Timing Belt: Service and Repair

TIMING BELT





COMPONENTS

DISASSEMBLY





1. Remove the engine cover.
2. Using a [16 mm], rotate the tensioner arm clockwise (about 14°)and remove the belt from the pulley.





3. Remove the power steering pump pulley, idler pulley, tensioner pulley and crankshaft pulley.





4. Remove the upper and lower timing belt covers.





5. 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.

6. 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 glossn, 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.

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: 34.3 - 53.9 Nm (3.5 - 5.5 kg-m, 25.3 - 39.8 ft. lbs.)





3. Install crankshaft sprocket and align the timing mark.





CAUTION: Be careful not to bend crankshaft sensing blade.

4. Install camshaft sprocket.





5. Install auto tensioner to oil pump case.

NOTE: At this time auto tensioner's set pin should be assembled completely.





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 (LH) - Water pump pulley - Intake camshaft sprocket (RH) - Exhaust camshaft sprocket (RH) - Tensioner pulley

NOTE:
^ In this step, No. 1 is in TDC (Compression stroke)
^ Do not insert fingers.

7. After installing the timing belt, reconfirm the timing mark.
8. Rotate the crankshaft 1/4 rotation counterclockwise and then rotate the crankshaft clockwise with align the timing mark.





9. Loosen the center bolt of tensioner pulley. Apply tension for timing belt by rotating the tensioner pulley with SST(09244-28100) and torque wrench.
Tension torque: 0.5 kg-m
10. Tighten the center bolt of tensioner pulley.
Tightening torque: 4.3 - 5.5 kg-m
11. Pull out the set pin of auto tensioner.

THE METHOD TO ADJUST THE TENSION OF TIMING BELT





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 (0.15 - 0.18 inch).





3. Check again if the timing marks of each sprocket is with in specified position.

NOTE: If not within specified position, do again from procedure 5 in the method of installing timing belt and auto tensioner.