# Generator belt tension — limit (NB2 and Mazdaspeed)

Canonical URL: https://miatatorque.com/spec/generator-belt-tension-limit-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

N {kgf, lbf}: 343 {35, 77}

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": "generator-belt-tension-limit-nb2",
  "name": "Generator belt tension — limit (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": "N {kgf, lbf}: 343 {35, 77}",
  "procedure": {
    "notes": "Check with engine cold or at least 30 min after stopping. New means run for less than 5 min. Use the factory belt-tension gauge between any two pulleys; tension is an alternative to deflection inspection. 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": "Drive Belt Inspection (PDF p. 611)",
      "as_printed": "Tension\nN {kgf, lbf}\nGenerator\nLimit\n343 {35, 77}",
      "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": "Drive Belt Inspection; Engine Technical Data (PDF p. 1045) (PDF p. 693)",
      "as_printed": "Tension\nN {kgf, lbf}\nGenerator\nLimit\n343 {35, 77}",
      "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/generator-belt-tension-limit-nb2/"
}
```