Timing Chain and Sprockets Replacement - Camshaft
Removal ProcedureCaution: Refer to Battery Disconnect Caution in Service Precautions.
1. Disconnect the negative battery cable.
2. Remove the timing chain housing. Refer to Timing Chain Housing Replacement.
3. Remove the spark plugs in order to make rotating the crankshaft to line up the timing marks easier.
Important:
^ The timing marks must be correctly aligned before disassembly in order to correctly install the timing chains.
^ Avoid turning the camshafts and the crankshaft once the timing chain is removed. Valve and piston damage may occur.
^ If necessary, the camshafts (1) may be turned 15 degrees from the notches (6) on the cylinder head in either direction.
^ If necessary, the crankshaft (5) may be turned 90 degrees from the mark (4) on the engine block in either direction.
4. Rotate the crankshaft so that the following conditions are met:
^ The number 1 (front most) cylinder is at the Top Dead Center (TDC) position.
^ The keyway on the crankshaft (5) aligns with the mark on the engine block (4).
^ The arrow (3) on the idler sprocket is pointing upward.
^ The guide pins (1) on the camshaft sprockets line up with the notches (6) on the cylinder head.
5. Relieve the tension on the camshaft timing chain by turning the intake camshaft slightly counterclockwise.
6. Remove the nut and 2 bolts (1,2).
7. Remove the camshaft timing chain tensioner and the gasket.
8. Hold the camshaft with a wrench and remove the camshaft sprocket bolts (1).
9. Remove the camshaft sprockets and chain.
10. Inspect the following components for wear and damage:
^ The camshaft timing chain upper guide
^ The camshaft timing chain tensioner
^ The camshaft timing chain tensioner gasket
^ The camshaft timing chain sprockets
^ The camshaft timing chain
11. Replace worn or damaged components as necessary.
Installation Procedure
1. Ensure that the crankshaft keyway is aligned with the mark on the engine block (3).
2. Ensure that the idler sprocket arrow (2) is pointing upward.
3. Ensure that the camshaft guide pins (1) are aligned with the notches (3) on the cylinder head.
4. Align the yellow link (1) of the camshaft timing chain with the arrow (2) on the idler sprocket.
5. Align the dark blue link (1) of the camshaft timing chain with the arrows (2,3) on the camshaft sprockets.
6. Align the camshaft sprockets with the guide pins and install the camshaft timing sprockets and chain.
Notice: Refer to Fastener Notice in Service Precautions.
7. Install the camshaft sprocket bolts (1).
^ Tighten the bolts to 80 Nm (58 ft. lbs.).
8. Compress the camshaft tensioner plunger into the body. Insert a retainer (a paper clip or similar tool) through the hole in the body in order to hold the plunger in place.
9. Install the gasket and the camshaft timing chain tensioner.
^ Tighten the bolts (1) to 11 Nm (97 inch lbs.).
^ Tighten the nut (2) to 45 Nm (33 ft. lbs.).
10. Remove the retainer from the tensioner.
11. Turn the crankshaft 2 revolutions realigning the keyway on the crankshaft (5) with the timing mark on the engine block (4).
^ Ensure that the guide pins on the camshafts (1) are in line with the notches on the cylinder head (6).
^ Apply engine oil to the following:
^ The timing chains
^ The tensioner
^ The guides
^ The sprockets
14. Install the spark plugs.
^ Tighten the spark plugs to 25 Nm (18 ft. lbs.).
15. Install the timing chain housing. Refer to Timing Chain Housing Replacement.
16. Connect the negative battery cable.