# Crankshaft standard main journal diameter (Mazdaspeed)

Canonical URL: https://miatatorque.com/spec/crankshaft-main-journal-diameter-msm/

Applicability: NB 2004–2005 (BP-Z3-TURBO) — 2004 factory turbo-engine evidence; 2005 inferred within MSM family.

Confidence: fsm

Main Journal
mm {in}
Bearing size Diameter
Standard 49.938—49.956
{1.9661—1.9667}

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": "crankshaft-main-journal-diameter-msm",
  "name": "Crankshaft standard main journal diameter (Mazdaspeed)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        2004,
        2005
      ],
      "engines": [
        "BP-Z3-TURBO"
      ],
      "note": "2004 factory turbo-engine evidence; 2005 inferred within MSM family."
    }
  ],
  "kind": "non-torque",
  "value_text": "Main Journal\nmm {in}\nBearing size Diameter\nStandard 49.938—49.956\n{1.9661—1.9667}",
  "procedure": {
    "notes": "Measure X and Y at both axial points. This record is for standard journals only."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "workshop-bp-turbo-2004",
      "page": "01–10–24 (PDF p. 36)",
      "as_printed": "Main Journal\nmm {in}\nBearing size Diameter\nStandard 49.938—49.956\n{1.9661—1.9667}",
      "verified_years": [
        2004,
        2004
      ],
      "document": {
        "id": "workshop-bp-turbo-2004",
        "tier": 1,
        "title": "2004 Mazda Engine Workshop Manual BP (1.8L), normally aspirated and turbo",
        "part_number": "9999-95-EWBP-04",
        "covers": [
          {
            "gen": "NB",
            "years": [
              2004,
              2004
            ],
            "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/crankshaft-main-journal-diameter-msm/"
}
```