Timing Belt: Service and Repair
TIMING BELT
Pre-removal Operation:
- Under Cover Removal.
- Engine Mount Bracket Removal
Removal
Follow removal steps outlined in illustration.
Removal Service Points
[A] Timing belt front center cover.
Remove the stud bolt of the engine support bracket, and remove the timing belt front center cover.
[B] Timing belt removal.
1. Turn the crankshaft in the forward direction (to the right) to align the camshaft sprocket timing marks.
CAUTION: Always turn the crankshaft in the forward direction only.
2. Loosen the tension pulley center bolt.
3. Move the tension pulley to the water pump side, and then remove the timing belt.
CAUTION: If the timing belt is to be re-used, use chalk to mark (on its flat side) an arrow indicating the clock-wise direction.
Installation
Installation in reverse order of removal.
Installation Service Points
]A[ Auto tensioner installation.
1. Apply 98 - 196 Nm (22 - 44 lbs.) force to the auto tensioner by pressing it against a metal (cylinder block,..etc.), and measure the movement of the push rod.
A: Length when it is free (not pressed)
B: Length when it is pressed
A - B = Movement
Standard value: Within 1 mm (0.04 inch)
2. If it is out of the standard value, replace the auto tensioner.
3. Use a press or vise to gently compress the auto tensioners push rod until pin hole A of the push rod and pin hole B of the tensioner cylinder are aligned.
CAUTION: If the compression speed is too fast, the rod may become damaged, so be sure to carry out this operation slowly.
4. Once the holes are aligned, insert the set pin.
NOTE: When replacing the auto tensioner with a new part, the pin will be in the auto tensioner.
5. Install the auto tensioner to the engine.
]B[ Timing belt installation.
1. Align the timing marks on the camshaft sprocket, crankshaft sprocket and oil pump sprocket.
2. After aligning the timing mark on the oil pump sprocket, remove the cylinder block plug and insert a Phillips screwdriver with a diameter of 8 mm (0.32 inch), and check to be sure that the screwdriver goes in 60 mm (2.36 inch) or more. If the screwdriver will only go in 20 - 25 mm (0.79 - 0.98 inch) before striking the counterbalance shaft, turn the sprocket: once, realign the timing mark and check that the screwdriver goes in 60 mm (2.36 inch) or more. Do not take out the screwdriver until the timing belt is installed.
3. Install the timing belt so as not to be loosened among the sprockets, by the following procedure.
CAUTION: If the timing belt is to be reused, install it so that the mark indicates the clockwise direction.
1. Install the timing belt around the intake side camshaft sprocket and fix it at indicated position by a bulldog clip.
2. Install the timing belt around the exhaust side sprocket, aligning the timing marks with the cylinder head top surface using two wrenches.
3. Fix the belt at indicated position by another bulldog clip.
4. Install the timing belt around the idler pulley, the oil pump sprocket, the crankshaft sprocket and the tensioner pulley in the order shown.
5. Remove the two bulldog clips.
4. Set the tension pulley so that the pin holes are at the bottom, press the tension pulley lightly against the timing belt.
5. Screw the tool into the engine left support bracket until its end makes contact with the tensioner arm. At that point, screw the tool in some more and then remove the set wire attached to the auto tensioner.
6. Remove the tool.
7. Tighten the center bolt to the specified torque.
Specified torque: 48 Nm (35 ft.lbs.)
]C[ Timing belt tension adjustment.
1. After turning the crankshaft 1/4 of a revolution in the counterclockwise direction, turn it in the clockwise direction until the timing marks are aligned.
2. Loosen the tension pulley fixing bolt, and then use the special tool and a torque wrench to tighten the fixing bolt to the specified torque while applying tension to the timing belt.
Standard value: 3.5 Nm (2.6 ft. lbs.)
CAUTION: When tightening the fixing bolt, do not let the tension pulley turn with the bolt.
3. Turn the crankshaft two revolutions clockwise so that the timing marks are aligned. After leaving it for 15 minutes, measure the amount of protrusion of the auto tensioner.
Standard value (A): 3.8 - 4.5 mm (0.150 - 0.177 inch)
4. If the amount of protrusion is outside the standard value, repeat the operation in steps (1) to (3).
5. Check again that the timing marks of each sprocket are aligned.
]D[ Timing Belt Front Lower Cover/ Timing Belt Front Center Cover/ Timing Belt Front Upper Cover Installation.
Install the bolts, being careful not to mistake the bolt sizes.
Post-installation Operation:
- Under Cover Installation.
- Engine Adjustment.
- Engine Mount Bracket Installation.
TIMING BELT B
Removal
CAUTION: If timing belt "63" is to be re-used, use chalk to mark it with an arrow on its flat side indicating the turning direction (to the right).
Follow removal steps outlined in illustration.
Removal Service Points
[A] Crankshaft sprocket removal.
1. Use the special tool to remove the bolt.
2. Use the special tool to remove the crankshaft sprocket.
[B] Timing belt B removal.
Installation
Installation in reverse order of removal.
Installation Service Points
]A[ Timing belt B installation.
Install timing belt "B" by the following procedure.
1. Ensure that crankshaft sprocket "B" timing mark and the counterbalance shaft sprocket timing mark are aligned.
2. Fit timing belt "B" over crankshaft sprocket "B" and the silent shaft sprocket. Ensure that there is no slack in the belt.
]B[ Timing belt B tension adjustment.
Adjust the tension of timing belt "B" bit the following procedure.
1. Temporarily fix the timing belt "B" tensioner such that the center of the tensioner pulley is to the left and above the center of the installation bolt, and temporarily attach the tensioner pulley so that the flange is toward the front of the engine.
2. Holding the timing belt "B" tensioner up with your finger in the direction of the arrow, place pressure on the timing belt so that the tension side of the belt is taut. Now tighten the bolt to fix the tensioner.
CAUTION: When tightening the bolt, ensure that the tensioner pulley shaft does not rotate with the bolt. Allowing it to rotate with the bolt can cause excessive tension on the belt.
3. Press the belt at the shown point by a finger to check belt tension. If not, adjust.
Standard value: 5 - 7 mm (0.20 - 0.28 inch)
]C[ Crankshaft sensing blade installation.
When installing, make sure the direction is correct.
]D[ Crankshaft sprocket installation.
Use the special tool to install the crankshaft sprocket and bolt.
NOTE: Apply the minimum amount of engine oil to the bearing surface and thread of the crankshaft bolt.