# Valve spring loaded height and test force (Mazdaspeed)

Canonical URL: https://miatatorque.com/spec/valve-spring-loaded-height-msm/

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

Confidence: fsm

Pressing force
IN: 172.60—195.15 N
{17.6—19.9 kgf, 38.72—43.78 lbf}
EX: 172.60—195.15 N
{17.6—19.9 kgf, 38.72—43.78 lbf}
Standard height
IN: 39.5 mm {1.56 in}
EX: 39.5 mm {1.56 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": "valve-spring-loaded-height-msm",
  "name": "Valve spring loaded height and test force (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": "Pressing force\nIN: 172.60—195.15 N\n{17.6—19.9 kgf, 38.72—43.78 lbf}\nEX: 172.60—195.15 N\n{17.6—19.9 kgf, 38.72—43.78 lbf}\nStandard height\nIN: 39.5 mm {1.56 in}\nEX: 39.5 mm {1.56 in}",
  "procedure": {
    "notes": "Apply the specified pressing force and measure spring height; this is a loaded measurement, not free length."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "workshop-bp-turbo-2004",
      "page": "01–10–20 (PDF p. 32)",
      "as_printed": "Pressing force\nIN: 172.60—195.15 N\n{17.6—19.9 kgf, 38.72—43.78 lbf}\nEX: 172.60—195.15 N\n{17.6—19.9 kgf, 38.72—43.78 lbf}\nStandard height\nIN: 39.5 mm {1.56 in}\nEX: 39.5 mm {1.56 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/valve-spring-loaded-height-msm/"
}
```