# Synchronizer ring to gear flank clearance (NA6 5MT)

Canonical URL: https://miatatorque.com/spec/synchronizer-ring-gear-clearance-na6-5mt/

Applicability: NA 1990–1993 (B6, 5MT) — 1991–1993 inferred from 1990 factory evidence; actual-year verification is separate.

Confidence: fsm

Standard 1.5 mm (0.059 in); minimum 0.8 mm (0.031 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": "synchronizer-ring-gear-clearance-na6-5mt",
  "name": "Synchronizer ring to gear flank clearance (NA6 5MT)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1990,
        1993
      ],
      "engines": [
        "B6"
      ],
      "trans": [
        "5MT"
      ],
      "note": "1991–1993 inferred from 1990 factory evidence; actual-year verification is separate."
    }
  ],
  "kind": "non-torque",
  "value_text": "Standard 1.5 mm (0.059 in); minimum 0.8 mm (0.031 in)",
  "procedure": {
    "notes": "Set the synchronizer ring squarely in the gear, then measure clearance to the gear flank around the circumference. Inspect teeth and taper surface for wear or cracks. These limits apply to the NA6 five-speed inspection, not the Y16M-D six-speed."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1990",
      "page": "J–24 (PDF p. 356)",
      "as_printed": "Standard clearance: 1.5mm (0.059 in)\nMinimum: 0.8mm (0.031 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": "transmission",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/synchronizer-ring-gear-clearance-na6-5mt/"
}
```