ГОЛОВКА БЛОКА ЦИЛИНДРОВ ПРОВЕРКА

PROCEDURE

INSPECT CYLINDER HEAD SUB-ASSEMBLY

Using a precision straightedge and feeler gauge, measure the warpage of the surfaces that contact the cylinder block and manifolds.

*a	Cylinder Head Lower Side	*b	Intake Manifold Side
*c	Exhaust Manifold Side	-	-

Maximum warpage
0.05 mm (0.00197 in.)

If the warpage is more than the maximum, replace the cylinder head sub-assembly.

Using a dye penetrant, check the intake ports, exhaust ports and cylinder head surface for cracks.

If cracked, replace the cylinder head sub-assembly.

INSPECT INNER COMPRESSION SPRING
1. Using a vernier caliper, measure the free length of the inner compression spring.
  
  Standard free length
  
  52.13 mm (2.05 in.)
  
  If the free length is not as specified, replace the inner compression spring.
2. *a Deviation
  
  *b 35 mm (1.38 in.)
  
  Using a steel square, measure the deviation of the inner compression spring at the position shown in the illustration.
  
  Maximum deviation
  
  1.3 mm (0.0512 in.)
  
  Maximum angle
  
  2°
  
  If the deviation is more than the maximum, replace the inner compression spring.
INSPECT INTAKE VALVE
1. Using a vernier caliper, measure the overall length of the intake valve.
  
  Standard overall length
  
  106.56 to 106.96 mm (4.20 to 4.21 in.)
  
  Minimum overall length
  
  106.46 mm (4.19 in.)
  
  If the overall length is less than the minimum, replace the intake valve.
2. Using a micrometer, measure the diameter of the valve stem.
  
  Standard valve stem diameter
  
  5.470 to 5.485 mm (0.215 to 0.216 in.)
3. *a Margin Thickness
  
  Using a vernier caliper, measure the valve head margin thickness.
  
  Standard margin thickness
  
  0.8 to 1.2 mm (0.0315 to 0.0472 in.)
  
  Minimum margin thickness
  
  0.50 mm (0.0197 in.)
  
  If the margin thickness is less than the minimum, replace the intake valve.
INSPECT EXHAUST VALVE
1. Using a vernier caliper, measure the overall length of the exhaust valve.
  
  Standard overall length
  
  107.04 to 107.44 mm (4.214 to 4.230 in.)
  
  Minimum overall length
  
  106.94 mm (4.210 in.)
  
  If the overall length is less than the minimum, replace the exhaust valve.
2. Using a micrometer, measure the diameter of the valve stem.
  
  Standard valve stem diameter
  
  5.465 to 5.480 mm (0.215 to 0.216 in.)
3. *a Margin Thickness
  
  Using a vernier caliper, measure the valve head margin thickness.
  
  Standard margin thickness
  
  0.8 to 1.2 mm (0.0315 to 0.0472 in.)
  
  Minimum margin thickness
  
  0.50 mm (0.0197 in.)
  
  If the margin thickness is less than the minimum, replace the exhaust valve.
INSPECT VALVE SEAT
1. Apply a light coat of Prussian blue to the valve face.
2. Lightly press the valve face against the valve seat.
  
  Tech Tips
  
  Do not rotate the valve while pressing the valve against the valve seat.
3. *a Width
  
  Check the valve face and valve seat by using the following procedure.
  1. Check that Prussian blue appears around the entire valve face. If not, replace the valve.
  2. Check that Prussian blue appears around the entire valve seat. If so, the guide and valve face are concentric. If not, resurface the valve seat.
  3. Check that the valve seat contacts the middle of the valve face with the width between 1.1 to 1.5 mm (0.0433 to 0.0591 in.).
INSPECT CAMSHAFT THRUST CLEARANCE
1. Install the camshafts.
  
  Click here
2. Using a dial indicator, measure the thrust clearance while moving the camshaft back and forth.
  
  Standard thrust clearance
  
  0.060 to 0.155 mm (0.00236 to 0.00610 in.)
  
  Maximum thrust clearance
  
  0.175 mm (0.00689 in.)
  
  If the thrust clearance is more than the maximum, replace the cylinder head sub-assembly. If the thrust surface is damaged, replace the camshaft.

Standard free length
52.13 mm (2.05 in.)

Maximum deviation
1.3 mm (0.0512 in.)

Maximum angle
2°

Standard overall length
106.56 to 106.96 mm (4.20 to 4.21 in.)

Minimum overall length
106.46 mm (4.19 in.)

Standard valve stem diameter
5.470 to 5.485 mm (0.215 to 0.216 in.)

Standard margin thickness
0.8 to 1.2 mm (0.0315 to 0.0472 in.)

Minimum margin thickness
0.50 mm (0.0197 in.)

Standard overall length
107.04 to 107.44 mm (4.214 to 4.230 in.)

Minimum overall length
106.94 mm (4.210 in.)

Standard valve stem diameter
5.465 to 5.480 mm (0.215 to 0.216 in.)

Standard margin thickness
0.8 to 1.2 mm (0.0315 to 0.0472 in.)

Minimum margin thickness
0.50 mm (0.0197 in.)

Standard thrust clearance
0.060 to 0.155 mm (0.00236 to 0.00610 in.)

Maximum thrust clearance
0.175 mm (0.00689 in.)

INSPECT CAMSHAFT OIL CLEARANCE

Clean the camshaft bearing caps and camshaft journals.
Place the camshafts on the cylinder head sub-assembly.
*a Plastigage

Lay a strip of Plastigage across each of the camshaft journals.
Install the camshaft bearing caps.

Click here

Note

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

Click here

*a	Plastigage

Measure the Plastigage at its widest point.

Standard Oil Clearance

Item	Specified Condition
No. 1 journal	0.035 to 0.072 mm (0.00138 to 0.00283 in.)
Other journals	0.025 to 0.062 mm (0.000984 to 0.00244 in.)

Maximum oil clearance
0.08 mm (0.00315 in.)

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

Completely remove the Plastigage.

INSPECT VALVE GUIDE BUSH OIL CLEARANCE

Using a caliper gauge, measure the inside diameter of the valve guide bush.

Standard bush inside diameter

5.51 to 5.53 mm (0.217 to 0.218 in.)

Standard bush inside diameter
5.51 to 5.53 mm (0.217 to 0.218 in.)

Subtract the valve stem diameter measurement from the valve guide bush inside diameter measurement.

Standard Oil Clearance

Item	Specified Condition
Intake	0.025 to 0.060 mm (0.000984 to 0.00236 in.)
Exhaust	0.030 to 0.065 mm (0.00118 to 0.00256 in.)

Maximum Oil Clearance

Item	Specified Condition
Intake	0.08 mm (0.00315 in.)
Exhaust	0.10 mm (0.00397 in.)

If the clearance is more than the maximum, replace the valve and valve guide bush.

*a	Deviation
*b	35 mm (1.38 in.)