Timing Belt: Service and Repair

REMOVAL AND INSTALLATION

REMOVAL SERVICE POINT
[A] TIMING BELT REMOVAL





1. Align the timing marks.
2. Loosen the center bolt on the tension pulley to remove the timing belt.

CAUTION: Make a mark on the back of the timing belt, indicating the direction of rotation, so it may be reassembled in the same direction, if it is to be reused.

INSTALLATION SERVICE POINTS
]A[ AUTO TENSIONER INSTALLATION
1. If the auto tensioner rod is in its fully extended position, reset it as follows.





1. Keep the auto tensioner level and in that position, clamp it in the vice with soft jaws.
2. Slowly compress the push rod of the auto tensioner until pin hole A is aligned with pin hole B in the cylinder.

CAUTION: The auto tensioner must be placed at a right angle to the pressing surface of press or vice.

CAUTION: Push in the rod slowly to prevent the push rod from being damaged.





3. Insert a wire [1.4 mm (0.055 inch) in diameter] into the pin holes.

NOTE: The wire should be as stiff as possible (such as piano wire, etc.), and should be bent into the shape of an "L".

4. Unclamp the auto tensioner from the vice.

2. Install the auto tensioner.

CAUTION: Leave the wire installed in the auto tensioner.

]B[ TIMING BELT INSTALLATION





1. Align the timing marks of the camshaft sprockets and crankshaft sprocket.
2. Install the timing belt by the following procedure so that there is no deflection in the timing belt between each sprocket and pulley.
1. Crankshaft sprocket
2. Idler pulley
3. Camshaft sprocket (left bank)
4. Water pump pulley
5. Camshaft sprocket (right bank)
6. Tension pulley

CAUTION: The camshaft sprocket (right bank) can turn easily due to the spring force applied, so be careful not to get your fingers caught.

3. Turn the camshaft sprocket (right bank) counterclockwise until the tension side of the timing belt is firmly stretched, and then check again that all timing marks are aligned.





4. Use the special tool to push the tension pulley into the timing belt, and then temporarily tighten the center bolt.





5. Use the special tool to turn the crankshaft 1/4 of a turn counterclockwise and then turn it again clockwise until the timing marks are aligned.





6. Loosen the center bolt on the tensioner pulley. Using the special tool and torque wrench, apply tensioning torque to the timing belt and, at the same time, tighten the center bolt to specification.
Reference value: 4.4 Nm (3.3 ft. lbs.) (Timing belt tensioning torque)

CAUTION: When tightening the center bolt, ensure that the tensioner pulley does not turn with the bolt.





7. Remove the setting pin that has been inserted into the auto-tensioner.
8. Turn the crankshaft two turns clockwise to align the timing marks.





9. Leave everything in this condition for five minutes or more, and then check that the protrusion of the auto-tensioner push rod is within the range of the standard value.
Standard value (A): 4.8 - 6.0 mm (0.189 - 0.236 inch)
10. If the protrusion is out of specification, repeat steps (5) to (9).
11. Check again that timing marks on all sprockets are aligned properly.

INSPECTION
AUTO-TENSIONER





- Check the auto-tensioner for possible leaks.





- Check the push rod for cracks.
1. Hold the auto tensioner by hand and measure contraction (A) when pressing the tip of the rod on a steel (cylinder block; etc.) with a force of 98 - 196 N (22 - 44 lbs.).
Standard value (A): 1 mm (0.04 inch) or less
2. If not within the standard value, replace the auto-tensioner.