Figure 3.34a. Pistons and connecting rods: 1 - Piston rings; 2 - Retaining ring; 3 - Piston; 4 - Connecting rod; 5 - Oiler; 6.7- Bolts; 8 - Connecting rod cover; 9 - Insert; 10 - Cylinder block; 11 - Piston pin.
Figure 3.34b. Checking the piston ring thermal clearance.
Figure 3.34c. Checking the piston ring clearance by height.
Table 3.6. Piston and piston ring clearance dimensions
| Parameters | Piston diameter | Cylinder diameter |
| Main diameter, mm | 80.96 | 81.01 |
| 1st rem size | 81.21 | 81.26 |
| Parameters | New ring | Permissible wear |
| Piston ring thermal clearance | ||
| Upper compression ring, mm | 0.25-0.45 | 1.0 |
| Lower compression ring, mm | 0.20-0.40 | |
| Oil scraper ring, mm | 0.25-0.50 | |
| Piston ring height clearance | ||
| Upper compression ring, mm | 0.07-0.11 | 0 25 |
| Lower compression ring, mm | 0.05-0.08 | 0.25 |
| Oil scraper ring, mm | 0.03-0.06 | 0.15 |
(The original text is available on the website: www.vwmanual.ru)
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