80.215
B 80.215 – 80.225
C 80.225 – 80.235
Spare
parts
Standard 79.965 – 79.975
Oversize 0.29 80.245 – 80.255
Oversize 0.5 80.465 – 80.475
* 480M piston should be applied on 480E engine
– Measure the diameter. of the hole of piston pin
Unit: mm
480 diameter of the piston pin hole
White 20.630 – 20.633
Red 20.633 – 20.636
Blue 20.636 – 20.639
– Measure the diameter of piston pin
Unit: mm
480 diameter of the piston pin hole
White 20.622 – 20.625
Red 20.625 – 20.628
Blue 20.628 – 20.631
– Measure cotter intermission of piston ring
First compression ring 0.30 – 0.50mm
Second compression ring 0.30 – 0.50mm
Steel combination oil ring 0.40 – 1.40mm
– Measure the piston ring end play in the piston groove
Unit: mm
Piston ring
height
Piston ring
groove size
Fit clearance
First compression
ring
1.60 0
- 0.012
1.6 + 0.06
+ 0.04
0.050 – 0.082
Second track
compression ring
2.0 0
- 0.012
2.0 + 0.06
+ 0.04
0.050 – 0.082
Oil control ring
blade
0.61 ± 0.025
4.0 + 0.03
0.01
0.01 – 0.23
Oil control ring 2.68 ± 0.05
Cast iron oil control
ring
4.0 - 0.015
- 0.025
4.0 + 0.03
+ 0.01
0.025 – 0.055