Remove the cylinder head cover.
(Refer to Cylinder Head Assembly - “Cylinder Head Cover”)
Remove the timing chain.
(Refer to Timing System - “Timing Chain”)
Remove the camshaft sprocket.
While holding the portion (A) of the camshaft with a hexagonal wrench, remove the bolt (C) with a wrench (B) and remove the camshaft sprocket.
Be careful not to damage the cylinder head and valve lifter with the wrench.
Remove the vacuum pump (A).
Do not disassemble the vacuum pump.
Remove the camshaft bearing caps (A).
Mark the camshaft bearing caps for reassembly in the original position and direction.
Remove the LH camshaft (A) and the RH camshaft (B).
Inspect the cam lobes.
Using a micrometer, measure the cam lobe height.
Cam height
LH camshaft
Intake : 35.321 ~ 35.521mm (1.3906 ~ 1.3985 in)
Exhaust : 35.673 ~ 35.873 mm (1.4045 ~ 1.4123 in)
RH camshaft
Intake : 35.537 ~ 35.737 mm (1.3991 ~ 1.4070 in)
Exhaust : 35.452 ~ 35.652 mm (1.3957 ~ 1.4036 in)
If the cam lobe height is less than specification, replace the camshaft.
Inspect the camshaft journal clearance.
Clean the bearing caps and camshaft journals.
Place the camshafts on the cylinder head.
Lay a strip of plastigage across each camshaft journal.
Install the bearing caps and tighten the bolts to specified torque.
Tightening torque :
12.7 ~ 14.7 N.m (1.3 ~ 1.5 kgf.m, 9.4 ~ 10.8 lb-ft)
Do not turn the camshaft.
Remove the bearing caps.
Measure the plastigage at its widest point.
Bearing oil clearance :
0.040 ~ 0.077 mm (0.0016 ~ 0.0030 in)
If the oil clearance is greater than specification, replace the camshaft. If necessary, replace the bearing caps and cylinder head as a set.
Completely remove the plastigage.
Remove the camshafts.
Inspect the camshaft end play.
Install the camshafts.
Using a dial indicator, measure the end play while moving the camshaft back and forth.
Camshaft end play
Standard : 0.1 ~ 0.2 mm (0.0039 ~ 0.0079 in)
If the end play is greater than specification, replace the camshaft. If necessary, replace the bearing caps and cylinder head as a set.
Remove the camshafts.
Install the LH camshaft (A) and the RH camshaft (B).
Install the camshaft bearing caps (A).
Tightening torque :
12.7 ~ 14.7 N.m (1.3 ~ 1.5 kgf.m, 9.4 ~ 10.8 lb-ft)
Install the camshaft sprocket and tighten the bolt to the specified torque.
Temporarily install the camshaft sprocket bolt.
While holding the portion of the camshaft with a hexagonal wrench (A), tighten the bolt with a wrench (B).
Tightening torque :
68.6 ~ 73.5 N.m (7.0 ~ 7.5 kgf.m, 50.6 ~ 54.2 lb-ft)
Install the vacuum pump (A) with new gasket (B).
Tightening torque :
10.8 ~ 14.7 N.m (1.1 ~ 1.5 kgf.m, 8.0 ~ 10.8 lb-ft)
Apply engine oil to the O-ring (A) of vacuum pump shaft before assembling vacuum pump.
Install the remaining parts in the reverse order of removal.
