# Synchronizer ring to gear flank clearances (Y16M-D 6MT)

Canonical URL: https://miatatorque.com/spec/y16m-synchronizer-ring-clearance/

Applicability: NB 2001–2005 (BP-Z3, 6MT) — 2003 factory component-manual evidence; other years inferred within the 2001–2005 normally aspirated NB2 family. Does not infer MSM.

Confidence: fsm

1st/2nd/3rd gears: inner ring 0.98–1.62 mm; middle ring 0.68–1.92 mm; synchronizer ring 0.88–1.72 mm. 4th/5th: 0.80–1.60 mm. 6th/reverse: 0.88–1.52 mm.

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": "y16m-synchronizer-ring-clearance",
  "name": "Synchronizer ring to gear flank clearances (Y16M-D 6MT)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        2001,
        2005
      ],
      "engines": [
        "BP-Z3"
      ],
      "trans": [
        "6MT"
      ],
      "note": "2003 factory component-manual evidence; other years inferred within the 2001–2005 normally aspirated NB2 family. Does not infer MSM."
    }
  ],
  "kind": "non-torque",
  "value_text": "1st/2nd/3rd gears: inner ring 0.98–1.62 mm; middle ring 0.68–1.92 mm; synchronizer ring 0.88–1.72 mm. 4th/5th: 0.80–1.60 mm. 6th/reverse: 0.88–1.52 mm.",
  "procedure": {
    "notes": "Set the ring evenly in its gear and measure the ring-to-gear-flank clearance around the entire circumference with a feeler gauge. Each of the first three rows applies to all first, second and third gears. Replace the ring if outside specification. Printed inch limits are coarse and sometimes inconsistent; metric controls. Normally aspirated NB2 6MT only; actual 2003 evidence, other 2001–2005 years inferred."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "workshop-y16m-d-2003",
      "page": "05–11–13 (PDF p. 26); 05–50–1 (PDF p. 46)",
      "as_printed": "Clearance\n(mm {in})\n1st 2nd 3rd\nInner ring 0.98—1.62 {0.04—0.06}\nMiddle ring 0.68—1.92 {0.03—0.07}\nSynchronizer ring 0.88—1.72 {0.04—0.06}\n4th 5th 0.80—1.60 {0.04—0.06}\n6th Reverse 0.88—1.52 {0.04—0.05}",
      "verified_years": [
        2003,
        2003
      ],
      "document": {
        "id": "workshop-y16m-d-2003",
        "tier": 1,
        "title": "Mazda Y16M-D Manual Transmission Workshop Manual, March 2003",
        "part_number": "9999-95-T15M-D",
        "covers": [
          {
            "gen": "NB",
            "years": [
              2003,
              2003
            ],
            "engines": [
              "BP-Z3"
            ],
            "trans": [
              "6MT"
            ]
          }
        ]
      }
    }
  ],
  "jobs": [],
  "system": "transmission",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/y16m-synchronizer-ring-clearance/"
}
```