Timing Chain: Service and Repair
REMOVAL1. Drain the cooling system and crankcase. Remove the oil pan and radiator.
2. Remove the cylinder front cover and water pump, drive belt and crankshaft damper.
3. Remove the camshaft sprocket retaining bolt and the crankshaft sprocket key.
4. Remove the crankshaft and camshaft sprockets with the timing chain.
Timing Chain, Sprockets And Tensioner:
5. Remove the timing chain tensioner and guide.
INSTALLATION
1. Install the timing chain guide to the cylinder block with the pin of the guide inserted into the oil hole in the block. Install the two retaining bolts, and tighten to 10-12 Nm (7-9 ft lb).
2. Position the camshaft so the timing mark will align with the crankshaft. Position the crankshaft so the timing mark will align with the camshaft.
3. Install the crankshaft sprocket, camshaft sprocket and timing chain together.
4. Install the timing chain tensioner with the clip in place to lock the tensioner in the retracted position. Tighten tensioner bolts to 9-11 Nm (7-8 ft lb).
Timing Marks:
5. Install the crankshaft key and check the timing marks on the crankshaft sprocket and camshaft sprocket for correct alignment.
NOTE: Make sure that the tensioner side of the timing chain is held inward, and that the guide side of the chain is straight and tight.
6. Install the camshaft sprocket retaining bolt, and tighten to 60-68 Nm (44-50 ft lb).
7. Remove the clip from the tensioner assembly.
8. Check the camshaft end play.
Camshaft End Play:
CAUTION: Prying against the camshaft gear with the valve train load on the camshaft can break or damage the gear. Therefore, the rocker arm adjusting nuts must be backed off, or the rocker arm and shaft assembly must be loosened sufficiently to free the camshaft. After checking the camshaft end play, adjust the valve clearance.
a. Push camshaft toward rear of engine. Install Dial Indicator TOOL-4201-C or equivalent so indicator point is on camshaft sprocket attaching screw.
b. Zero dial indicator. Pull camshaft forward and release it. Compare dial indicator reading with specifications. Camshaft end play specification is 0.0203-0.1016 mm (0.0008-0.004 in) and camshaft end play service limit is 0.2286 mm (0.009 in). If end play is excessive, replace camshaft thrust plate.
c. Remove dial indicator.
d. After replacing thrust plate, check end play again. If it is still out of specified range, inspect camshaft and cylinder head/cylinder block for excessive wear.
Timing Cover And Bolts:
9. Install the cylinder front cover. Tighten front cover attaching screws to 17-21 Nm (13-15 ft lb). Install the oil pan and radiator.
10. Fill and bleed the cooling system.
11. Fill the crankcase with clean engine oil of the recommended grade and viscosity.
12. Start the engine and operate at fast idle. Check for coolant and oil leaks.