Camshaft
Camshaft
REMOVAL
NOTE: Perform the work with the engine installed to body when replacing a single part. Refer to "Valve Clearance" for preparation.
1) Remove the V-belts.
2) Remove the crank pulley.
3) Remove the front chain cover.
4) Remove the timing chain assembly.
5) Remove the cam sprocket.
6) Remove the crank sprocket.
7) Remove the rear chain cover.
8) Disconnect the oil pipe.
9) Remove the rocker cover (LH).
10) Remove the plugs (LH).
11) Loosen the camshaft cap bolts equally, a little at a time in alphabetical sequence shown in the figure.
12) Remove the camshaft caps and camshaft (LH).
NOTE: Arrange camshaft caps in order so that they can be installed in their original positions.
13) 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.
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 cam journal, resulting in engine seizure.
NOTE: Install within 5 min. after applying liquid gasket.
2) Apply engine oil to cap bearing surface, and install the cap to camshaft.
3) Tighten the cam bearing bolts in the numerical order as shown in the figure.
3) Install the plugs.
4) 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 cam journal, resulting in engine seizure.
NOTE: Install within 5 min. after applying liquid gasket.
3) Tighten the rocker cover bolts in the numerical order as shown in the figure.
5) Connect the oil pipe.
NOTE:
^ Be careful not to mistake the location of (A) and (B).
^ Use anew 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.
12) Install the V-belts.
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 journals.
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.
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
HIGH 42.09 - 42.19 mm (1. 6571 - 1.6610 in)
LOW1 38.14 - 38.24 mm (1.5016 - 1.5055 in)
LOW2 38.14 - 38.24 mm (1.5016 - 1.5055 in)
Exhaust 40.45 - 40.55 mm (1.5925 - 1.5965 in)
Cam base circle diameter A:
Intake
HIGH 32.0 mm (1.2598 in)
LOW1 31.84 mm (1.2535 in)
LOW2 31.84 mm (1.2535 in)
Exhaust 32.0 mm (1.2598 in)
7) Measure the side clearance of the camshaft with a dial gauge. If the side clearance exceeds the standard or there is offset wear, 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: 0.030 - 0.090 mm (0.0012 - 0.0035 in)