Showing specs for all NA & NB Miatas

Mazdaspeed valve cover (cylinder head cover) bolts (NB2)

≈44–78 in·lbin·lb5–8.8 N·m5–8.8 N·m≈44–78 in·lb
Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure

Owner selected the BP WITH TC engine-workshop value, 5.0–8.8 N·m, separately from the VVT engine’s 7.8–10.8 N·m record. The vehicle timing diagram also prints 7.8–10.8 N·m; that claim remains cited. Apply liquid gasket at the illustrated corners and tighten progressively in the workshop sequence on PDF p. 18.

Applies to
  • NB 2004–2005 (BP-Z3-TURBO)
  • Verified in: 2005 Mazda MX-5 Miata Workshop Manual (electronic manual capture); 2004 Mazda Engine Workshop Manual BP (1.8L), normally aspirated and turbo
Sources disagree. The factory manual value is shown; other published values are marked below.
Sources
  • 2005 Mazda MX-5 Miata Workshop Manual (electronic manual capture)Tier 1
    Page PDF p. 670
    69–96 in·lb (7.8–10.8 N·m) — differs
    Printed: “7.8—10.8 {80—110, 69—96} N·m {kgf·cm, in·lbf}”
  • 2004 Mazda Engine Workshop Manual BP (1.8L), normally aspirated and turboTier 1
    Part no. 9999-95-EWBP-04
    Page 01–10–3 (PDF p. 15)
    44–78 in·lb (5–8.8 N·m)
    Printed: “5.0—8.8 N·m {50—90 kgf·cm, 44—78 in·lbf}”
    BP WITH TC (Mazdaspeed) applicability; the normally aspirated BP workshop content does not establish applicability to the VVT engine.

Also in Cylinder head & camshafts