Camshaft
CamshaftCYLINDER HEAD AND CAMSHAFT (PART 1):
CYLINDER HEAD AND CAMSHAFT (PART 2):
REMOVAL
NOTE: Perform the work with the engine installed to body when replacing a single part.
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.
Liquid gasket:
THREE BOND 1280B (Part No. K0877YA018)
Applying liquid gasket diameter:
2.0 ± 0.5 mm (0.079 ± 0.020 inch)
(2) Apply engine oil to cap bearing surface, and install the cap to camshaft.
(3) Tighten the rocker cover bolts in the numerical order as shown in the figure.
Tightening torque:
(1) - (12): 16 N-m (1.6 kgf-m, 12 ft. lbs.)
(13) - (16): 9.75 N-m (1.0 kgf-m, 7.2 ft. lbs.)
Tightening torque:
3) Install the plugs.
Tightening torque:
60 N-m (6.1 kgf-m, 44 ft. lbs.)
Tightening torque:
4) Install the rocker cover.
(1) 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.
Liquid gasket:
THREE BOND 1280B (Part No. K0877YA018)
(2) Tighten the rocker cover bolts in the numerical order as shown in the figure.
Tightening torque:
6.4 N-m (0.65 kgf-m, 4.7 ft. lbs.)
5) Connect the oil pipe.
NOTE:
^ Be careful not to mistake the location of (A) and (B).
^ Use a new gasket.
Tightening torque:
(A), (B) 29 N-m (3.0 kgf-m, 21.4 ft. lbs.)
(C) 6.4 N-m (0.65 kgf-m, 4.7 ft. lbs.)
Tightening torque:
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 cove.
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 Plastigage(R) 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 Plastigage(R) 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 inch)
Standard:
(7) Completely remove the Plastigage(R).
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 inch)
LOW1 38.14 - 38.24 mm (1.5016 -1.5055 inch)
LOW2 34.94 - 35.04 mm (1.3756 -1.3795 inch)
Exhaust
41.65 - 41.75 mm (1.6398 - 1.6437 inch)
Cam base circle diameter A:
Intake
HIGH 32.0 mm (1.2598 inch)
LOW1 31.84 mm (1.2535 inch)
LOW2 31.84 mm (1.2535 inch)
Exhaust
32.0 mm (1.2598 inch)
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 inch)
Exhaust 0.030 - 0.090 mm (0.0012 - 0.0035 inch)