# Piston to cylinder clearance — standard and maximum (NA6)

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

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

Confidence: fsm

Clearance: 0.039–0.052 mm (0.0015–0.0020 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-cylinder-clearance-na6",
  "name": "Piston to cylinder clearance — standard and maximum (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: 0.039–0.052 mm (0.0015–0.0020 in)\nMaximum: 0.15 mm (0.006 in)",
  "procedure": {
    "notes": "Measure piston diameter at 90 degrees to the pin, 16.5 mm (0.650 in) below the oil-ring land lower edge. Replace piston or rebore for oversize pistons if over maximum; replace rings with the piston."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1990",
      "page": "B–56 (PDF p. 83)",
      "as_printed": "Clearance: 0.039—0.052mm (0.0015—0.0020 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-cylinder-clearance-na6/"
}
```