Timing Belt: Service and Repair
TIMING BELT
COMPONENTS
REMOVAL
1. Remove the wheel of passenger side.
2. Remove the side cover.
3. Remove the engine cover.
4. Disconnect the power steering hose fixing on the engine mounting bracket.
5. Remove the engine mounting bracket.
CAUTION: Before removing the engine mounting bracket support the engine oil pan with a jack or equivalent so as not to go down the engine.
6. Disconnect the connectors from the timing belt upper cover and remove the upper cover.
7. Remove the drive belt and loosen the 2 alternator mounting nut (14 mm) and 2 bolts (12 mm) connecting the engine support bracket.
8. Loosen the 5 engine support bracket bolts.
CAUTION: To loosen the bolt shown in the forward of engine, first disconnect the alternator.
9. Remove the engine support bracket bolt by moving the engine up and down slightly and remove the bracket upward.
10. Remove the auto tensioner.
NOTE: Rotate the crankshaft clockwise and align the timing mark to set the No. 1 cylinder's piston to TDC (compression stroke). At this time, the timing marks of the camshaft sprocket and cylinder head cover should coincide with each other.
11. Unbolt the tensioner to remove the timing belt.
NOTE: If you plan to use the timing belt again, mark the rotation direction on the belt so you reinstall it correctly.
INSPECTION
1. Inspect the belt closely. If the following problems are evident, replace the belt with a new one.
1 Hardened back surface of rubber Back surface is glossy, non-elastic and so hard that when the nail of your finger is pressed into it, no mark is produced.
2 Cracked back surface of rubber.
3 Side of belt is badly worn.
NOTE: A belt in good condition should have clear-cut sides as if it were cut with a sharp knife.
4 Teeth are badly worn out.
Initial stage: Canvas on load side of the tooth flank worn (fluffy canvas fibers, rubber gone, color changed to white, and unclear canvas texture)
Last stage: Canvas on the load side of the tooth flank worn down and rubber exposed (tooth width reduced).
5 Missing tooth
2. If backlash or an irregular noise is observed when rotating the pulley, replace the timing belt tensioner and idler pulley.
COMPONENTS
INSTALLATION
The method of installing timing belt and auto tensioner.
1. Install idler pulley to engine support lower bracket.
2. Install tensioner arm, shaft and plane washer to cylinder block.
Tightening torque 35 - 55 Nm (350 - 550 kg-cm)
3. Install crankshaft sprocket and align the timing mark.
CAUTION: Be careful not to bend crankshaft sensing blade.
4. Install camshaft sprocket and adjust initial installation state as illustration.
5. Install auto tensioner to oil pump case.
NOTE: If the auto tensioner rod is in its fully extended position, reset it as follows.
1. Clamp it in a vise equipped with soft jaws, in a level position. Use a plain washer if there is a plug at the bottom of the auto tensioner.
2. Compress the rod slowly with the vise until the set hole in the rod is aligned with set hole in the cylinder.
3. Insert a set pin through the auto tensioner body and rod.
CAUTION: Leave the set pin installed in the auto tensioner.
6. Align the timing marks of each sprocket and install the timing belt in this order. Crankshaft sprocket - Idler pulley - Exhaust camshaft sprocket (LH) - Intake camshaft sprocket (RH) - Exhaust camshaft sprocket (RH) - Tensioner pulley
NOTE:
^ In this step, No. 1 is in TDC (Compression stroked
^ Do not insert fingers.
7. After installing the timing belt, reconfirm the timing mark.
8. Pull out the set pin of auto tensioner.
NOTE:
1. Rotate the crankshaft 2 rotation clockwise and measure the projected load of auto tensioner in the TDC (#1 compression stroke) after 5 minutes.
2. Check the projected length is 3.8 - 4.5 mm.
3. Check again if the timing marks of each sprocket is with in specified position.
9. Install the engine support bracket.
10. Install the timing belt cover.
11. Install the alternator and drive belt.
12. Install the engine mounting bracket.
13. Install the side cover.
14. Install the wheel of passenger side.