# Crankshaft main bearing oil clearance (NA8)

Canonical URL: https://miatatorque.com/spec/crankshaft-main-bearing-oil-clearance-na8/

Applicability: NA 1994–1997 (BP) — Other years inferred from 1994 factory evidence.

Confidence: fsm

Oil clearance: 0.018—0.036mm {0.0008—0.0014 in}
Maximum: 0.10mm {0.004 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-na8",
  "name": "Crankshaft main bearing oil clearance (NA8)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1994,
        1997
      ],
      "engines": [
        "BP"
      ],
      "note": "Other years inferred from 1994 factory evidence."
    }
  ],
  "kind": "non-torque",
  "value_text": "Oil clearance: 0.018—0.036mm {0.0008—0.0014 in}\nMaximum: 0.10mm {0.004 in}",
  "procedure": {
    "notes": "Remove oil/debris; fit grooved upper bearings and thrust bearings with oil grooves facing crankshaft. Place Plastigage axially; do not rotate crank. Install numbered caps in correct orientation and tighten in factory sequence/stages to 54–58 N·m. Read widest and narrowest Plastigage points for minimum and maximum clearance."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1994",
      "page": "B–62 (PDF p. 99)",
      "as_printed": "Oil clearance: 0.018—0.036mm {0.0008—0.0014 in}\nMaximum: 0.10mm {0.004 in}",
      "verified_years": [
        1994,
        1994
      ],
      "document": {
        "id": "fsm-1994",
        "tier": 1,
        "title": "1994 Mazda MX-5 Miata Workshop Manual",
        "covers": [
          {
            "gen": "NA",
            "years": [
              1994,
              1997
            ],
            "engines": [
              "BP"
            ]
          }
        ],
        "note": "Mazda's base manual for 1994–97; later model years got supplements, which we haven't checked yet."
      }
    }
  ],
  "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-na8/"
}
```