Checking and replacing piston rings (Honda Fit 1)

1. Remove the piston from the cylinder block.

2. Use an expander to remove the piston rings.



3. Clean the piston grooves with a piece of old piston ring. Do not use a wire brush to clean the piston grooves.

The width of the first compression ring is 1 mm, the second - 1.2 mm, the oil scraper ring - 2 mm.

Note: If the piston has been separated from the connecting rod, do not install new piston rings at this stage.

4. Using a piston, push the new ring into the cylinder, 15-20 mm from the bottom.

5. Using a feeler gauge, measure the gap in the piston ring joint.

If the gap is greater than the nominal value, check the cylinder diameter.

If the clearance is greater than maximum, bore the cylinder block.

Piston ring gap:

Upper 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 in the figure.

Note:

• The first compression ring "A" has the mark "R1", the second compression ring "B" has the mark "R".
• The manufacturer's mark "C" must face upwards.

7. Rotate the rings in the grooves and make sure they are not pinched.



8. Position the piston ring locks as shown in the figure.



9. Measure the gap between the new piston ring and the groove using a feeler gauge.

First compression ring:

• nominal clearance - 0.065 - 0.090 mm
• maximum gap - 0.15 mm

Second compression ring:

• nominal gap - 0.030 - 0.055 mm
• maximum gap - 0.13 mm

10. Check the width of the piston pin groove.

Groove width under:

First compression ring:

• nominal - 1.050 - 1.060 mm
• maximum - 1,080 mm

Second compression ring:

• nominal - 1.220-1.230 mm.
• maximum - 1,250 mm

Oil scraper ring:

• nominal - 2.005 - 2.020 mm
• maximum - 2,050 mm

The article was taken from the website hondabook.ru