Timing Components: Service and Repair

Timing Procedure





CAUTION: The camshaft sprockets are not interchangeable from side to side.





1. Place crankshaft sprocket to the Top Dead Center (TDC) mark on the oil pump housing.





2. Install a dial indicator in number 1 cylinder to check TDC of the piston. Rotate the crankshaft until the piston is at exactly TDC. This is important for good engine performance.





3. Install the camshaft alignment Special Tools 6642, or equivalent to the rear of each cylinder head.





4. Preload the tensioner with a vise and install locking pin.





5. Install camshaft sprockets onto the camshafts. Install NEW sprocket attaching bolts into place. The 255 mm (10 inch) bolt is to be installed in the left camshaft and the 213 mm (8 3/8 inch) bolt is to be installed into the right camshaft. Do not tighten the bolts. Camshaft sprocket mark should be positioned between the marks on the cover at both sprocket.





6. Install the timing belt starting at the crankshaft sprocket going in a counterclockwise direction. Install the belt around the last sprocket. Maintain tension on the belt as it is positioned around the tensioner pulley. Each camshaft sprockets mark should still fall between the cover marks.
7. Holding the tensioner pulley against the belt, install the tensioner into the housing and tighten to 28 Nm (250 inch lbs.).
8. When tensioner is in place pull retaining pin to allow the tensioner to extend to the pulley bracket.
9. With number 1 piston at TDC, hold the camshaft sprocket hex with a 36 mm (1 7/16 inch) wrench and tighten the camshaft bolts to 102 Nm (75 ft. lbs.) plus a 90 degree turn for the Right side and 115 Nm (85 ft. lbs.) plus a 90 degree turn for the Left side.
10. Remove dial indicator and install spark plug and tighten to 28 Nm (20 ft. lbs.).
11. Remove camshaft alignment special tools 6642, or equivalent and install cam covers and O-rings. Tighten fasteners to 28 Nm (250 inch lbs.).
12. Install timing belt covers.





13. Install crankshaft damper.
14. Install accessory drive belts.
15. Install air conditioning condenser, radiator and fan module.
16. Evacuate and charge air conditioing system. Refer to Heating and Air Conditioning.
17. Fill cooling system.