Camshaft

CAMSHAFT

REMOVAL 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 painted at the illustrated position.





4. Set the dowel pins of the camshaft at the illustrated positions.





5. Camshaft bearing caps Number 1 to Number 4 are of the same shape. Install them upon checking the identification mark so as not to misidentify cap Number and to confuse the intake side with the exhaust side.
Identification mark (stamped on front and Number 1 to Number 4 bearing caps)
I: Intake side
E: Exhaust side
6. Tighten each camshaft bearing cap mounting bolt to the specified tightening torque of 12 ± 1 Nm (107 ± 1 in-lb) in the order of number shown in the figure in two or three steps.





7. Tighten each front camshaft bearing cap mounting bolt to the temporarily torque of 17 ± 3 Nm (14 ± 2 ft-lb) in the order of number shown (1).
8. Tighten each front camshaft bearing cap mounting bolt to the specified tightening torque of 30 ± 2 Nm (22 ± 1 ft-lb) in the order of number shown (2).

[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: 43.25 mm (1.703 inches)
Exhaust: 45.00 mm (1.772 inches)
Limit:
Intake: 42.75 mm (1.683 inches)
Exhaust: 44.50 mm (1.752 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 - 0.032 mm (0 - 0.0013 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. Check the thickness stamp.





2. If the measured value in the table value is not in agreement with the value in the table to the thickness stamp, replace the valve tappet.
There are 47 kinds of valve tappets at intervals of 0.015 mm (0.0006 inch) in the range between 3.000 (0.1181 inch) and 3.690 mm (0.1453 inch).