Camshaft
CAMSHAFTREMOVAL AND INSTALLATION
Removal Steps 1-13:
REMOVAL SERVICE POINTS
[A] FRONT CAMSHAFT BEARING CAP / OIL FEEDING CAMSHAFT BEARING CAP / CAMSHAFT BEARING CAP / THRUST CAMSHAFT BEARING CAP REMOVAL
CAUTION:
Loosing the camshaft bearing cap installation bolts in four to five steps. Do not loosen bolts in one step as this causes the valve spring force to push on the bolts and make them jump out causing damage to the threads.
First remove a mounting bolt of the front camshaft bearing cap and then a mounting bolt of each camshaft bearing cap in the order shown in the illustration.
[B] VALVE TAPPET REMOVAL
Pick out valve tappets with fingers and store removed valve tappets with tags describing the installed position attached for reassembly.
INSTALLATION SERVICE POINTS
[A] VALVE TAPPET INSTALLATION
Install valve tappets at the same position based on tags describing the installed position for reassembly.
[B] CAMSHAFT / BEARING / THRUST CAMSHAFT BEARING CAP / CAMSHAFT BEARING CAP / OIL FEEDING CAMSHAFT BEARING CAP / FRONT CAMSHAFT BEARING CAP INSTALLATION
1. When replacing a camshaft bearing, select a bearing with the size corresponding to the identification mark in the table below.
2. Install camshaft bearings on the cylinder head.
3. The identification mark of the camshaft bearing is stamped at the illustrated position.
4. Set the dowel pins of the camshaft at the illustrated positions.
5. Install them upon checking the identification mark so as not to misidentify cap No. and to confuse the intake side with the exhaust side.
Identification mark
I: Intake side
E: Exhaust side
6. Tighten each camshaft bearing cap mounting bolt to the specified torque in the order of number shown in the figure in two or three steps.
Specified torque: 12 ± 1 Nm (106 ± 8 in-lb)
7. Tighten each front camshaft bearing cap mounting bolt to the temporarily torque of 17 ± 3 Nm (14 ± 2 ft-lb) in the order shown (1).
8. Tighten each front camshaft bearing cap mounting bolt to the specified torque in the order shown (2).
Specified torque: 30 ± 2 Nm (22 ± 1 ft-lb)
[C] O-RING / ENGINE OIL CONTROL VALVE INSTALLATION
CAUTION:
^ The O-ring must not be reused.
^ Wind non-adhesive tape (seal tape, etc.) around the notch of the oil passage of the engine oil control valve before installing the O-ring to prevent damage. Damage to the O-ring causes oil leakage.
1. Apply a small amount of engine oil to the O-ring of the engine oil control valve.
2. Install the engine oil control valve on the cylinder head.
3. Tighten the engine oil control valve to the specified torque.
Specified torque: 10 ± 2 Nm (89 ± 17 in-lb)
INSPECTION
CAMSHAFT
Measure camshaft height (camshaft major axis). If the height is less than the limit, replace the camshaft.
Standard value:
Intake: 44.1 mm (1.74 inches)
Exhaust: 45.0 mm (1.77 inches)
Limit:
Intake: 43.6 mm (1.72 inches)
Exhaust: 44.5 mm (1.75 inches)
CAMSHAFT OIL CLEARANCE (PLASTIGAGE METHOD)
1. Thoroughly wipe oil on the outside diameter of the camshaft and the inside diameter of the bearing.
2. Install the bearing to the camshaft.
3. Put straightly the plastigage having the length of the bearing width on the journal axis, centering the axis.
4. Carefully install the bearing cap. Tighten the bolt as instructed in [B] Bolt Installation Point.
5. Remove the bolt and the bearing cap carefully.
6. Measure the plastigage whose width is most compressed using the scale printed on the plastigage bag. When the measured value deviates from the standard one, replace the bearing.
Standard value: 0.035 -0.072 mm (0.0014 -0.0028 inch)
CAUTION:
When the bearing is used again, be careful not to reverse the cylinder head side and the camshaft side during installation.
VALVE TAPPET
1. Measure the valve tappet at the illustrated position. If the measured value is not in agreement with the value in the table corresponding to the identification mark, replace the valve tappet.
2. The valve tappet has an identification mark and stamping of thickness at illustrated positions.
There are 47 kinds of valve tappets at intervals of 0.015 mm (0.0006 inch) in the range between 3.000 mm (0.1181 inch) and 3.690 mm (0.1453 inch).
