# Camshaft journal oil clearance — standard and maximum (NA6)

Canonical URL: https://miatatorque.com/spec/camshaft-journal-oil-clearance-na6/

Applicability: NA 1990–1993 (B6) — Other years inferred from 1990 factory evidence.

Confidence: fsm

Oil clearance: 0.035–0.081 mm (0.0014–0.0032 in)
Maximum: 0.15 mm (0.006 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": "camshaft-journal-oil-clearance-na6",
  "name": "Camshaft journal oil clearance — standard and maximum (NA6)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1990,
        1993
      ],
      "engines": [
        "B6"
      ],
      "note": "Other years inferred from 1990 factory evidence."
    }
  ],
  "kind": "non-torque",
  "value_text": "Oil clearance: 0.035–0.081 mm (0.0014–0.0032 in)\nMaximum: 0.15 mm (0.006 in)",
  "procedure": {
    "notes": "Use Plastigage with clean, oil-free journals/bearing surfaces and HLA removed. Follow cap numbering, direction and factory tightening order on B–53; replace the cylinder head if clearance exceeds specification."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1990",
      "page": "B–54 (PDF p. 81)",
      "as_printed": "Oil clearance: 0.035—0.081mm (0.0014—0.0032 in)\nMaximum: 0.15mm (0.006 in)",
      "verified_years": [
        1990,
        1990
      ],
      "document": {
        "id": "fsm-1990",
        "tier": 1,
        "title": "1990 Mazda MX-5 Miata Workshop Manual",
        "part_number": "1193-10-89C",
        "covers": [
          {
            "gen": "NA",
            "years": [
              1990,
              1990
            ],
            "engines": [
              "B6"
            ]
          }
        ],
        "url": "https://archive.org/details/1990-mazda-mx-5-miata-workshop-manual_202411"
      }
    }
  ],
  "jobs": [],
  "system": "engine",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/camshaft-journal-oil-clearance-na6/"
}
```