Nissan Micra K11 silhouetteK11

CYLINDER HEAD — Combustion Chamber, Camshaft Visual Check, Camshaft Journal Clearance (Supplement-V)

EM-5025prose procedure

Indirect-injection (IDI) diesel — combustion chambers are separate inserts pressed into the head with a knock pin aligning to a notch.

Continued from EM-5024

Inspection (Cont'd)

COMBUSTION CHAMBER REPLACEMENT

Combustion chamber replacement

  1. 1
    Remove glow plug connecting plate, glow plugs and injection nozzle.
  2. 2
    Heat cylinder head in oil to between 150 and 160°C (302 and 320°F).
  3. 3
    Remove combustion chamber so that cylinder head will not be damaged.
    Be careful not to scratch inside of nozzle hole.
    Cylinder head on bench with a long lever-style remover being inserted through a glow-plug bore to push the combustion chamber out — illustrates combustion-chamber removal (step 3).
    SEM720B
  4. 4
    Install combustion chamber.
    1. a
      Heat cylinder head 150 to 160°C (302 to 320°F) in oil.
    2. b
      Align combustion chamber knock pin with cylinder head notch, and install it into cylinder head using a plastic-tip hammer.
      Combustion chamber protrusion: 0 - 0.03 mm (0.000 - 0.001 in)
      Top view of cylinder-head deck showing a combustion chamber being installed; callouts: 'Knock pin' (on the chamber) and 'Notch' (in the cylinder head) — illustrates step 4b alignment.
      SEM721B

CAMSHAFT VISUAL CHECK

CAMSHAFT JOURNAL CLEARANCE

Using micrometer

Camshaft journal clearance — using micrometer

  1. 1
    Measure the inner diameter of camshaft bearings.
    Standard inner diameter:
    No. 1 (flywheel side): 27.505 - 27.533 mm (1.083 - 1.084 in)
    No. 2: 28.005 - 28.033 mm (1.103 - 1.104 in)
    No. 3: 28.505 - 28.533 mm (1.122 - 1.123 in)
    Cylinder head on bench with hand using an inside-micrometer / bore gauge to measure the camshaft bearing inner diameter — illustrates camshaft-journal-clearance step 1.
    SEM727B
  2. 2
    Measure the outer diameter of camshaft journals.
    Standard outer diameter:
    No. 1 (flywheel side): 27.459 - 27.48 mm (1.0811 - 1.0819 in)
    No. 2: 27.959 - 27.98 mm (1.1007 - 1.1016 in)
    No. 3: 28.459 - 28.48 mm (1.1204 - 1.1213 in)
    Standard clearance: 0.025 - 0.074 mm (0.0010 - 0.0029 in)
    Camshaft journal being measured with an outside micrometer — illustrates camshaft-journal-clearance step 2.
    SEM728B

Camshaft journal — standard inner / outer diameters

No. 1 (flywheel side)
Bearing inner dia. — mm (in)27.505 - 27.533 (1.083 - 1.084)
Journal outer dia. — mm (in)27.459 - 27.48 (1.0811 - 1.0819)
No. 2
Bearing inner dia. — mm (in)28.005 - 28.033 (1.103 - 1.104)
Journal outer dia. — mm (in)27.959 - 27.98 (1.1007 - 1.1016)
No. 3
Bearing inner dia. — mm (in)28.505 - 28.533 (1.122 - 1.123)
Journal outer dia. — mm (in)28.459 - 28.48 (1.1204 - 1.1213)
Combustion chamber protrusion above deckAfter installation
0 - 0.03 (0.000 - 0.001)mm (in)
Cylinder head heating range for chamber R&ROil bath
150 - 160 (302 - 320)°C (°F)
Camshaft journal-to-bearing clearance — standardAll journals
0.025 - 0.074 (0.0010 - 0.0029)mm (in)
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