Timing Belt: Adjustments

Tension Adjustment

AFTER BELT REPLACEMENT
If the timing belt was replaced (or to adjust tension on a used belt), follow the steps below.





1. Loosen tensioner lock nut, then turn tensioner clockwise and counterclockwise with hexagon wrench at least 2 times.
2. Tighten tensioner lock nut.
3. Turn crankshaft clockwise at least 2 times, then slowly set No. 1 piston at TDC on its compression stroke.





4. Measure deflection of timing belt midway between camshaft pulleys while pushing with 98 N (10 kg, 22 lbs.) force.
Belt deflection when engine is cold (Reference value): 13 - 15 mm (0.51 - 0.59 inch)/98 N (10 kg, 22 lbs.)
5. If NG, return to step 1.

AFTER ENGINE OVERHAUL OR ENGINE REASSEMBLY (WITH ROCKER COVERS REMOVED)
If the engine was overhauled or previously disassembled (i.e. intake manifold and/or cylinder head were removed), follow the steps below.
1. Loosen rocker shaft bolts to relieve belt tension caused by the cam shafts.





2. Loosen tensioner lock nut, keeping tensioner steady with hexagon wrench.
3. Turn tensioner 70 to 80 degrees clockwise with hexagon wrench to release belt tension, and temporarily tighten lock nut.
4. Turn crankshaft clockwise at least two times, then slowly set No. 1 piston at TDC on its compression stroke.





5. Push middle of timing belt between RH camshaft sprocket and tensioner pulley with force of 98 N (10 kg, 22 lbs.) to apply tensions on part A and part B.
6. Loosen tensioner lock nut, keeping tensioner steady with hexagon wrench.





7. Set feeler gauge as shown in figure which is 0.5 mm (0.0206 inch) thick and 12.7 mm (0.500 inch) wide.





8. Turn crankshaft clockwise until feeler gauge is positioned as shown in figure.
- Timing belt will move about 2.5 teeth.
9. Tighten tensioner lock nut, keeping tensioner steady with hexagon wrench.
10. Turn crankshaft clockwise or counterclockwise, and remove feeler gauge.
11. Turn crankshaft clockwise at least two times, then slowly set No. 1 piston at TDC on its compression stroke.





12. Measure deflection of timing belt midway between camshaft pulleys while pushing with 98 N (10 kg, 22 lbs.) force.
Belt deflection when engine is cold (Reference value): 13 - 15 mm (0.51 - 0.59 inch)/98 N (10 kg, 22 lbs.)
13. Install lower and upper belt covers.