Piston rings — check

1. Check the piston rings for excessive wear, damage or breaks and replace with new ones if defective. If the piston was replaced, it was necessary to replace the piston rings as well.

2. Check piston ring clearance (pic. 3.54). If the value is out of range, replace the piston ring, piston, or both.



Normal Clearance:

• Top compression ring: 0.03-0.07mm.
• Lower compression ring: 0.02-0.06mm.

Permissible clearance:

• Top compression ring: 0.1 mm.
• Lower compression ring: 0.1 mm.

Options	Nominal value, mm	Limit value, mm
Top compression ring	0.20-0.35	0.8
Lower compression ring	0.35-0.50	0.8
Oil scraper ring SOHC 12V, DOHC	0.20-0.50	1.0
Oil scraper ring SOHC 16V	0.10-0.40	1.0

3. Install the piston ring in the cylinder bore.

4. Press the piston ring with the piston so that it is at right angles to the bore of the cylinder (pic. 3.55). Then measure the piston ring gap with a gauge.



If the clearance is too large, replace the piston ring.