Gap in the lock
1. Push the new ring into the cylinder using a piston to a depth of 15-20 mm from the bottom.
2. Measure the gap in the piston ring lock using a feeler gauge:
- If the gap is too small, make sure these rings are correct for your engine.
- If the clearance is too large, recheck the cylinder bore against the wear limit specified above. If the wear exceeds the allowable limit, the cylinder block must be rebored.
Piston ring gap:
Replacement
1. Remove the old piston rings using a tool.
2. Clean all ring grooves thoroughly.
Note:
- Use a broken piston ring or a piston ring groove cleaner with a suitable blade.
- The groove width for the upper compression ring is 1.0 mm (D16W1 engine) or 1.2 mm (D16W2 engine).
- The width of the groove for the second compression ring is 1.2 mm (D16W1 engine) or 1.5 mm (D16W2 engine).
- The width of the groove for the oil scraper ring is 2.8 mm.
- File the blade if necessary.
- Do not clean the piston bridges between the ring grooves with a wire brush or deepen the bridges with a cleaning tool.
3. Install the new rings in the required position (see below).
Note:
- Do not reuse old piston rings.
- If it is necessary to separate the piston from the connecting rod, do not install new rings yet.
Clearance between piston ring and piston groove
After installing a new set of rings, measure the gap between the ring and the piston groove:
Clearance between upper compression ring and piston groove
| Engine D16W1 | Engine D16W2 | |
| Standard (new) | 0.035-0.060 mm | 0.030-0.060 mm |
| Limit | 0.13 mm | 0.13 mm |
Clearance between the second compression ring and the piston groove
| Standard (new) | 0.030-0.055 mm |
| Limit | 0.13 mm |
Verification
1. Install the rings as shown in the figure.
Note: Factory markings must face upwards.
Piston ring sizes:
Upper compression (standard)
| A | IN | |
| Engine D16W1 | 2.6 mm | 1.0 mm |
| Engine D16W2 | 2.8 mm | 1.2 mm |
Second compression (standard)
| A | IN | |
| Engine D16W1 | 3.0 mm | 1.2 mm |
| Engine D16W2 | 3.2 mm | 1.5 mm |
1. upper compression; 2. second compression
2. Rotate the rings in the grooves and make sure they do not stick.
1. label; 2. label; 3. gasket; 4. oil scraper ring; 5. second compression ring; 6. Upper compression ring
3. Position the ring locks as shown in the picture.
1. Second compression ring lock; 2. Do not place the lock of any ring on the piston thrust surfaces.; 3. oil scraper ring lock; 4. gasket lock; 5. oil scraper ring lock; 6. Do not place the lock of any ring opposite the piston pin hole.; 7. about 90°; 8. Upper compression ring lock; 9. about 90°
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