# Top and second piston ring to land clearance (NA6)

Canonical URL: https://miatatorque.com/spec/piston-ring-land-clearance-na6/

Applicability: NA 1990–1993 (B6) — Other years inferred from 1990 factory evidence.

Confidence: fsm

Clearance (Top and Second):
0.03–0.07 mm (0.0012–0.0028 in)
Maximum: 0.15 mm (0.006 in)

Always confirm against your factory manual. Match every restriction and follow all stages and procedure notes. Disputed claims must not be automatically resolved. The complete record below preserves every printed unit, source claim and procedure.

```json
{
  "id": "piston-ring-land-clearance-na6",
  "name": "Top and second piston ring to land clearance (NA6)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1990,
        1993
      ],
      "engines": [
        "B6"
      ],
      "note": "Other years inferred from 1990 factory evidence."
    }
  ],
  "kind": "non-torque",
  "value_text": "Clearance (Top and Second):\n0.03–0.07 mm (0.0012–0.0028 in)\nMaximum: 0.15 mm (0.006 in)",
  "procedure": {
    "notes": "Use a new ring and check around the entire circumference; replace the piston if the maximum is exceeded. This is side clearance, not ring end gap."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1990",
      "page": "B–56 (PDF p. 83)",
      "as_printed": "Clearance (Top and Second):\n0.03—0.07mm (0.0012—0.0028 in)\nMaximum: 0.15mm (0.006 in)",
      "verified_years": [
        1990,
        1990
      ],
      "document": {
        "id": "fsm-1990",
        "tier": 1,
        "title": "1990 Mazda MX-5 Miata Workshop Manual",
        "part_number": "1193-10-89C",
        "covers": [
          {
            "gen": "NA",
            "years": [
              1990,
              1990
            ],
            "engines": [
              "B6"
            ]
          }
        ],
        "url": "https://archive.org/details/1990-mazda-mx-5-miata-workshop-manual_202411"
      }
    }
  ],
  "jobs": [],
  "system": "engine",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/piston-ring-land-clearance-na6/"
}
```