Camshaft
CAMSHAFT
COMPONENTS
DISASSEMBLY
1. Disconnect the negative terminal from the battery.
2. Drain the engine coolant.
3. Remove the breather hose between the air cleaner and the rocker cover.
4. Remove the air cleaner.
5. Remove the timing belt cover.
6. Remove the rocker cover and crank shaft position sensor.
7. Loosen the camshaft sprocket bolts then remove the camshaft sprockets.
8. Loosen the camshaft bearing cap bolts and remove the bearing caps, camshafts, rocker arms and lash adjusters.
CAUTION: Loosen the cap bolts in increments to avoid bending the camshafts.
INSPECTION
ROCKER ARMS
1. Check rotation of the roller. If they do not rotate smoothly or are loose, replace them.
2. Check the roller surface. Replace if there is any dent, damage or evidence to seizure.
3. Check the valve contact surface for possible damage or evidence of seizure. Replace if necessary.
CAMSHAFTS
1. Check the camshaft journals for wear. If the journals are badly worn, replace the camshaft.
2. Check the cam lobes for damage. If the lobe is damaged or worn excessively, replace the camshaft.
Cam height
[Standard]
Intake: 35.493 mm (1.3974 inch)
Exhaust: 35.317 mm (1.3904)
[Limit]
Intake: 34.993 mm (1.3776 inch)
Exhaust: 34.817 mm (1.3707 inch)
REASSEMBLY
1. Install the camshafts on the cylinder head. Do not install the rocker arms yet.
NOTE:
1. Apply engine oil to journals and cams of the camshafts.
2. The exhaust camshaft has a slit on its rear end for the crankshaft position sensor.
2. Install the bearing caps. The markings on the caps are for intake exhaust identification.
I: Intake camshaft. E: Exhaust camshaft
3. Check that the camshaft can be easily turned by hand. After checking, remove the bearing caps and the camshafts, and then install the rocker arms.
4. Make sure that the dowel pins on the camshaft sprocket ends are located on the top.
5. Tighten the bearing caps to the specified torque in two or three increments as shown.
NOTE: Tighten the rocker arms uniformly.
Tightening torque
Bearing cap bolts: 19 - 21 Nm (190 - 210 kg-cm, 14 - 15 ft. lbs.)
6. Using the special tools, camshaft oil seal Installer and guide (09221-21000, 09221-21100). Be sure to apply engine oil to the external surface of the oil seal.
Insert the oil seal along the camshaft front end and install it by driving the installer with a hammer until the oil seal is fully seated.
7. Install the camshaft sprocket bolts to the specified torque.
Tightening torque
Camshaft sprocket bolts: 80 - 100 Nm (800 - 1000 kg-cm, 58 - 72 ft. lbs.)
8. Install the rocker cover. Apply sealant as shown.
Tightening torque
Rocker cover bolts: 8 - 10 Nm (80 - 100 kg-cm, 6 - 7 ft. lbs.)
Center cover bolts: 4 - 5 Nm (40 - 50 kg-cm, 3 - 4 ft. lbs.
Sealant
A Portion: Threebond No. 10 or equivalent
B Portion: Threebond No. 1212D or equivalent
Bolt
A: 13EA (Rocker cover bolts)
B: 4EA (Center cover bolts)
9. Install the spark plugs, and ignition coils. Connect the secondary wires and then install the center cover.
10. Install the dowel pin on the sprocket side of the intake cam shaft.
11. Install the cam position sensor support assembly after installing the cam position sensor cylinder on the exhaust camshaft.