# Mainshaft runout — maximum (Y16M-D 6MT)

Canonical URL: https://miatatorque.com/spec/y16m-mainshaft-runout-limit/

Applicability: NB 2001–2005 (BP-Z3, 6MT) — 2003 factory component-manual evidence; other years inferred within the 2001–2005 normally aspirated NB2 family. Does not infer MSM.

Confidence: fsm

Maximum runout
0.03 mm {0.0012 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": "y16m-mainshaft-runout-limit",
  "name": "Mainshaft runout — maximum (Y16M-D 6MT)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        2001,
        2005
      ],
      "engines": [
        "BP-Z3"
      ],
      "trans": [
        "6MT"
      ],
      "note": "2003 factory component-manual evidence; other years inferred within the 2001–2005 normally aspirated NB2 family. Does not infer MSM."
    }
  ],
  "kind": "non-torque",
  "value_text": "Maximum runout\n0.03 mm {0.0012 in}",
  "procedure": {
    "notes": "Support the mainshaft on V-blocks and measure runout with a dial gauge at the factory journal positions. This is a maximum service limit. Replace the shaft if exceeded. Normally aspirated NB2 6MT only; actual 2003 evidence, other 2001–2005 years inferred."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "workshop-y16m-d-2003",
      "page": "05–11–13 (PDF p. 26); 05–50–1 (PDF p. 46)",
      "as_printed": "Maximum runout\n0.03 mm {0.0012 in}",
      "verified_years": [
        2003,
        2003
      ],
      "document": {
        "id": "workshop-y16m-d-2003",
        "tier": 1,
        "title": "Mazda Y16M-D Manual Transmission Workshop Manual, March 2003",
        "part_number": "9999-95-T15M-D",
        "covers": [
          {
            "gen": "NB",
            "years": [
              2003,
              2003
            ],
            "engines": [
              "BP-Z3"
            ],
            "trans": [
              "6MT"
            ]
          }
        ]
      }
    }
  ],
  "jobs": [],
  "system": "transmission",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/y16m-mainshaft-runout-limit/"
}
```