# Generator belt tension — new (NB1)

Canonical URL: https://miatatorque.com/spec/generator-belt-tension-new-nb1/

Applicability: NB 1999–2000 (BP-4W) — Other years inferred from 1999 factory evidence.

Confidence: fsm

491—745 {50—76, 110—167} N {kgf, lbf}

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-new-nb1",
  "name": "Generator belt tension — new (NB1)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        1999,
        2000
      ],
      "engines": [
        "BP-4W"
      ],
      "note": "Other years inferred from 1999 factory evidence."
    }
  ],
  "kind": "non-torque",
  "value_text": "491—745 {50—76, 110—167} N {kgf, lbf}",
  "procedure": {
    "notes": "Check engine cold or at least 30 min after stopping. New means used on a running engine for less than five minutes. Use factory tension gauge between any two pulleys; alternative to deflection inspection. Tension limit is a lower service limit."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1999",
      "page": "01–10–1 (PDF p. 196)",
      "as_printed": "Tension\nN {kgf, lbf}\nGenerator\n*New\n491—745 {50—76, 110—167}",
      "verified_years": [
        1999,
        1999
      ],
      "document": {
        "id": "fsm-1999",
        "tier": 1,
        "title": "1999 Mazda MX-5 Miata Workshop Manual",
        "covers": [
          {
            "gen": "NB",
            "years": [
              1999,
              2000
            ],
            "engines": [
              "BP-4W"
            ]
          }
        ],
        "url": "https://www.mellens.net/mazda/Mazda-Miata-1999-2001.pdf"
      }
    }
  ],
  "jobs": [],
  "system": "engine",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/generator-belt-tension-new-nb1/"
}
```