Timing Belt: Service and Repair

TIMING BELT REMOVAL AND INSTALLATION

NOTE: Images above refer to numerical service points of removal and installation.

SERVICE POINTS OF REMOVAL

2. REMOVAL OF ENGINE MOUNT BRACKET





(1) Jack up the vehicle after placing a wooden block between the jack and the engine oil pan.

CAUTION: Jack up the vehicle carefully so as not to apply an excessive load to the various parts.

(2) Remove the engine mount bracket.

20. REMOVAL OF TIMING BELT





(1) Turn the crankshaft clockwise and align the timing marks.

CAUTION: The crankshaft must always be turned clockwise.





(2) 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.





(3) Loosen the timing belt tensioner.





(4) Move the timing belt tensioner to the water pump side and tighten the bolt so that the tensioner doesn't return; then remove the timing belt.


CAUTION:

1. As water or oil on the belt can seriously reduce its usable life, ensure that the timing belt, sprocket, and tensioner stay clean and dry while removed, and never wash them. Parts that have become too dirty should be replaced.

2. When any of the parts are oily, check to see whether there are any oil leaks in any of the oil seals or the cam shaft oil seal on the front of the engine.

22. REMOVAL OF OIL PUMP SPROCKET





(1) Remove the plug on the side of the cylinder block.

(2) Insert a Phillips screwdriver with a shank diameter of 8 mm (0.31 in) to block the left silent shaft.

(3) Remove the oil pump sprocket nut.

(4) Remove the oil pump sprocket.

26. REMOVAL OF TIMING BELT "B"





NOTE: 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.

CAUTION: Water or oil on the belt can shorten its life drastically, so the removed timing belt, sprocket, and tensioner must be free from oil and water. These parts should not be washed. Replace parts if seriously contaminated. If there is oil or water on each part check the front case oil seals, camshaft oil seal and water pump for leaks.

INSPECTION

TIMING BELTS

NOTE: The timing belts must be checked closely. Should the following defects be evident, replace the belt with a new one.





(1) Hardened back surface rubber. Glossy, non-elastic, and so hard that no mark is produced even when scratched by a fingernail.





(2) Cracked back surface rubber.

(3) Cracked or separated canvas.

(4) Cracked tooth bottom.

(5) Cracked side.





(6) Abnormal wear on side.

NOTE: Normal belt should have clear-cut sides as if cut by a sharp knife.





(7) Abnormal wear on teeth.

Initial stage: Canvas on load side tooth flank worn (Fluffy canvas fibers, rubber gone and color changed to white, and unclear canvas texture).

Final stage: Canvas on load side tooth flank worn down and rubber exposed (tooth width reduced).

(8) Missing tooth.

TENSIONER PULLEY





NOTE: Turn the pulleys to check for possible binding, excessive play, and unusual noise. Replace the pulley if any of these defects is evident.

SERVICE POINTS OF INSTALLATION

29. INSTALLATION OF CRANKSHAFT SPROCKET "B"





NOTE: Install crankshaft sprocket "B" as shown in image, while paying attention to its direction.

28. INSTALLATION OF SPACER





(1) Apply a thin coat of engine oil to the outer circumference of the spacer.

(2) Install the spacer with the chamfered end facing the oil seal.

NOTE: If the spacer is installed adversely, the oil seal may be damaged, resulting in oil leaks.

26. INSTALLATION OF TIMING BELT "B"





(1) Ensure that crankshaft sprocket "B" timing mark and the silent 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.

ADJUSTMENT OF TIMING BELT "B" TENSION





(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) To ensure that the tension is correct, depress the belt (point A) with a finger. If not, adjust.

Standard value: 5 - 7 mm (0.20 - 0.28 in)

24. INSTALLATION OF FLANGE





NOTE: Install the flange in correct direction as shown in image.

18. INSTALLATION OF TIMING BELT TENSIONER
17. TENSIONER SPRING
16. TENSIONER SPACER

(1) Install the tensioner spring, tensioner spacer and timing belt tensioner.





(2) Place the upper end of the tensioner spring against the water pump body.





(3) Move tensioner fully toward water pump and temporarily secure tensioner.

20. INSTALLATION OF TIMING BELT





(1) Ensure that the timing marks of the camshaft sprocket, the crankshaft sprocket, and the oil pump sprocket are all aligned.





(2) When aligning the timing mark of the oil pump sprocket, remove the plug of the cylinder block and insert a Phillips screwdriver with a shaft diameter of 8 mm (0.31 in) into the plug hole and check to be sure that the screwdriver's shaft can be inserted at least 60 mm (2.36 in). Do not remove the screwdriver until the timing belt is completely attached.

NOTE: If the screwdriver's shaft can be inserted only to a depth of about 20 - 25 mm (0.79 - 0.98 in) because it contacts the silent shaft, turn the sprocket by one rotation and align the timing mark once again; then check again to be sure that the screwdriver's shaft can be inserted at least 60 mm (2.36 in).





(3) Install timing belt while making sure that tension side of belt is not slackened. Install timing belt onto crankshaft sprocket, oil pump sprocket and camshaft sprocket in that order.

CAUTION: If the timing belt is reused, install so that the arrow marked on it at the time of removal is pointing in the clockwise direction.

ADJUSTMENT OF TIMING BELT TENSION





(1) Loosen tensioner mounting bolt. By doing so, tensioner will be moved by spring and will apply tension to belt.

(2) Recheck to be sure that each sprocket's timing mark is correct.





(3) Turn the crankshaft clockwise by two teeth of the camshaft sprocket.

CAUTION: As the purpose of this procedure is to apply the proper amount of tension on the timing belt, be sure not to rotate the crankshaft counter-clockwise or place pressure on the belt to check the amount of tension.





(4) Apply force on tensioner toward turning direction, (in the direction of the arrow) such that no portion of the belt raises out in portion A, place the belt on the camshaft sprocket such that the belt sprocket teeth are fully engaged.

(5) Tighten the tensioner installation bolt and tensioner spacer in that order.

CAUTION: If the tensioner spacer is tightened first, the tensioner will rotate with it and belt tension be thrown out of adjustment. Always tighten the bolt first.





(6) Check to see that the clearance between the outside of the belt and the cover are within the standard value by grasping the tension side (between the camshaft sprocket and oil pump sprocket) of the center part of the timing belt between the thumb and index finger.

Standard value: 14 mm (0.55 in)

11. INSTALLATION OF LOWER/UPPER TIMING BELT COVERS





NOTE: The timing belt lower and upper cover attaching bolts differ in size from one place to another.