# Crankshaft main bearing oil clearance (Mazdaspeed)

Canonical URL: https://miatatorque.com/spec/crankshaft-main-bearing-oil-clearance-msm/

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

Confidence: fsm

Standard clearance
0.018—0.036 mm {0.0008—0.0014 in}
Maximum clearance
0.10 mm {0.0039 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": "crankshaft-main-bearing-oil-clearance-msm",
  "name": "Crankshaft main bearing oil clearance (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": "Standard clearance\n0.018—0.036 mm {0.0008—0.0014 in}\nMaximum clearance\n0.10 mm {0.0039 in}",
  "procedure": {
    "notes": "Position Plastigage axially on journals, install caps using the cited assembly procedure, remove caps and measure. Replace bearings or grind for correct undersize bearings if excessive."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "workshop-bp-turbo-2004",
      "page": "01–10–25 (PDF p. 37)",
      "as_printed": "Standard clearance\n0.018—0.036 mm {0.0008—0.0014 in}\nMaximum clearance\n0.10 mm {0.0039 in}",
      "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-bearing-oil-clearance-msm/"
}
```