Timing Chain Replacement (In-Vehicle)
CAMSHAFT TIMING CHAIN, SPROCKET, AND TENSIONER REPLACEMENT
REMOVAL
1. Disconnect negative battery cable.
2. Remove the No. 1 cylinder spark plug.
3. Rotate the crankshaft in the engine rotational direction clockwise, until the No. 1 piston is at the top dead center (TDC) on the compression stroke.
4. Remove the front cover.
5. Remove the camshaft cover assembly.
IMPORTANT: The timing chain tensioner must be removed to unload chain tension before the timing chain is removed. If it is not removed the timing chain may become cocked and difficult to remove.
6. Remove timing chain tensioner.
7. Remove upper timing chain guide.
NOTICE: The camshaft sprocket bolts are not reusable, it is a Torque-To-Yield (TTY) bolt, and must be discarded to prevent premature failure.
8. Remove exhaust camshaft sprocket and discard bolt.
9. Remove adjustable timing chain guide.
10. Remove fixed timing chain guide access plug.
11. Remove fixed timing chain guide.
NOTICE: The camshaft sprocket bolt is not reusable, it is a Torque-To-Yield (TTY) bolt, and must be discarded to prevent premature failure.
12. Remove intake camshaft sprocket and discard bolt.
13. Remove timing chain through top of cylinder head.
14. Remove timing chain drive sprocket from crankshaft.
15. Remove timing chain oiling nozzle.
NOTICE: Replace timing chain guides if wear exceeds 1.12 mm (0.045 inch).
16. Inspect the timing chain guides for cracking or wear.
NOTICE: Replace the timing chain tensioner shoe if wear exceeds 1.12 mm (0.045 inch).
17. Inspect the timing chain tensioner shoe for wear.
18. Inspect the timing chain and sprockets for wear.
19. Inspect the camshaft sprocket faces for signs of movement.
20. Inspect camshaft sprocket teeth and chain for signs of excessive wear, chipping, or seizure of timing chain links.
INSTALLATION
1. Install timing chain drive sprocket to crankshaft.
2. Rotate the crank so that mark on sprocket is at the 5 o'clock position.
3. Assemble chain to intake camshaft sprocket alignment copper link to the "INT" diamond timing mark on the camshaft sprocket.
NOTICE: When lowering timing chain rotate assembly 90° to allow chain to fall between cylinder block bosses, then rotate assembly back so that camshaft sprocket is facing forward.
4. Lower assembly through chain housing opening on top of cylinder head. Use care to make sure that chain goes around both sides of cylinder block bosses.
NOTICE: The crankshaft sprocket timing mark will be at approximately the 5 o'clock position.
5. Route chain around crankshaft sprocket and align silver link to the timing mark.
NOTICE: The camshaft sprocket bolt is not reusable, it is a Torque-To-Yield (TTY) bolt, and must be discarded to prevent premature failure.
6. Install intake camshaft sprocket loosely onto intake camshaft and install new camshaft sprocket bolt finger tight. It is not necessary to align sprocket-to-camshaft offset notch at this time.
7. Install adjustable timing chain guide through opening on top of cylinder head and install chain guide bolt.
Torque: Timing Chain Guide (Adjustable Bolt: 10 Nm (89 inch lbs.)
8. Install exhaust camshaft sprocket loosely onto exhaust camshaft with timing mark on sprocket aligned with silver link and install new camshaft sprocket bolt finger tight. It is not necessary to align sprocket-to-camshaft offset notch at this time.
NOTICE: The camshaft sprocket bolt is not reusable, it is a Torque-To-Yield (TTY) bolt, and must be discarded to prevent premature failure.
9. Align camshaft sprocket-to-camshaft and tighten camshaft bolt using the following procedure.
NOTICE: Do not rotate either camshaft more than 1/2 turn in either direction with crankshaft at Top Dead Center (TDC). To do so may cause valve to piston contact resulting in a damaged valve and/or a damaged piston.
9.1. Ensure sprocket timing mark is at 5 o'clock position.
9.2. Rotate intake camshaft using a 24 mm wrench on flats of camshaft until sprocket-to-camshaft alignment notch seats.
9.3. When sprocket seats on camshaft, tighten sprocket bolt finger tight.
9.4. Rotate exhaust camshaft using a 24 mm wrench on flats of camshaft until sprocket-to-camshaft alignment notch seats.
9.5. When sprocket seats on the camshaft, tighten sprocket bolt finger tight.
10. Verify that all colored links are aligned with appropriate marks on camshaft and crankshaft sprockets. If they are not, repeat steps 8 through 10.
11. Install fixed timing chain guide and bolts.
Torque:
Timing Chain Guide (Fixed) Bolts: 10 Nm (89 inch lbs.)
12. Install fixed timing chain guide bolt access hole plug.
Torque:
Timing Chain Guide Bolt Access Hole Plug: 40 Nm (30 ft. lbs.)
13. Install upper timing chain guide and bolts.
Torque:
Timing Chain Guide (Upper) Bolts: 10 Nm (89 inch lbs.)
NOTICE: Use a 24 mm wrench to support the camshaft while applying torque to camshaft sprocket bolt. Do not torque camshaft bolts against timing chain, as it may damage the timing chain.
14. Tighten intake and exhaust camshaft sprocket bolts.
Torque:
Camshaft Sprocket Bolts: 85 Nm (63 ft. lbs.) + 30°
15. Install sealing ring and tensioner assembly.
Torque:
Timing Chain Tensioner Bolts: 75 Nm (55 ft. lbs.)
16. Install timing chain oil nozzle and bolt.
Torque:
Timing Chain Oil Nozzle Bolt: 10 Nm (89 inch lbs.)
17. Install camshaft cover assembly.
18. Install engine front cover.
19. Connect negative battery cable.
Torque:
Battery Terminal Bolts: 17 Nm (13 ft. lbs.)