CAMSHAFT INSPECTION

PROCEDURE


  1. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY


    1. Check the lock of camshaft timing gear assembly.


      1. Clamp the camshaft in a vise and confirm that it is locked.

        Note

        Do not damage the camshaft.

    2. Release the lock pin.


      1. A005M2ZE21
        Text in Illustration
        *1 Rubber Piece
        *2 Vinyl Tape
        *a Advance Side Path
        *b Retard Side Path
        *c Open
        *d Close

        Cover the 4 oil paths of the cam journal with tape as shown in the illustration.

        Tech Tips

        One of the 2 grooves located on the cam journal is for retarding cam timing (upper) and the other is for advancing cam timing (lower). Each groove has 2 oil paths. Plug one of the oil paths for each groove with a piece of rubber before wrapping the cam journal with the tape.

      2. Puncture the tape covering the advance oil path and the retard oil path on the opposite side from the advance oil path.

      3. A005M6FE04
        Text in Illustration
        *a Advance Side Path
        *b Retard Side Path

        Apply air at about 150 kPa (1.5 kgf/cm2, 21.8 psi) pressure into the 2 broken paths (the advance side path and the retard side path).

        Note

        Cover the paths with a piece of cloth to prevent oil splashes.

      4. A005KUJE04
        Text in Illustration
        *a Advance Side Path
        *b Retard Side Path
        *c Hold Pressure
        *d Decompress

        Confirm that the camshaft timing gear assembly revolves in the timing advance direction when the air pressure on the timing retard path is reduced.

        Tech Tips

        The lock pin is released, and the camshaft timing gear revolves in the advance direction.

      5. When the camshaft timing gear reaches the most advanced position, release the air pressure on the timing retard side path, and then release the air pressure on the timing advance side path.

        Note

        The camshaft timing gear assembly may shift to the retard side abruptly if the air pressure on the advance side path is released first. This may result in breakage of the lock pin.

    3. Check the rotation.


      1. Rotate the camshaft timing gear assembly back and forth several times, except where the lock pin meets it at the most retarded angle. Check the movable range and that it rotates smoothly.

        Standard
        Smooth movable range is about 22.5°.

        Note

        Perform this check by hand, instead of using air pressure.

    4. Check the lock in the most retarded position.


      1. Confirm that the camshaft timing gear assembly is locked in the most retarded position.

  2. INSPECT CAMSHAFT

    A005KJK

    1. Inspect the camshaft for runout.


      1. Place the camshaft on V-blocks.

      2. Using a dial indicator, measure the circle runout at the center journal.

        Maximum circle runout
        0.03 mm (0.0012 in.)

        If the circle runout is greater than the maximum, replace the camshaft.

    2. A005LT0

      Inspect the cam lobes.


      1. Using a micrometer, measure the cam lobe height.

        Standard cam lobe height
        41.640 to 41.740 mm (1.6394 to 1.6433 in.)
        Minimum cam lobe height
        41.540 mm (1.6354 in.)

        If the cam lobe height is less than the minimum, replace the camshaft.

    3. A005L20

      Inspect the camshaft journals.


      1. Using a micrometer, measure the journal diameter.

        Standard journal diameter
        Journal Specified Condition
        No. 1 journal

        34.449 to 34.465 mm

        (1.3563 to 1.3569 in.)
        Other journals

        22.959 to 22.975 mm

        (0.9038 to 0.9045 in.)

        If the journal diameter is not as specified, check the oil clearance.

  3. INSPECT NO. 2 CAMSHAFT


    1. Inspect the No. 2 camshaft for runout.


      1. Place the No. 2 camshaft on V-blocks.

      2. Using a dial indicator, measure the circle runout at the center journal.

        Maximum circle runout
        0.03 mm (0.0012 in.)

        If the circle runout is greater than the maximum, replace the No. 2 camshaft.

    2. Inspect the cam lobes.


      1. Using a micrometer, measure the cam lobe height.

        Standard cam lobe height
        40.793 to 40.893 (1.6060 to 1.6100 in.)
        Minimum cam lobe height
        40.693 mm (1.6021 in.)

        If the cam lobe height is less than the minimum, replace the No. 2 camshaft.

    3. Inspect the camshaft journals.


      1. Using a micrometer, measure the journal diameter.

        Standard journal diameter
        Journal Specified Condition
        No. 1 journal

        34.449 to 34.465 mm

        (1.3563 to 1.3569 in.)
        Other journals

        22.959 to 22.975 mm

        (0.9038 to 0.9045in.)

        If the journal diameter is not as specified, check the oil clearance.