01-02-2025, 06:25 PM
Colin,
I have notes from long ago which state that the vertical clearance of piston rings in their grooves should be approx 2 -3 thou (measured with feeler gauges). They are worn out when this gap exceeds 6 thou (oil scrapers) or 8 thou (compression rings). Just how "worn out" might be a matter for judgement. If the car was running well I'd leave them alone.
As for availability, if our usual suppliers are unable to help, you could try Cox & Turner - they hold a wide selection, albeit it at a price.
I have notes from long ago which state that the vertical clearance of piston rings in their grooves should be approx 2 -3 thou (measured with feeler gauges). They are worn out when this gap exceeds 6 thou (oil scrapers) or 8 thou (compression rings). Just how "worn out" might be a matter for judgement. If the car was running well I'd leave them alone.
As for availability, if our usual suppliers are unable to help, you could try Cox & Turner - they hold a wide selection, albeit it at a price.