Updated specs are available.
Valve stem to guide clearance — standard and maximum (NA6)
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Not yet checked against the factory manual for your car's year. It's verified in the 1990 Mazda MX-5 Miata Workshop Manual; later manuals may differ.
Clearance IN: 0.0010–0.0024 in (0.025–0.060 mm) EX: 0.0012–0.0026 in (0.030–0.065 mm) Maximum: 0.008 in (0.20 mm)Clearance IN: 0.025–0.060 mm (0.0010–0.0024 in) EX: 0.030–0.065 mm (0.0012–0.0026 in) Maximum: 0.20 mm (0.008 in)
Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure
Subtract the measured valve-stem outside diameter from the corresponding guide inside diameter. Replace valve and/or guide when clearance exceeds specification.
Applies to
- NA 1990–1993 (B6) — Other years inferred from 1990 factory evidence.
- Verified in: 1990 Mazda MX-5 Miata Workshop Manual
Sources (1)
View 1 source citations
Page B–49 (PDF p. 76) · Printed value & notes
Part no. 1193-10-89CPage B–49 (PDF p. 76)Printed: “Clearance IN: 0.025—0.060mm (0.0010—0.0024 in) EX: 0.030—0.065mm (0.0012—0.0026 in) Maximum: 0.20mm (0.008 in)”
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