Camshaft Components
NOTE: This article has been updated by TSB 02-20-006
DISASSEMBLY
1. Disconnect the breather hose and the P.C.V. hose.
2. Remove the coolant pump. pulley and crankshaft pulley.
3. Remove the timing belt cover.
4. Loosen the timing belt tensioner pulley and temporary secure it.
5. Remove the timing belt from the camshaft sprocket.
6. Loosen the center cover bolts and then remove the center cover.
7. Remove the ignition coil assembly.
8. Loosen the cylinder head cover bolts and then remove the cylinder head cover.
9. Remove the camshaft sprocket.
10. Remove the camshaft bearing caps and timing chain.
11. Remove the camshaft.
12. Remove the mechanical tappets and shims.
NOTE: Arrange the mechanical tappets and shims in correct order
INSPECTION
CAMSHAFT
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 value]
Intake: 44.820 mm (1.7646 inch)
Exhaust: 44.720 mm (1.7606 inch)
[Limit]
Intake: 44.720 mm (1.7606 inch)
Exhaust: 44.620 mm (1.7567 inch)
3. Check the cam surface for abnormal wear or damage, and replace if necessary.
4. Check each bearing for damage. If the bearing surface is excessively damaged, replace the cylinder head assembly or camshaft bearing cap, as necessary.
Camshaft end play: 0.1 - 0.2 mm (0.004 - 0.008 inch)
CAMSHAFT OIL SEAL
1. Check the lips for wear. If the lip threads are worn, replace.
2. Check the oil seal lip contacting surface of the camshaft. If it is worn, replace the camshaft.
MLA (MECHANICAL LASH ADJUSTER)
VALVE CLEARANCE INSPECTION AND ADJUSTMENT
NOTE: Inspect and adjust the valve clearance when the engine is cold (Engine coolant temperature: 20°C) and cylinder head is installed on the cylinder block.
1. Remove the engine cover.
2. Remove oil filler cap.
3. Remove the center cover bolts and then remove the center cover.
4. Remove the upper timing belt cover
a. Loosen the upper timing belt cover bolts and then remove the cover.
5. Remove the cylinder head cover.
a. Disconnect the spark plug cables and do not pull on the spark plug cables by force.
NOTE: Pulling on or bending the cables may damage the conductor inside.
b. Disconnect the P.C.V. hose and the breather hose from the cylinder head cover.
c. Disconnect the accelerate cable from the cylinder head cover.
d. Loosen the cylinder head cover bolts and then remove the cover and gasket.
6. Set No.1 cylinder to TDC/ compression.
a. Turn the crankshaft pulley and align its groove with the timing mark "T" of the lower timing belt cover.
b. Check that the hole of the camshaft timing pulley is aligned with the timing mark of the bearing cap. If not, turn the crankshaft one revolution (360°)
7. Inspect the valve clearance.
a. Check only the valves indicated as shown. [No. 1 cylinder: TDC/Compression] measure the valve clearance
- Using a thickness gauge, measure the clearance between the tappet shim and the base circle of camshaft.
- Record the out-of-specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim.
Valve clearance (Engine coolant temperature: 20°C)
[Specification]
Intake: 0.20 mm (0.0079 inch)
Exhaust: 0.28 mm (0.0110 inch)
[Limit]
Intake: 0.12 - 0.28 mm (0.0047 - 0.0110 inch)
Exhaust: 0.20 - 0.36 mm (0.0079 - 0.0142 inch)
b. Turn the crankshaft pulley one revolution (360°) and align the groove with timing mark "T" of the lower timing belt cover.
c. Check only the valves indicated as shown. [No.4 cylinder: TDC/compression]. Measure the valve clearance. (See procedure in step (1))
8. Adjust the intake and exhaust valve clearance.
a. Turn the crankshaft so that the cam lobe of the camshaft on the adjusting valve is upward.
b. Using the special tool (09220-2D000), press down the valve lifter and place the stopper between the camshaft and valve lifter and remove the special tool.
c. Remove the adjusting shim with a small screw driver and magnet.
d. Measure the thickness of the removed shim using a micrometer.
e. Calculate, the thickness of a new shim so that the valve clearance comes within the specified value.
Valve clearance (Engine coolant temperature: 20°C)
T: Thickness of removed shim
A: Measured valve clearance
N: Thickness of new shim
Intake: N = T + [A - 0.20 mm (0.0079 inch)]
Exhaust: N = T + [A - 0.28 mm (0.0110 inch)]
f. Select a new shim with a thickness as close as possible to the calculated value. [Refer to the Adjusting shim selection chart]
NOTE: Shims are available in 20 size increments of 0.04 mm (0.0016 inch) from 2.00 mm (0.079 inch) to 2.76 mm (0.1087 inch)
g. Place a new adjusting shim on the valve lifter.
h. Using the special tool (09220-2D000), press down the valve lifter and remove the stopper.
i. Recheck the valve clearance.
Valve clearance (Engine coolant temperature: 20°C)
[Specification]
Intake: 0.20 mm (0.0079 inch)
Exhaust: 0.28 mm (0.0110 inch)
(Limit] (After adjusting valve clearance)
Intake: 0.17 - 0.23 mm (0.0067 - 0.0091 inch)
Exhaust: 0.25 - 0.31 mm (0.0098 - 0.0122 inch)
��93:
Adjusting shim selection chart (intake)
��:3:
Adjusting shim selection chart (exhaust)
INSTALLATION
1. Remove any sealant material on the cylinder head and cover.
2. Apply sealant (Loctite NO. 5999) to the cylinder head cover.
3. Install the cylinder head cover.
Cylinder head cover: 8 - 10 Nm (80 - 100 kg.cm, 6 - 7 ft. lbs.)
4. Connect the accelerate cable.
5. Connect the PCV hose and the breather hose to the cylinder head cover.
6. Connect the spark plug cables to the spark plugs.
7. Install the upper timing belt cover with the four bolts.
8. Install the center cover with the five bolts.
Center cover: 2.5 - 3.5 Nm (25 - 35 kg.cm, 2 - 3 ft. lbs.)
9. Install the oil filler cap.
10. Install the engine cover.
CHAIN GUIDE
1. Check the chain guide for bend, crack or damage, Replace if necessary.
2. Check the rubber part of chain guide for abnormal wear.
Replace if necessary.
TIMING CHAIN
Check the bushing and plate of the timing chain for wear. Replace if it is worn severely.
REASSEMBLY
1. Install the mechanical tappets and shims.
NOTE: The mechanical tappets and shims must be reinstalled in their original position.
2. Align the camshaft timing chain with the intake timing chain sprocket and exhaust timing chain sprocket as shown.
3. Install the camshaft after lubricating the camshaft journal with engine oil.
4. Install the bearing caps. The markings on the caps are for intake/exhaust identification.
I: Intake camshaft
E: Exhaust camshaft
5. Tighten the bearing caps to the specified torque in two or three steps as shown.
Tightening torque
Bearing cap bolt: 14 - 15 Nm (140 - 150 kg.cm, 10 - 11 ft. lbs.)
6. Using the special tool, camshaft oil seal installer (09221-21000), press the camshaft oil seal. Be sure to apply engine oil to the oil seal lips. Insert the oil seal along the camshaft front end and install by driving the installer with a hammer to 8.5 mm (0.3346 inch) depth from the front end face of the camshaft.
7. Install the camshaft sprocket to the specified torque.
Tightening torque
Camshaft sprocket bolt 100 - 120 Nm (1000 - 1200 kg.cm, 74 - 89 ft. lbs.)
8. Align the camshaft sprocket and crankshaft sprocket timing marks. Place the piston of the No.1 cylinder to top dead center on the compression stroke.
9. Install the cylinder head cover.
Tightening torque
Cylinder head cover bolts 8 - 10 Nm (80 - 100 kg.cm, 6 - 7 ft. lbs.)
10. Install the spark plug cables, ignition coil assembly and cylinder head center cover.
11. Install the timing belt and then tighten the timing belt tensioner pulley.
12. Install the timing belt cover.
Timing belt cover: 8 - 10 Nm (80 - 100 kg.cm, 6 - 7 ft. lbs.)
13. Install the coolant pump pulley and crankshaft pulley.