# Exhaust valve clearance — cold (NB2 and Mazdaspeed)

Canonical URL: https://miatatorque.com/spec/exhaust-valve-clearance-cold-nb2/

Applicability: NB 2001–2005 (BP-Z3) — Other years inferred from 2003 factory evidence.; NB 2004–2005 (BP-Z3-TURBO) — 2005 factory technical data explicitly includes BP WITH TC; 2004 inferred within MSM family.

Confidence: fsm

0.28–0.34 mm {0.011–0.013 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": "exhaust-valve-clearance-cold-nb2",
  "name": "Exhaust valve clearance — cold (NB2 and Mazdaspeed)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        2001,
        2005
      ],
      "engines": [
        "BP-Z3"
      ],
      "note": "Other years inferred from 2003 factory evidence."
    },
    {
      "gen": "NB",
      "years": [
        2004,
        2005
      ],
      "engines": [
        "BP-Z3-TURBO"
      ],
      "note": "2005 factory technical data explicitly includes BP WITH TC; 2004 inferred within MSM family."
    }
  ],
  "kind": "non-torque",
  "value_text": "0.28–0.34 mm {0.011–0.013 in}",
  "procedure": {
    "notes": "Cold engine only. Measure with the relevant cam lobes on their base circles using the factory No.1/No.4 compression-TDC inspection positions; adjust with the correct shim if outside standard. The actual 2005 engine technical-data table explicitly includes BP and BP WITH TC; the displayed setting applies to both."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-2003",
      "page": "Valve Clearance Inspection (PDF p. 579)",
      "as_printed": "Standard [Engine cold]\nEX: 0.28—0.34 mm {0.011—0.013 in} (0.31±0.03 mm {0.012±0.0012 in})",
      "verified_years": [
        2003,
        2003
      ],
      "document": {
        "id": "fsm-2003",
        "tier": 1,
        "title": "2003 Mazda MX-5 Miata Workshop Manual (electronic manual capture)",
        "covers": [
          {
            "gen": "NB",
            "years": [
              2003,
              2003
            ],
            "engines": [
              "BP-Z3"
            ]
          }
        ],
        "note": "Normally aspirated BP procedures audited; turbo procedures are covered separately."
      }
    },
    {
      "source": "fsm-2005",
      "page": "Engine Technical Data (PDF p. 1046)",
      "as_printed": "Valve clearance [Engine cold]\nEX 0.28—0.34 mm {0.011—0.013 in} (0.31±0.03 mm {0.012±0.0012 in})",
      "verified_years": [
        2005,
        2005
      ],
      "document": {
        "id": "fsm-2005",
        "tier": 1,
        "title": "2005 Mazda MX-5 Miata Workshop Manual (electronic manual capture)",
        "covers": [
          {
            "gen": "NB",
            "years": [
              2005,
              2005
            ],
            "engines": [
              "BP-Z3"
            ]
          },
          {
            "gen": "NB",
            "years": [
              2005,
              2005
            ],
            "engines": [
              "BP-Z3-TURBO"
            ],
            "trans": [
              "6MT"
            ]
          }
        ]
      }
    }
  ],
  "jobs": [],
  "system": "engine",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/exhaust-valve-clearance-cold-nb2/"
}
```