# Generator belt deflection — new (NB1)

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

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

Confidence: fsm

5.5—7.0 {0.22—0.27} mm {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": "generator-belt-deflection-new-nb1",
  "name": "Generator belt deflection — 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": "5.5—7.0 {0.22—0.27} mm {in}",
  "procedure": {
    "notes": "Check engine cold or at least 30 min after stopping. New means used on a running engine for less than five minutes. Apply 98 N {10 kgf, 22 lbf} midway between the specified pulleys. Deflection limit is a maximum."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1999",
      "page": "01–10–1 (PDF p. 196)",
      "as_printed": "Deflection\nmm {in}\nGenerator\n*New\n5.5—7.0 {0.22—0.27}",
      "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-deflection-new-nb1/"
}
```