Camshaft
REMOVAL1. Remove the crank pulley.
2. Remove the front chain cover.
3. Remove the timing chain assembly.
4. Remove the cam sprocket.
5. Remove the crank sprocket.
6. Remove the rear chain cover.
7. Disconnect the oil pipe.
8. Remove the rocker cover (LH).
9. Remove the plugs (LH).
10. Loosen the camshaft cap bolts equally, a little at a time in alphabetical sequence shown in the figure.
11. Remove the camshaft caps and camshaft (LH).
NOTE: Arrange camshaft caps in order so that they can be installed in their original positions.
12. Similarly, remove the camshafts (RH) and related parts.
INSTALLATION
1. Apply engine oil to camshaft journals, and install the camshaft.
2. Install the camshaft cap.
a Apply liquid gasket sparingly to back side of front camshaft cap as shown in the figure.
CAUTION: Do not apply fluid packing excessively. Failure to do so may cause excess gasket to come out and flow toward cam journal, resulting in engine burnt.
Liquid gasket: THREE BOND 1280B (Part No. K0877YA018)
b Apply engine oil to cap bearing surface, and install the cap to camshaft.
c Tighten the rocker cover bolts in the numerical order as shown in the figure.
4. Install the rocker cover.
a Apply liquid gasket sparingly to the mating surface of cylinder head and rocker cover as shown in the figure.
CAUTION: Do not apply fluid packing excessively. Failure to do so may cause excess gasket to come out and flow toward cam journal, resulting in engine burnt.
Liquid gasket: THREE BOND 1280B (Part No. K0877YA018)
^ LH side
^ RH side
b Tighten the rocker cover bolts in the numerical order as shown in the figure.
Tightening torque: 6.4 Nm (0.65 kgf-m, 4.7 ft. lbs.)
^ LH side
^ RH side
5. Connect the oil pipe.
CAUTION:
^ Be careful not to mistake the location of the (A) and (B).
^ Use a new gasket.
6. Install the rear chain cover.
7. Install the crank sprocket.
8. Install the cam sprocket.
9. Install the timing chain assembly.
10. Install the front chain cover.
11. Install the crank pulley.
INSPECTION
1. Check the camshaft for bend, and repair or replace if necessary.
2. Check the journal for damage and wear. Replace if faulty.
3. Measure the outside diameter of camshaft journal. If the journal diameter is not within specifications, check the oil clearance.
4. Measurement of the camshaft journal oil clearance:
a Clean the bearing caps and camshaft journals.
b Place the camshafts on the cylinder head. (Without installing the valve rocker.)
c Place a plastigauge across each of the camshaft journals.
d Install the bearing cap.
NOTE: Do not turn the camshaft.
e Remove the bearing caps.
f Measure the widest point of the plastigauge on each journal. If oil clearance exceeds the limit, replace the camshaft. If necessary, replace the camshaft caps and cylinder head as a set.
g Completely remove the plastigauge.
5. Check the cam face condition; remove the minor faults by grinding with oil stone. Measure the cam height H. If it exceeds the limit, replace it.
6. Measure the side clearance of camshaft with dial gauge. If the side clearance exceeds the limit or offset wearing is emitted, 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 inch)
Exhaust 0.030 - 0.090 mm (0.0012 - 0.0035 inch)