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.
Hold the portion (A) of the camshaft with a hexagonal wrench, and 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 to be able to reassemble in the original position and direction.
Remove the camshaft (A).
Inspect the cam lobes.
Using a micrometer, measure the cam lobe height.
Cam height
LH camshaft
Intake : 35.452 ~ 35.652mm (1.3957 ~ 1.4306in)
Exhaust : 35.700 ~ 35.900mm (1.4055 ~ 1.4134in)
RH camshaft
Intake : 35.537 ~ 35.737mm (1.3991 ~ 1.4070in)
Exhaust : 35.452 ~ 35.652mm (1.3957 ~ 1.4036in)
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 of the camshaft journal.
Install the bearing caps and tighten the bolts with specified torque.
Tightening torque :
12.7 ~ 14.7N.m (1.3 ~ 1.5kgf.m, 9.4 ~ 10.8lb-ft)
Do not turn the camshaft.
Remove the bearing caps.
Measure the plastigage at its widest point.
Bearing oil clearance
0.040 ~ 0.077mm (0.0016 ~ 0.0030in)
If the oil clearance is greater than specificaiton, 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 ~ 0.2mm (0.0039 ~ 0.0079in)
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 camshaft (A).
Install the camshaft bearing caps (A).
Tightening torque :
12.7 ~ 14.7N.m (1.3 ~ 1.5kgf.m, 9.4 ~ 10.8lb-ft)
Install the camshaft sprocket and tighten the bolt to the specified torque.
Temporarily install the camshaft sprocket bolt (C).
Hold the portion (A) of the camshaft with a hexagonal wrench, and tighten the bolt (C) with a wrench (B).
Tightening torque :
68.6 ~ 73.5N.m (7.0 ~ 7.5kgf.m, 50.6 ~ 54.2lb-ft)
Install the vacuum pump (A) with new gasket (B).
Tightening torque :
10.8 ~ 14.7N.m (1.1 ~ 1.5kgf.m, 8.0 ~ 10.8lb-ft)
Apply engine oil to the O-ring(A) of vacuum pump shaft before assembling vacuum pump.
Install the timing chain.
(Refer to Timing System – “Timing Chain”)
Install the cylinder head cover.
(Refer to Cylinder Head Assembly – “Cylinder Head Cover”)
