Nissan Micra K11 silhouetteK11

CYLINDER HEAD — Inspection (Cont'd) / Valve Guide Replacement

EM-32prose procedure
Continued from EM-31

Inspection (Cont'd)

Valve guide clearance (continued)

  1. 2
    If it exceeds the limit, check valve to valve guide clearance. (a) Measure valve stem diameter and valve guide inner diameter. (b) Check that clearance is within specification.
    Micrometer measuring outer diameter of a valve stem (held vertically). Callout: "Micrometer".
    SEM938C

Valve to valve guide clearance

Intake
Standard0.020 - 0.050 (0.0008 - 0.0020)
Limit0.110 (0.0043)
Exhaust
Standard0.040 - 0.070 (0.0016 - 0.0028)
Limit0.130 (0.0051)

Valve guide clearance (end)

  1. c
    If it exceeds the limit, replace valve or valve guide.

Valve guide replacement

  1. 1
    To remove valve guide, heat cylinder head to 110 to 120°C (230 to 248°F).
    Cylinder head submerged/heated in an oil bath in a heated tank, oil arrow pointing at the bath. Used to heat the head to 110–120°C to release the valve guides for removal.
    SEM008A
  2. 2
    Press out valve guide or use a hammer and suitable tool.
    Hammer driving a punch/drift into a valve guide on the cylinder head combustion-chamber face to press the old valve guide out. Asterisks (★) on the head indicate heated areas.
    SEM931C
  3. 3
    Ream cylinder head valve guide hole. Valve guide hole diameter (for service parts): Intake & Exhaust — 9.680 - 9.695 mm (0.3811 - 0.3817 in).
    Reamer being run through a valve-guide hole on the cylinder head to size it to the correct diameter for the new service-part valve guide.
    SEM932C
Cylinder head heat temperature for valve guide removalHeat oil bath
110 - 120 (230 - 248)°C (°F)
Valve guide hole diameter (service parts) — Intake & ExhaustAfter reaming
9.680 - 9.695 (0.3811 - 0.3817)mm (in)
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