# Radiator cap pressure test (NA8)

Canonical URL: https://miatatorque.com/spec/radiator-cap-test-pressure-na8/

Applicability: NA 1994–1997 (BP) — Other years inferred from 1994 factory evidence.

Confidence: fsm

73.6–102 kPa {0.75–1.05 kgf/cm², 10.7–14.9 psi}; hold about 10 s

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": "radiator-cap-test-pressure-na8",
  "name": "Radiator cap pressure test (NA8)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1994,
        1997
      ],
      "engines": [
        "BP"
      ],
      "note": "Other years inferred from 1994 factory evidence."
    }
  ],
  "kind": "non-torque",
  "value_text": "73.6–102 kPa {0.75–1.05 kgf/cm², 10.7–14.9 psi}; hold about 10 s",
  "procedure": {
    "notes": "Remove cap only from a cool engine. Clean residue from cap valve and seat. Attach to cap tester with correct adapter, apply pressure gradually and wait about 10 seconds; verify pressure has not decreased. Cap test, not cooling-system leak-test pressure."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1994",
      "page": "E–7 (PDF p. 143)",
      "as_printed": "73.6—102 kPa {0.75—1.05 kgf/cm², 10.7—14.9 psi}",
      "verified_years": [
        1994,
        1994
      ],
      "document": {
        "id": "fsm-1994",
        "tier": 1,
        "title": "1994 Mazda MX-5 Miata Workshop Manual",
        "covers": [
          {
            "gen": "NA",
            "years": [
              1994,
              1997
            ],
            "engines": [
              "BP"
            ]
          }
        ],
        "note": "Mazda's base manual for 1994–97; later model years got supplements, which we haven't checked yet."
      }
    }
  ],
  "jobs": [],
  "system": "cooling",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/radiator-cap-test-pressure-na8/"
}
```