Camshaft
REMOVAL
1) Remove the engine from vehicle.
2) Remove the crank pulley.
3) Remove the chain cover.
4) Remove the timing chain assembly.
5) Remove the cam sprocket.
6) Remove the crank sprocket.
7) Remove the exhaust oil flow control solenoid valve.
8) Remove the camshaft position sensor.
9) Loosen the rocker cover bolts in the order indicated in the figure, and remove the rocker cover.
^ LH side
^ RH side
10) Loosen the camshaft cap bolts equally, a little at a time in numerical sequence as shown in the figure.
11) Remove the camshaft caps and camshaft (RH).
NOTE:
Arrange camshaft caps in order so that they can be installed in their original positions.
12) Similarly, remove the camshafts (LH) and related parts.
INSTALLATION
1) Apply engine oil to camshaft journals, and install the camshaft.
2) Install the camshaft cap.
(1) Apply liquid gasket sparingly to back side of the front camshaft cap as shown in the figure.
NOTE:
^ Install within 5 min. after applying liquid gasket.
^ Do not apply liquid gasket excessively. Applying excessively may cause excess gasket to come out and flow toward cam journal, resulting in engine seizure.
Liquid gasket:
THREE BOND 1217G (Part No. K0877Y0100) or equivalent
Liquid gasket applying diameter:
2.0±0.5 mm (0.079±0.020 in)
(2) Install the O-ring to the front camshaft cap.
NOTE:
Use new O-rings.
(3) Apply a thin coat of engine oil to the cap journal surface, and install the camshaft cap to the camshaft.
(4) Gradually tighten the camshaft cap in at least two stages in the numerical order shown in the figure, then tighten to specified torque.
Tightening torque:
(1) - (12): 16 Nm (1.6 kgf-m, 11.8 ft-lb)
(13) - (17): 9.75 Nm (1.0 kgf-m, 7.2 ft-lb)
(5) After tightening the camshaft cap, ensure the camshaft rotates only slightly while holding it at base circle.
3) Install the rocker cover.
(1) Install the rocker cover gasket to the rocker cover.
NOTE:
Use a new rocker cover gasket.
(2) Apply liquid gasket sparingly to the mating surface of cylinder head and rocker cover as shown in the figure.
NOTE:
^ Install within 5 min. after applying liquid gasket.
^ Do not apply liquid gasket excessively. Applying excessively may cause excess gasket to come out and flow toward cam journal, resulting in engine seizure.
Liquid gasket:
THREE BOND 1217G (Part No. K0877Y0100) or equivalent
Liquid gasket applying diameter:
3.5±0.5 mm (0.138±0.020 in)
^ LH side
^ RH side
(3) Tighten the rocker cover bolts in the numerical order as shown in the figure.
Tightening torque:
6.4 Nm (0.7 kgf-m, 4.7 ft-lb)
^ LH side
^ RH side
4) Install the crank sprocket.
5) Install the cam sprocket.
6) Install the timing chain assembly.
7) Install the chain cover.
8) Install the crank pulley.
9) Install the engine to the vehicle.
INSPECTION
1) Measure the bend, and repair or replace if necessary.
Camshaft bend limit:
0.020 mm (0.00079 in)
2) Check the journal for damage and wear. Replace if faulty.
3) Check the cutout portion used for camshaft sensor for damage. Replace if faulty.
4) Check the cam face condition; remove the minor faults by grinding with oil stone. Replace if there is uneven wear or others.
5) Measure the cam lobe height "H" and cam base circle diameter "A". If it exceeds the standard or offset wear occurs, replace it.
Cam lobe height H:
Standard
Intake
45.90 - 46.00 mm (1.8071 - 1.8110 in)
Exhaust
44.65 - 44.75 mm (1.7579 - 1.7618 in)
Cam base circle diameter A:
Standard
Intake
36.00 mm (1.4173 in)
Exhaust
36.00 mm (1.4137 in)
6) Measure the outside diameter of camshaft journal. If the journal diameter is not within specification, check the oil clearance.
7) Measure the oil clearance of camshaft journal.
(1) Clean the camshaft cap and cylinder head camshaft journal.
(2) Place the camshaft on cylinder head. (Without installing the valve lifter)
(3) Place a plastigauge across each camshaft journals.
(4) Gradually tighten the camshaft cap in at least two stages in the numerical order shown in the figure, then tighten to specified torque. Do not turn the camshaft.
Tightening torque:
(1) - (12): 16 Nm (1.6 kgf-m, 11.8 ft-lb)
(13) - (17): 9.75 Nm (1.0 kgf-m, 7.2 ft-lb)
(5) Remove the camshaft cap.
(6) Measure the widest point of the plastigauge on each journal. If oil clearance exceeds the standard, replace the camshaft. If necessary, replace the camshaft caps and cylinder head as a set.
Camshaft oil clearance:
Standard
0.037 - 0.072 mm (0.0015 - 0.0028 in)
(7) Completely remove the plastigauge.
8) Measure the thrust clearance with setting the dial gauge at end surface of camshaft. If the thrust clearance is not within the standard or there is offset wear, replace the camshaft caps and cylinder head as a set. If necessary replace the camshaft.
Camshaft thrust clearance:
Standard
Intake
0.075 - 0.135 mm (0.0030 - 0.0053 in)
Exhaust
0.075 - 0.135 mm (0.0030 - 0.0053 in)