advance piston ring (7) to the middle of the cylinder with a piston (8).
With a set of probes (9) measure the gap of the ring in the lock.
M4R engine:
- upper compression ring - the gap is from 0.20 to 0.51 mm;
- lower compression ring - the gap is from 0.50 to 0.83 mm;
- oil scraper ring - the gap is from 0.15 to 0.78 mm.
H4J engine:
- upper compression ring - the gap is from 0.20 to 0.30 mm;
- lower compression ring - the gap is from 0.35-0.50 mm;
- oil scraper ring - the gap is from 0.20 to 0.60 mm.