Chevrolet TrailBlazer, Service Manual

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1. Install cylinder head bolts 1 through 14 in sequence. Torque the bolts to 22 ft-lb
(30 Nm) . Use a J 45059 angle meter to turn the bolts, in sequence, an additional
155 degrees .
2. Install cylinder head bolts 16 and 17 in sequence. Torque the bolts to 62 in-lb (7
Nm) . Use a J 45059 angle meter to turn the bolts, in sequence, an additional 60
degrees .
3. Install cylinder head bolt 15. Torque the bolt to 62 in-lb (7 Nm) . Use a J 45059
angle meter to turn the bolts, in sequence, an additional 120 degrees .
4. Install the camshafts to the cylinder head with a J 44221 camshaft holding tool
attached to prevent camshaft rotation.
5. Make sure the camshaft position actuator is fully advanced.
6. Align the exhaust camshaft sprocket with the mark on the timing chain.
7. Attach the exhaust camshaft sprocket with the timing chain to the exhaust
camshaft. Hand tighten the new bolt.
8. Align the intake camshaft sprocket with the mark on the timing chain.
9. Attach the intake camshaft sprocket with the timing chain to the intake camshaft.
Hand tighten the new bolt.
10. Attach the timing chain tensioner shoe to the engine. Torque the bolt to 18 ft-lb (25
Nm) .
11. Attach the lower timing guide to the engine. Torque the bolts to 107 in-lb (12 Nm) .
12. Install the cylinder head access hole plugs in to the cylinder head. Torque the plugs
to 44 in-lb (5 Nm) .
13. Torque the intake camshaft sprocket bolt to 15 ft-lb (20 Nm) . Use a J 45059 angle
meter to rotate bolt an additional 100 degrees .
14. Torque the exhaust camshaft sprocket bolt to 18 ft-lb (25 Nm) . Use a J 45059
angle meter to rotate bolt an additional 135 degrees .
15. Detach the J 44221 camshaft holding tool from the back of the camshafts.
16. Remove the EN-48464 lower timing gear tensioner holding tool from the engine
block.
17. Turn the crankshaft clockwise two complete turns until cylinder 1 is at top dead
center.
18. Use a straight edge to verify the timing by placing the straight edge across the flats
of the camshafts. Make sure a 0.005 inch feeler gage can not pass between either
of the camshafts flats and the straight edge. If the gage can pass, then repeat step
19. If the gage can still pass, then the timing will have to be reset.
19. Apply threadlocker GM P/N 89021297 to the upper timing chain guide bolts and
attach the upper timing chain guide to the engine. Torque the bolts to 89 in-lb (10
Nm) .
20. Attach the camshaft cover to the cylinder head. Torque the bolts to 89 in-lb (10
Nm) .
21. Attach the exhaust manifold to the engine.
22. Install the intake manifold on to the engine.
23. Lift the vehicle high enough to gain access to the thermostat housing through the
wheelhouse.
24. Install the thermostat housing into the engine.
25. Install the left front wheel and wheelhouse liner.
26. Lower the vehicle.
27. Drain the oil from the engine.
28. Connect the engine coolant temperature sensor, manifold absolute pressure (MAP)
sensor, ignition coils, throttle body, camshaft sensors, camshaft actuators, fuel rail,
and heated oxygen sensor (HO2S) connectors.