Camshaft Inspection
NOTE: Do not rotate the camshaft during inspection.
  1. Put the rocker shaft holders, camshaft, and camshaft holders on the cylinder head, then tighten the bolts in sequence to the specified torque.
    NOTE: If the engine does not have bolt (21), skip it and continue the torque sequence.

    Specified Torque

    8 x 1.25 mm
    22 N·m (2.2 kgf·m, 16 lbf·ft)
    6 x 1.0 mm
    12 N·m (1.2 kgf·m, 8.7 lbf·ft)

    6 x 1.0 mm Bolts:
    (21), (22), (23)

  1. Seat the camshaft by pushing it away from the camshaft pulley end of the cylinder head.
  1. Zero the dial indicator against the end of the camshaft, then push the camshaft back and forth and read the end play. If the end play is beyond the service limit, replace the cylinder head and recheck. If it is still beyond the service limit, replace the camshaft.

    Camshaft End Play

    Standard (New):
    0.05−0.20 mm (0.002−0.008 in.)
    Service Limit:
    0.4 mm (0.02 in.)

  1. Unscrew the camshaft holder bolts two turns at a time, in a crisscross pattern. Then remove the camshaft holders from the cylinder head.
  1. Lift the camshafts out of the cylinder head, wipe them clean, then inspect the lift ramps. Replace the camshaft if any lobes are pitted, scored, or excessively worn.
  1. Clean the camshaft journal surfaces in the cylinder head, then set the camshafts back in place. Place a plastigage strip across each journal.
  1. Install the camshaft holders, then tighten the bolts to the specified torque as shown in Step 2 .
  1. Remove the camshaft holders. Measure the widest portion of plastigage on each journal.
    • If the camshaft-to-holder clearance is within limits, go to Step 11 .
    • If the camshaft-to-holder clearance is beyond the service limit and the camshaft has been replaced, replace the cylinder head.
    • If the camshaft-to-holder clearance is beyond the service limit and the camshaft has not been replaced, go to Step 10 .

    Camshaft-to-Holder Oil Clearance

    Standard (New):
    No. 1 Journal:
    0.030−0.069 mm (0.001−0.003 in.)
    No. 2, 3, 4, 5 Journals:
    0.060−0.099 mm (0.002−0.004 in.)
    Service Limit:
    0.15 mm (0.006 in.)

  1. Check the total runout with the camshaft supported on V-blocks.
    • If the total runout of the camshaft is within the service limit, replace the cylinder head.
    • If the total runout is beyond the service limit, replace the camshaft and recheck the camshaft-to-holder oil clearance. If the oil clearance is still beyond the service limit, replace the cylinder head.

    Camshaft Total Runout

    Standard (New):
    0.03 mm (0.001 in.) max.
    Service Limit:
    0.04 mm (0.002 in.)

  1. Measure cam lobe height.

    Cam Lobe Height Standard (New):

    INTAKE
    EXHAUST
    PRI
    32.791 mm (1.2910 in.)
    32.772 mm (1.2902 in.)
    MID
    35.534 mm (1.3990 in.)
    34.768 mm (1.3688 in.)
    SEC
    32.678 mm (1.2865 in.)
    32.661 mm (1.2859 in.)

    PRI: Primary
    MID: Mid
    SEC: Secondary
    C/C: Cam Chain