Chevrolet Trax: Cylinder head replacement - Removal Procedure

Special Tools

• EN-470-B Angular Torque Wrench
• EN-955 Fixing Pin
• EN-953-A Fixing Tool

For equivalent regional tools, refer to Special Tools.

Removal Procedure

1. Disconnect battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
2. Remove the turbocharger. Refer to Turbocharger Replacement.
3. Remove the intake manifold. Refer to Intake Manifold Replacement.
4. Remove the water outlet. Refer to Water Outlet Replacement (LUJ, LUV) .
5. Remove the camshaft position actuator solenoid valve intake and exhaust. Refer to Camshaft Position Actuator Solenoid Valve Replacement .
6.  Adjust the engine to TDC. Refer to Camshaft Timing Chain Inspection

Fig. 72: Timing Chain Tensioner Plug

7. Remove the timing chain tensioner plug (1) from the engine front cover.

Fig. 73: Hexagonal Wrench Rotation Direction

NOTE: Remove and reinstall the EN-953-A fixing tool for this step.

8. Install a wrench (1) on the cast hexagonal portion of the intake camshaft, rotate the camshaft toward the exhaust camshaft in order to apply tension.

Fig. 74: Timing Chain Tensioner Bore And Pin

9. Install EN-955 pin (2) to the timing chain tensioner bore (1) to secure it in place.
10. Remove the wrench from intake camshaft.

Fig. 75: Upper Timing Chain Guide And Bolts

11. Remove the upper timing chain guide bolts (1).
12. Remove the upper timing chain guide (2).

Fig. 76: Intake Camshaft Sprocket Bolt And Hexagonal Wrench

13. Loosen the intake camshaft sprocket bolt (2) while holding up the hexagon of the intake camshaft with a wrench (1).
14. Loosen the exhaust camshaft sprocket bolt while holding up the hexagon of the exhaust camshaft with a wrench.

Fig. 77: Camshaft Position Exciter Wheels And Camshaft Sprocket Bolts

15. Remove and DISCARD the camshaft sprocket bolts (2) and the camshaft position exciter wheels (1).
16. Remove the both camshaft position sensors. Refer to Camshaft Position Sensor Replacement .

Fig. 78: Timing Chain And Camshaft Sprockets

17. Remove the camshaft sprockets (2) and timing chain (1) as one unit.
18.  Allow the camshaft sprockets (2) and timing chain (1) rest on the front cover. Do NOT remove sprockets or chain.
19. Install the engine support fixture. Refer to Engine Support Fixture.
20. Remove the engine mount bracket. Refer Engine Mount Bracket Replacement - Right Side.
21. Remove the drive belt. Refer to Drive Belt Replacement.
22. Remove the water pump pulley. Refer to Water Pump Pulley Replacement (LUJ, LUV) .

Fig. 79: Engine Front Cover Bolts And Water Pump Bolts

23. Remove 5 engine front cover bolts (1, 2).
24. Remove 3 water pump bolts (3).
25. Install engine mount bracket. Refer to Engine Mount Bracket Replacement - Right Side.
26. Install engine mount. Refer to Engine Mount Replacement - Right Side.
27. Remove engine support fixture. Refer Engine Support Fixture.

Fig. 80: Cylinder Head Bolts Loosening Sequence

28. Loosen the 12 cylinder head bolts in the sequence as shown above. Use the following procedure:

• First pass: Loosen the cylinder head bolts 90 degrees.
• Final pass: Loosen the cylinder head bolts 180 degrees.

Fig. 81: Cylinder Head, Gasket, Bolts And Guide Sleeves

NOTE: Do not damage the guide sleeves (4, 5).

29. Remove and DISCARD the 12 cylinder head bolts (1).
30.  With the aid of an assistant, lift the timing chain side of the cylinder head assembly slightly in direction of the transmission.
31. Remove the cylinder head (2).
32. Remove the cylinder head gasket (3) and discard the gasket.

Fig. 82: Top Third Of Engine Front Cover Gasket

33. With the cylinder head out of vehicle, bend the top third of the engine front cover gasket (1) back and forth until snaps off at the breaking point.
34. Remove the assembly parts from cylinder head

• Remove the EN-953-A fixing tool
• Remove the intake camshaft. Refer to Intake Camshaft Removal.
• Remove the exhaust camshaft. Refer to Exhaust Camshaft Removal.
• Remove the hydraulic valve lash adjuster arms. Refer to Hydraulic Valve Lash Adjuster Arm Removal.
• Remove the hydraulic valve lash adjusters. Refer to Hydraulic Valve Lash Adjuster Removal.
• Remove the spark plug. Refer to Spark Plug Replacement .
• Remove the engine oil pressure indicator switch.
• Remove the timing chain tensioner. Refer to Timing Chain Tensioner Removal.
• Remove the 3 engine lift brackets.

35. For disassembly of the cylinder head. Refer to Cylinder Head Disassemble.
36. Clean and inspect the cylinder head. Refer to Cylinder Head Cleaning and Inspection.
37. Transfer parts as necessary

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