Mazda MX-5 NA silhouetteMX-5 NA

INSPECTION / REPAIR

B-50prose procedure
Continued from B-49

Valve guide height

  1. 8
    Measure the height A of each valve guide. Replace the valve guide if necessary.
    Measuring valve guide protrusion height A from the cylinder head spring seat surface using a depth gauge / vernier caliper. Dimension A is indicated by a bracket between the valve guide top and the head surface.
    05U0BX-126
Height AValve guide
16.8—17.4mm (0.661—0.685 in)

Replacement of valve guide

Removal

Valve guide removal

  1. 1
    Remove the valve guide from the side opposite the combustion chamber with the SST.
    Removing the valve guide from the cylinder head (top, combustion-chamber side facing down) using SST 49 B012 005 driven through the guide from the spring-seat side.
    9MU0B2-112

Installation

Valve guide installation

  1. 1
    Assemble the SST so that depth L is as specified.
    Assembling SST set 49 L012 0A0 for valve guide installation: 49 L012 004 (Nut) at top, 49 L012 003 (Installer) attached, and 49 L012 002 (Body) at bottom. Inset shows the depth L dimension callout used to set installation depth.
    05U0BX-128
  2. 2
    Tighten the locknut.
  3. 3
    Tap the valve guide in from the side opposite the combustion chamber until the SST contacts the cylinder head.
    Driving the valve guide into the cylinder head from the spring-seat side using the assembled SST (49 L012 003 + 49 L012 004 + 49 L012 002) with a hammer until the SST contacts the cylinder head.
    05U0BX-129
  4. 4
    Verify that the valve guide height is within specification.
  5. 5
    If not within specification, repeat Steps 1—4.
Depth LValve guide installation
16.8—17.4mm (0.661—0.685 in)
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