2. Expander remove the piston rings.
3. Clean the piston grooves with a piece of the old piston ring. Do not use a metal brush to clean the piston grooves.
The width of the first compression ring is 1 mm, the second - 1.2 mm, the oil scraper - 2 mm.
Note: If the piston has been disconnected from the connecting rod, do not install new piston rings at this stage.
4. Using a piston, push a new ring into the cylinder without reaching 15-20 mm from the bottom.
5. Using a feeler gauge, measure the clearance in the piston ring lock.
If the clearance is greater than the nominal, check the cylinder diameter.
If the clearance is greater than the maximum, bore the cylinder block.
Piston ring gap:
Top compression:
- nominal - 0.15 - 0.30 mm
- maximum - 0.60 mm
Second compression:
- nominal - 0.35 - 0.50 mm
- maximum - 0.65 mm
Oil scraper:
- nominal - 0.20 - 0.70 mm
- maximum - 0.80 mm
6. Install the compression rings as shown.
Note:
- First compression ring "A" has a label "R1", second compression ring "IN" has a label "R".
- Manufacturer's mark "WITH" should be directed upwards.
7. Rotate the rings in the grooves and make sure they are not pinched.
8. Position the piston ring locks as shown.
1, 3 - oil scraper ring,
2 - the first compression ring,
4 - piston pin,
5 - second compression ring and oil scraper ring expander..
9. Measure the clearance between the new piston ring and groove with a feeler gauge.
First compression ring:
- nominal clearance - 0.065 - 0.090 mm
- maximum clearance - 0.15 mm
Second compression ring:
- nominal clearance - 0.030 - 0.055mm
- maximum clearance - 0.13 mm
10. Check the width of the piston pin groove.
Groove width for:
First compression ring:
- nominal - 1.050 - 1.060 mm
- maximum - 1,080 mm
Second compression ring:
- nominal - 1,220- 1,230mm.
- maximum - 1,250 mm
Oil ring:
- nominal - 2.005 - 2.020 mm
- maximum - 2,050 mm