CAMSHAFT INSPECTION

PROCEDURE

1. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY

   
   

   1. Check the lock of camshaft timing gear.

      
      

      1. Clamp the camshaft in a vise, and check that the camshaft timing gear is locked.

         Note

         Do not damage the camshaft.

   2. 

      Text in Illustration

      *1	Rubber Piece
      *2	Vinyl Tape
      *a	Advance Side Path
      *b	Retard Side Path
      *c	Open
      *d	Close

      Release the lock pin.

      
      

      1. 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. 

         Text in Illustration

         *a	Advance Side Path
         *b	Retard Side Path

         Apply air at about 150 kPa (1.5 kgf*cm²) 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. 

         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

         Camshaft timing gear assembly occasionally shifts to the retard side abruptly if the air pressure on the advance side path is released first. This often results in breakage of the lock pin.

   3. Check the revolution.

      
      

      1. Rotate the valve timing 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

   

   
   

   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. 

      Inspect the cam lobes.

      
      

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

         Standard cam lobe height
         41.886 to 41.986 mm (1.6491 to 1.6530 in.)

         Minimum cam lobe height
         41.786 mm

         If the cam lobe height is less than the minimum, replace the 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 0.9045 in.)

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

3. INSPECT NO. 2 CAMSHAFT

   
   

   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. Inspect the cam lobes.

      
      

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

         Standard cam lobe height
         41.312 to 41.412 (1.6265 to 1.6304 in.)

         Minimum cam lobe height
         41.212 mm (1.6225 in.)

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