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Home >> Acura >> 2005 >> TSX Automatic >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Cylinder Head >> Camshaft Inspection

Camshaft Inspection

NOTE: Do not rotate the camshaft during inspection.
  1. Remove the rocker arm assembly (see ROCKER ARM ASSEMBLY REMOVAL  ).
  2. 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 mm Bolts: 22 N.m (2.2 kgf.m, 16 lbf.ft) 
    • 6 mm Bolts: 12 N.m (1.2 kgf.m, 8.8 lbf.ft) 
    • 6 mm Bolts: (21), (22), (23) 
    Fig 1: Tightening Bolts In Sequence
    G05490132Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Seat the camshaft by pushing it away from the camshaft pulley end of the cylinder head.
  4. 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.) 

    Fig 2: Checking Camshaft End Play
    G05490133Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Loosen the camshaft holder bolts two turns at a time, in a crisscross pattern. Then remove the camshaft holders from the cylinder head.
  6. 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.
  7. Clean the camshaft journal surfaces in the cylinder head, then set the camshafts back in place. Place a plastigage strip across each journal.
  8. Install the camshaft holders, then tighten the bolts to the specified sequence as shown in step  2.
  9. 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.) 

    Fig 3: Measuring Widest Portion Of Plastigage
    G05490134Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. 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.) 

    Fig 4: Checking Camshaft Total Runout
    G05490135Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Measure cam lobe height.

    Cam Lobe Height Standard (New): 

    CAM LOBE HEIGHT SPECIFICATION

      INTAKE EXHAUST
    PRI 33.416 mm (1.3156 in.) 32.994 mm (1.2990 in.)
    MID 35.032 mm (1.3792 in.) 35.090 mm (1.3815 in.)
    SEC 33.416 mm (1.3156 in.) 32.994 mm (1.2990 in.)
    PRI: Primary
    MID: Mid
    SEC: Secondary
    C/C: Cam Chain
    Fig 5: Measuring Cam Lobe Height
    G05490136Courtesy of AMERICAN HONDA MOTOR CO., INC.
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