БЛОК ДВИГАТЕЛЯ ПРОВЕРКА

PROCEDURE

INSPECT INJECTION GEAR BEARING
1. Check that the injection gear bearing is not rough or worn.
  
  If necessary, replace the injection gear.
INSPECT NO. 1 IDLE GEAR OIL CLEARANCE
1. Using a cylinder gauge, measure the inside diameter of the idle gear.
  
  Standard idle gear inside diameter
  
  44.000 to 44.025 mm (1.732 to 1.734 in.)
2. Using a micrometer, measure the diameter of the No. 1 idle gear shaft.
  
  Standard idle gear shaft diameter
  
  43.955 to 43.990 mm (1.730 to 1.732 in.)
3. Subtract the No. 1 idle gear shaft diameter measurement from the No. 1 idle gear inside diameter measurement.
  
  Standard oil clearance
  
  0.01 to 0.07 mm (0.000394 to 0.00276 in.)
  
  Maximum oil clearance
  
  0.20 mm (0.00787 in.)
  
  If the oil clearance is more than the maximum, replace the No. 1 idle gear and No. 1 idle gear shaft.
INSPECT INTAKE MANIFOLD
1. Using a precision straightedge and feeler gauge, measure the warpage of the surface of the intake manifold that contacts the cylinder head sub-assembly.
  
  Maximum warpage
  
  0.4 mm (0.0157 in.)
  
  If the warpage is more than the maximum, replace the intake manifold.
INSPECT EXHAUST MANIFOLD
1. Using a precision straightedge and feeler gauge, measure the warpage of the surface of the exhaust manifold that contacts the cylinder head sub-assembly.
  
  Maximum warpage
  
  0.4 mm (0.0157 in.)
  
  If the warpage is more than the maximum, replace the exhaust manifold.
INSPECT INTAKE CAMSHAFT SUB-ASSEMBLY
1. Inspect the circle runout.
  1. Place the intake camshaft sub-assembly on V-blocks.
  2. Using a dial indicator, measure the circle runout at the center journal.
    
    Maximum circle runout
    
    0.03 mm (0.00118 in.)
    
    If the circle runout is more than the maximum, replace the intake camshaft sub-assembly.
2. Inspect the cam lobe height.
  1. Using a micrometer, measure the cam lobe height.
    
    Standard cam lobe height
    
    47.18 to 47.28 mm (1.857 to 1.861 in.)
    
    Minimum cam lobe height
    
    46.76 mm (1.841 in.)
    
    If the cam lobe height is less than the minimum, replace the intake camshaft sub-assembly.
3. Inspect the diameter of the camshaft journal.
  1. Using a micrometer, measure the diameter of the camshaft journal for the camshaft bearing.
    
    Standard diameter
    
    27.969 to 27.985 mm (1.101 to 1.102 in.)
    
    If the diameter is not as specified, check the camshaft oil clearance.
4. Using a dial indicator, measure the backlash.
  1. Install the 2 camshaft sub-assemblies.
  2. Using a dial indicator, measure the backlash.
    
    Standard backlash
    
    0.035 to 0.089 mm (0.00138 to 0.00350 in.)
    
    Maximum backlash
    
    0.189 mm (0.00744 in.)
    
    If the backlash is more than the maximum, replace the 2 camshaft sub-assemblies.
  3. Remove the 2 camshafts sub-assemblies.
INSPECT EXHAUST CAMSHAFT SUB-ASSEMBLY
1. Inspect the circle runout.
  1. Place the exhaust camshaft sub-assembly on V-blocks.
  2. Using a dial indicator, measure the circle runout at the center journal.
    
    Maximum circle runout
    
    0.03 mm (0.00118 in.)
    
    If the circle runout is more than the maximum, replace the exhasut camshaft sub-sssembly.
2. Inspect the cam lobe height.
  1. Using a micrometer, measure the cam lobe height.
    
    Standard cam lobe height
    
    48.07 to 48.17 mm (1.893 to 1.896 in.)
    
    Minimum cam lobe height
    
    47.92 mm (1.887 in.)
    
    If the cam lobe height is less than the minimum, replace the exhaust camshaft sub-assembly.
3. Inspect the diameter of the camshaft journal.
  1. Using a micrometer, measure the diameter of the No. 2 camshaft journal for the camshaft bearing.
    
    Standard diameter
    
    27.969 to 27.985 mm (1.101 to 1.102 in.)
    
    If the diameter is not as specified, check the camshaft oil clearance.

Standard idle gear inside diameter
44.000 to 44.025 mm (1.732 to 1.734 in.)

Standard idle gear shaft diameter
43.955 to 43.990 mm (1.730 to 1.732 in.)

Standard oil clearance
0.01 to 0.07 mm (0.000394 to 0.00276 in.)

Maximum oil clearance
0.20 mm (0.00787 in.)

Maximum warpage
0.4 mm (0.0157 in.)

Maximum warpage
0.4 mm (0.0157 in.)

Maximum circle runout
0.03 mm (0.00118 in.)

Standard cam lobe height
47.18 to 47.28 mm (1.857 to 1.861 in.)

Minimum cam lobe height
46.76 mm (1.841 in.)

Standard diameter
27.969 to 27.985 mm (1.101 to 1.102 in.)

Standard backlash
0.035 to 0.089 mm (0.00138 to 0.00350 in.)

Maximum backlash
0.189 mm (0.00744 in.)

Maximum circle runout
0.03 mm (0.00118 in.)

Standard cam lobe height
48.07 to 48.17 mm (1.893 to 1.896 in.)

Minimum cam lobe height
47.92 mm (1.887 in.)

Standard diameter
27.969 to 27.985 mm (1.101 to 1.102 in.)

INSPECT CAMSHAFT OIL CLEARANCE

Clean the camshaft bearing caps and journals.
Check the camshaft bearings for flaking and scoring.

If the camshaft bearings are damaged, replace the cylinder head sub-assembly.
Place the camshaft on the cylinder head sub-assembly.

*A	Intake Side
*B	Exhaust Side
*a	Plastigage

Lay a strip of Plastigage across each of the journals.

Install the camshaft bearing caps.

Note

Do not turn the camshaft.
Remove the camshaft bearing caps.

*A	Intake Side
*B	Exhaust Side
*a	Plastigage

Measure the Plastigage at its widest point.

Standard oil clearance
0.025 to 0.062 mm (0.000984 to 0.00244 in.)

Maximum oil clearance
0.1 mm (0.00394 in.)

If the oil clearance is more than the maximum, replace the camshaft sub-assembly. If necessary, replace the cylinder head sub-assembly.

Completely remove the Plastigage.
Remove the camshaft sub-assembly.

INSPECT CAMSHAFT THRUST CLEARANCE
1. Install the camshaft sub-assembly.
2. *A Intake Side
  
  *B Exhaust Side
  
  Using a dial indicator, measure the thrust clearance while moving the camshaft sub-assembly back and forth.
  
  Standard thrust clearance
  
  0.035 to 0.185 mm (0.00138 to 0.0728 in.)
  
  Maximum thrust clearance
  
  0.25 mm (0.00984 in.)
  
  If the thrust clearance is more than the maximum, replace the camshaft sub-assembly. If necessary, replace the cylinder head sub-assembly.
3. Remove the camshaft sub-assembly.
INSPECT CYLINDER HEAD SET BOLT
1. *a Measurement Area
  
  Using a vernier caliper, measure the diameter of the most elongated threads in the measurement area.
  
  Standard outside diameter
  
  11.76 to 11.97 mm (0.463 to 0.471 in.)
  
  Minimum outside diameter
  
  11.6 mm (0.457 in.)
  
  Tech Tips
  
  If a visual check reveals no excessively thin areas, check the center of the cylinder head set bolt (see illustration) and find the area that has the smallest diameter.
  
  If the diameter is less than the minimum, replace the cylinder head set bolt.