Timing Belt: Service and Repair
COMPONENTS
REMOVAL
1. To remove the engine mounting bracket, support the oil pan with a block of wood and jack until removal is completed.
2. Remove the power steering oil pump with the return hoses connected.
3. Remove the engine support bracket in the numbered sequence shown in the illustration. Slowly remove the reamer bolt indicated by the arrow.
NOTE:
- Keep in mind that the reamer bolt is sometimes heat seized on the engine support bracket.
- To make installation easier, raise the engine as necessary.
4. Remove the crankshaft pulley from the crankshaft and the upper and lower timing belt covers.
5. Loosen the timing belt tensioner bolt and turn the timing belt tensioner counterclockwise along the elongated hole.
6. When reusing the timing belt, mark the direction of travel with an arrow before removing it.
INSPECTION
1. Closely inspect the belt. If the following problems are evident, replace the belt with a new one.
1) Hardened back surface rubber Back surface glossy. Non-elastic and so hard that when your fingernail is pressed into it, no mark is produced.
2) Cracked back surface rubber
3) Cracked or separating canvas
NOTE: A belt in goof condition should have clear-cut sides as if cut with a sharp knife.
4) Badly worn teeth (initial stage)
Canvas on load side tooth flank worn (Fluffy canvas fibers, rubber gone and color changed to white, and unclear canvas texture)
5) Missing tooth
2. If backlash or an irregular noise is observed when rotating the pulley, replace the timing belt tensioner.
REASSEMBLY
Timing belt tensioner and tensioner spring
1. Install the timing belt tensioner.
2. Attach the top of the tensioner spring on the engine coolant pump pinch Install the hook in the direction shown in the illustration.
3. Rotate the timing belt tensioner to the extreme counterclockwise along the elongated hole. Temporarily lock the timing belt tensioner in place.
ADJUSTMENT
1. Align the timing marks of the camshaft sprockets (on the front and rear sides) and the crankshaft sprocket (At the top dead center position of the No.1 cylinder compression stroke.)
2. Route the timing belt on the crankshaft sprocket, then onto the rear camshaft sprocket.
3. Run the timing belt onto the coolant pump pulley, the front camshaft sprocket and the timing belt tensioner.
4. Apply force counterclockwise to the rear camshaft sprocket with tension on the tight side of the belt, check that the timing marks are all aligned.
5. install the flange.
6. Back off the fixing bolts of the temporarily tightened tensioner one or two turns and tighten the timing belt with the tensioner spring force specified.
7. Using the special tool (09231 - 33100), turn the crankshaft two turns in the normal rotating direction (clockwise).
NOTE: Turn smoothly, only in a clockwise direction.
8. Readjust the sprocket timing marks and re-tighten the tensioner locking bolts.
9. Measure the belt tension with a belt tension gauge as shown in the illustration.
Tension force (New): 260 - 380 N (57 - 84 lbs.)
CAUTION: Position the hooks in the tooth bottoms and apply the spindle to the back of the belt.
10. As the mounting bolts of the timing cover are different in size according to location, be sure to locate them according to the illustration.
Thread diameter x height
A: 6 x 60 mm (0.24 x 2.36 inch)
B: 6 x 20 mm (0.24 x 0.79 inch)
11. Using the special tool (09231 - 33200, 09231 - 33300), install the crankshaft pulley on the crankshaft.
Tightening torque:
Crankshaft pulley bolt: 150 - 160 Nm (1,500 -1 ,600 kgs.cm, 108 - 116 ft. lbs.)
12. As the mounting bolts of the engine support bracket are different in size according to location, install them in the recommended sequence.
NOTE: When installing the reamer bolt, tighten it, slowly Gray in lubricant on the reamer area.
To make the installation easier, raise the engine as necessary.
Tread diameter x height
1, 5: 10 x 53 mm (0.39 x 2.09 inch)
2: 10 x 56 mm (0.47 x 2.20 inch)
3, 4: 10 x 40 mm (0.39 x 1.57 inch)
Timing Belt Tension Adjustment
NOTE: The timing belt tension does not normally require adjustment. However, if noise results from the timing belt hitting the cover, timing belt tension should be adjusted using the following procedure.
1. Remove the access cover.
NOTE: This job is easier if the air conditioner compressor belt is removed
2. Loosen the timing belt tensioner mounting bolt 1 to 2 turns.
3. Turn the crankshaft 2 revolutions in a clockwise direction.
4. Tighten the timing belt tensioner mounting bolt.
5. Install the access cover.