Contents: Piston ring clearance ↓ Clearance between piston ring and…↓ Piston and connecting rod sizes ↓
The piston and connecting rod are shown in Fig. 4.7 a.
Fig. 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.
Checking the piston ring clearance is shown in Fig. 4.7 b, checking the clearance between the piston ring and the piston groove is shown in Fig. 4.7 c.
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.
Clearance 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 sizes
| 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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