Part 2

CYLINDER HEAD INSPECTION Continued

Intake Of RH Bank:

10. INSPECT CAMSHAFT
a. Inspect the circle runout.
(1) Place the camshaft on V-blocks.
(2) Using a dial indicator, measure the circle runout at the center journal.
Maximum circle runout: 0.08 mm (0.0031 inch)
If the circle runout is greater than the maximum, replace the camshaft.

Intake Of RH Bank:

b. Using a micrometer, measure the cam lobe height.
Standard cam lobe height: 42.610 to 42.710 mm (1.6776 to 1.6815 inch)
Minimum cam lobe height: 42.46 mm (1.6717 inch)
If the cam lobe height is less than the minimum, replace the camshaft.

Intake Of RH Bank:

c. Inspect the journal diameter of the camshaft.
(1) Using a micrometer, measure the journal diameter of the camshaft for the camshaft bearing.
Journal diameter: 26.954 to 26.970 mm (1.0612 to 1.0618 inch)
If the journal diameter is not as specified, check the oil clearance.

Intake Of RH Bank:

(2) Using a micrometer, measure the journal diameter for the camshaft timing tube.
Journal diameter: 30.984 to 31.000 mm (1.2198 to 1.2205 inch)
If the journal diameter is not as specified, check the oil clearance.

Intake Of RH Bank:

d. Inspect the journal diameter of the camshaft timing tube.
(1) Using a micrometer, measure the journal diameter.
Journal diameter: 39.955 to 39.964 mm (1.5730 to 1.5734 inch)
If the journal diameter is not as specified, check the oil clearance.

Intake Of RH Bank:

e. Install the camshaft timing tube to the camshaft, and check that the timing tube turns smoothly.
If necessary, replace the timing tube and camshaft.

Intake Of RH Bank:

f. Check the oil clearance.
(1) Install the camshaft timing tube to the camshaft.
(2) Clean the bearing caps and journals.
(3) Check that bearings for flaking and scoring. If the bearings are damaged, replace the bearing caps and cylinder head as a set.
(4) Place the camshaft on the cylinder head.
(5) Lay a strip of Plastigage across each of the journals.
(6) Install the bearing caps.

NOTICE: Do not turn the camshaft.

(7) Remove the bearing caps.

Intake Of RH Bank:

(8) Measure the Plastigage at its widest point.

Standard Oil Clearance:

Maximum Oil Clearance:

If the oil clearance is greater than the maximum, replace the camshaft and timing tube. If necessary, replace the bearing caps and cylinder head as a set.
(9) Completely remove the Plastigage.
(10) Remove the camshaft.
(11) Remove the camshaft timing tube from the camshaft.

Intake Of RH Bank:

g. Check the thrust clearance.
(1) Install the camshaft timing tube to the camshaft.
(2) Install the camshaft.
(3) Using a dial indicator, measure the thrust clearance while moving the camshaft back and forth.
Standard thrust clearance: 0.060 to 0.100 mm (0.0024 to 0.0039 inch)
Maximum thrust clearance: 0.13 mm (0.0051 inch)
If the thrust clearance is greater than the maximum, replace the camshaft. If necessary, replace the bearing caps and cylinder head as a set.
(4) Remove the camshaft.
(5) Remove the camshaft timing tube from the camshaft.

Intake Of RH Bank:

h. Check the gear backlash.
(1) Install the drive gear to the camshaft timing tube.
(2) Install the camshaft timing tube to the camshaft.
(3) Install the camshaft and No.2 camshaft without installing the camshaft sub-gear and front bearing cap.
(4) Using a dial indicator, measure the backlash.
Standard backlash: 0.020 to 0.200 mm (0.0008 to 0.0079 inch)
Maximum backlash: 0.30 mm (0.0118 inch)
If the backlash is greater than the maximum, replace the drive gear and No.2 camshaft.
i. Remove the camshaft and No.2 camshaft.
j. Remove the camshaft timing tube from the camshaft.
k. Remove the drive gear from the camshaft timing tube.

Exhaust Of RH Bank:

11. INSPECT NO.2 CAMSHAFT
a. Inspect the circle runout.
(1) Place the camshaft on V-blocks.
(2) Using a dial indicator, measure the circle runout at the center journal.
Maximum circle runout: 0.08 mm (0.0031 inch)
If the circle runout is greater than the maximum, replace the No.2 camshaft.

Exhaust Of RH Bank:

b. Using a micrometer, measure the cam lobe height.
Standard cam lobe height: 42.630 to 42.730 mm (1.6783 to 1.6823 inch)
Minimum cam lobe height: 42.48 mm (1.6724 inch)
If the cam lobe height is less than the minimum, replace the No.2 camshaft.

Exhaust Of RH Bank:

c. Using a micrometer, measure the journal diameter.
Journal diameter: 26.954 to 26.970 mm (1.0612 to 1.0618 inch)
If the journal diameter is not as specified, check the oil clearance.

Exhaust Of RH Bank:

d. Check the oil clearance.
(1) Clean the bearing caps and journals.
(2) Check that bearings for flaking and scoring. If the bearings are damaged, replace the bearing caps and cylinder head as a set.
(3) Place the No.2 camshaft on the cylinder head.
(4) Lay a strip of Plastigage across each of the journals.
(5) Install the bearing caps.

NOTICE: Be careful not to turn the No.2 camshaft.

(6) Remove the bearing caps.

Exhaust Of RH Bank:

(7) Measure the Plastigage at its widest point.
Standard oil clearance: 0.030 to 0.067 mm (0.0012 to 0.0026 inch)
Maximum oil clearance: 0.100 mm (0.0039 inch)
If the oil clearance is greater than the maximum, replace the No.2 camshaft. If necessary, replace the bearing caps and cylinder head as a set.
(8) Completely remove the Plastigage.
(9) Remove the No.2 camshaft.

Exhaust Of RH Bank:

e. Check the thrust clearance.
(1) Install the camshaft.
(2) Using a dial indicator, measure the thrust clearance while moving the camshaft back and forth.
Standard thrust clearance: 0.030 to 0.075 mm (0.0012 to 0.0030 inch)
Maximum thrust clearance: 0.12 mm (0.0047 inch)
If the thrust clearance is greater than the maximum, replace the No.2 camshaft. If necessary, replace the bearing caps and cylinder head as a set.
(3) Remove the No.2 camshaft.

Intake Of LH Bank:

12. INSPECT NO.3 CAMSHAFT SUB-ASSEMBLY
a. Inspect the circle runout.
(1) Place the camshaft on V-blocks.
(2) Using a dial indicator, measure the circle runout at the center journal.
Maximum circle runout: 0.08 mm (0.0031 inch)
If the circle runout is greater than the maximum, replace the No.3 camshaft.

Intake Of LH Bank:

c. Inspect the journal diameter of the camshaft.
(1) Using a micrometer, measure the journal diameter of the No.3 camshaft for the camshaft bearing.
Journal diameter: 26.954 to 26.970 mm (1.0612 to 1.0618 inch)
If the journal diameter is not as specified, check the oil clearance.

Intake Of LH Bank:

e. Install the timing tube to the No.3 camshaft, and check the timing tube turns smoothly.
If necessary, replace the timing tube and No.3 camshaft.

Intake Of LH Bank:

f. Check the oil clearance.
(1) Install the camshaft timing tube to the No.3 camshaft.
(2) Clean the bearing caps and journals.
(3) Check that bearings for flaking and scoring. If the bearings are damaged, replace the bearing caps and cylinder head as a set.
(4) Place the No.3 camshaft on the cylinder head.
(5) Lay a strip of Plastigage across each of the journals.
(6) Install the bearing caps.

NOTICE: Be careful not to turn the camshaft.

(7) Remove the bearing caps.

Intake Of LH Bank:

(8) Measure the Plastigage at its widest point.

Standard Oil Clearance:

Maximum Oil Clearance:

If the oil clearance is greater than the maximum, replace the No.3 camshaft and timing tube. If necessary, replace the bearing caps and cylinder head as a set.
(9) Completely remove the Plastigage.
(10) Remove the camshaft.
(11) Remove the camshaft timing tube from the No.3 camshaft.

Intake Of LH Bank:

g. Check the thrust clearance.
(1) Install the camshaft timing tube to the No.3 camshaft.
(2) Install the No.3 camshaft.
(3) Using a dial indicator, measure the thrust clearance while moving the No.3 camshaft back and forth.
Standard thrust clearance: 0.060 to 0.100 mm (0.0024 to 0.0039 inch)
Maximum thrust clearance: 0.13 mm (0.0051 inch)
If the thrust clearance is greater than the maximum, replace the No.3 camshaft. If necessary, replace the bearing caps and cylinder head as a set.
(4) Remove the No.3 camshaft.
(5) Remove the camshaft timing tube from the No.3 camshaft.

Intake Of LH Bank:

h. Check the gear backlash.
(1) Install the drive gear to the camshaft timing tube.
(2) Install the camshaft timing tube to the No.3 camshaft.
(3) Install the No.3 camshaft and No.4 camshaft without installing the camshaft sub-gear and front bearing cap.
(4) Using a dial indicator, measure the backlash.
Standard backlash: 0.020 to 0.200 mm (0.0008 to 0.0079 inch)
Maximum backlash: 0.30 mm (0.0188 inch)
If the backlash is greater than the maximum, replace the drive gear and No.4 camshaft.
i. Remove the No.3 camshaft and No.4 camshaft.
j. Remove the camshaft timing tube from the No.3 camshaft.
k. Remove the drive gear from the camshaft timing tube.

Exhaust Of LH Bank:

13. INSPECT NO.4 CAMSHAFT SUB-ASSEMBLY
a. Inspect the circle runout.
(1) Place the camshaft on V-blocks.
(2) Using a dial indicator, measure the circle runout at the center journal.
Maximum circle runout: 0.08 mm (0.0031 inch)
If the circle runout is greater than the maximum, replace the No.4 camshaft.

Exhaust Of LH Bank:

c. Using a micrometer, measure the journal diameter.
Journal diameter: 26.954 to 26.970 mm (1.0612 to 1.0618 inch)
If the journal diameter is not as specified, check the oil clearance.

Exhaust Of LH Bank:

d. Check the oil clearance.
(1) Clean the bearing caps and journals.
(2) Check that bearings for flaking and scoring. If the bearings are damaged, replace the bearing caps and cylinder head as a set.
(3) Place the No.4 camshaft on the cylinder head.
(4) Lay a strip of Plastigage across each of the journals.
(5) Install the bearing caps.

NOTICE: Be careful not to turn the No.4 camshaft.

(6) Remove the bearing caps.

Exhaust Of LH Bank:

(7) Measure the Plastigage at its widest point.
Standard oil clearance: 0.030 to 0.067 mm (0.0012 to 0.0026 inch)
Maximum oil clearance: 0.100 mm (0.0039 inch)
If the oil clearance is greater than the maximum, replace the No.4 camshaft. If necessary, replace the bearing caps and cylinder head as a set.
(8) Completely remove the Plastigage.
(9) Remove the No.4 camshaft.

Exhaust Of LH Bank:

e. Check the thrust clearance.
(1) Install the camshaft.
(2) Using a dial indicator, measure the thrust clearance while moving the No.4 camshaft back and forth.
Standard oil clearance: 0.030 to 0.075 mm (0.0012 to 0.0030 inch)
Maximum oil clearance: 0.12 mm (0.0047 inch)
If the thrust clearance is greater than the maximum, replace the No.4 camshaft. If necessary, replace the bearing caps and cylinder head as a set.
(3) Remove the No.4 camshaft.

14. INSPECT CYLINDER HEAD SET BOLT
a. Using a vernier caliper, measure the thread outside diameter of the bolt.
Standard outside diameter: 9.770 to 9.960 mm (0.3846 to 0.3921 inch)
Minimum outside diameter: 9.70 mm (0.3819 inch)
If the diameter is less than the minimum, replace the bolt.