Camshaft Bearing Torque and Sequence

INSTALL INTAKE CAMSHAFTS

NOTICE: Since the thrust clearance of the camshaft is small, the camshaft must be kept level while it is being installed. If the camshaft is not kept level, the portion of the cylinder head receiving the shaft thrust may crack or be damaged, causing the camshaft to seize or break. To avoid this, the following steps should be carried out.





a. Apply MP grease to the thrust portion of the camshaft.
b. Place the intake camshaft at 8 - 115° BTDC of camshaft angle on the cylinder head.

HINT: The above angle arrows the No. 1 and No. 3 cylinder cam lobes of the intake camshaft to push their valve lifters evenly.





c. Apply MP grease to a new oil seal lip.
d. Install the oil seal as far as the deepest part of the cylinder head.





e. Apply seal packing to the No. 1 bearing cap as shown.
Seal packing: Part No.0882-00080 or equivalent





f. Install the bearing caps in their proper locations.
g. Apply a light coat of engine oil on the threads and under the heads of the bearing cap bolts.





h. Install and uniformly tighten the 10 bearing cap bolts, in several passes, in the sequence shown.
Torque: 19 Nm (190 kgf-cm, 14 ft. lbs.)


INSTALL EXHAUST CAMSHAFT

NOTICE: Since the thrust clearance of the camshaft is small, the camshaft must be kept level while it is being installed. If the camshaft is not kept level, the portion of the cylinder head receiving the shaft thrust may crack or be damaged, causing the camshaft to seize or break. To avoid this, the following steps should be carried out.





a. Set the knock pin of the intake camshaft at 10 - 45° BTDC of camshaft angle.

HINT: The above angle allows the No. 2 and No. 4 cylinder cam lobes of the exhaust camshaft to push their valve lifters evenly.





b. Apply MP grease to the thrust portion of the camshaft.
c. Engage the exhaust camshaft gear to the intake camshaft gear by matching the timing marks on each gear.
d. Roll down the exhaust camshaft onto the bearing journals while engaging gears with each other.

NOTICE: There are also assembly reference marks on each gear as shown in the illustration. Do not use these marks.

e. Turn the intake camshaft clockwise or counterclockwise a little untie the exhaust camshaft sits in the bearing journals evenly without rocking the camshaft on the bearing journals.

NOTICE: It is very important to replace the camshaft in the bearing journals evenly while tightening bearing caps in the subsequent steps.





f. Install the bearing caps in their proper locations.
g. Apply a light coat of engine oil on the threads and under the heads of the bearing cap bolts.





h. Install and uniformly tighten the 10 bearing cap bolts, in several passes, in the sequence shown.
Torque: 19 Nm (190 kgf-cm, 14 ft. lbs.)
i. Remove the service bolt B.