Pic. 4.7 a. Piston and connecting rod:
1 - Retaining ring; 2 - Piston pin; 3 - Piston; 4 compression rings; 5 - Oil scraper ring; 6 - Connecting rod; 7 - Connecting rod cover; 8 - Connecting rod bolt; 9 - Cylinder block; 10 - Inserts.
Check of a backlash of piston rings is shown on fig. 4.7 b, checking the clearance between the piston ring and the piston groove - in fig. 4.7 in.
Piston ring clearance
1st compression ring: 0.20-0.50 mm.
2nd compression ring: 0.40-0.70 mm.
Oil scraper ring: 0.25-0.50 mm.
Permissible wear: 1.0 mm.
Gap between piston ring and piston groove
1st compression ring: 0.04-0.08 mm.
2nd compression ring: 0.02-0.06 mm.
Oil scraper ring: not measured.
Permissible wear: 0.15 mm.
Piston and connecting rod dimensions
Dimensions, mm | Piston | Cylinder diameter |
Main size | 76.475 | 76.51 |
Rem. size 1 | 76.725 | 76.76 |
Rem. size 2 | 76.975 | 77.01 |
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