Camshaft
Camshaft
REMOVAL
1) Remove the engine unit 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 bolt in the numerical order as shown in the figure, and then remove the rocker cover.
^ LH side
^ RH side
10) Loosen the camshaft cap bolts equally, a little at a time in numerical sequence 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 front camshaft cap as shown in the figure.
CAUTION: Do not apply liquid gasket excessively. Applying excessively may cause excess gasket to flow toward camshaft journal, resulting in engine seizure.
NOTE: Install within 5 min. after applying liquid gasket.
Liquid gasket. THREE BOND 1217G (Part No. K0877Y0100) or equivalent
Applying liquid gasket diameter. 2.0 ± 0.5 mm (0.079 ± 0.020 in)
(2) Apply engine oil to cap bearing surface, and install the cap to camshaft.
(3) Tighten the camshaft cap bolts in the numerical order as shown in the figure.
Tightening torque:
(1) - (12): 16 N-m (1.6 kgf-m, 12 ft-lb)
(13) - (16): 9.75 N-m (1.0 kgf-m, 7.2 ft-lb)
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.
CAUTION: Do not apply liquid gasket excessively. Applying excessively may cause excess gasket to flow toward camshaft journal, resulting in engine seizure.
NOTE: Install within 5 min. after applying liquid gasket.
Liquid gasket. THREE BOND 1217G (Part No. K0877Y0100) or equivalent
Applying liquid gasket 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 N-m (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 unit to vehicle.
INSPECTION
1) Measure the bend of camshaft. Repair or replace if bent.
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) Measure the outside diameter of camshaft journal. If the journal diameter is not within specification, check the oil clearance.
5) Measurement of the camshaft journal oil clearance:
(1) Clean the bearing caps and camshaft journals.
(2) Place the camshafts on cylinder head. (Without installing the valve rocker.)
(3) Place a plastigauge across each camshaft journal.
(4) Install the bearing cap.
NOTE: Do not turn the camshaft.
(5) Remove the bearing caps.
(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.
Standard. 0.037 - 0.072 mm (0.0015 - 0.0028 in)
(7) Completely remove the plastigauge.
6) Check the cam face condition; remove the minor faults by grinding with oil stone. Measure the cam height H. If it exceeds the standard or offset wear occurs, replace it.
Cam 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:
Intake: 36.0 mm (1.4173 in)
Exhaust: 36.0 mm (1.4173 in)
7) Measure the thrust clearance of camshaft with dial gauge. If the clearance exceeds the standard or offset wear occurs, replace the caps and cylinder head as a set. If necessary, replace the camshaft.
Standard.
Intake 0.075 - 0.135 mm (0.0030 - 0.0053 in)
Exhaust 0.075 - 0.135 mm (0.0030 - 0.0053 in)