Lexus NX: Installation

INSTALLATION

CAUTION / NOTICE / HINT

HINT:

Perform "Inspection After Repairs" after replacing the cylinder head sub-assembly.

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PROCEDURE

1. INSTALL CYLINDER HEAD GASKET

(a) Clean the cylinder block and cylinder head sub-assembly with solvent.

(b) Apply a seal packing to a new cylinder head gasket as shown in the illustration.

*1

Cylinder Block

*2

Cylinder Head Gasket

*a

Lot No.

*b

3.0 to 7.0 mm (0.118 to 0.276 in.)

*c

20 mm (0.787 in.) or more

*d

7.0 mm (0.276 in.)

*e

3.0 mm (0.118 in.) or more

Seal Packing Application Area

Engine Front

Seal packing:

Toyota Genuine Seal Packing Black, Three Bond 1207B or equivalent

Standard seal dimension:

3.0 to 7.0 mm (0.118 to 0.276 in.) wide and 3.0 mm (0.118 in.) thick

NOTICE:

  • Remove any oil from the contact surface.
  • Install the cylinder head gasket within 3 minutes and tighten the bolts within 15 minutes after applying seal packing.

HINT:

Apply at least 20 mm (0.787 in.) of seal packing from the inside edge of the protrusion of the cylinder block.

(c) Place a new cylinder head gasket on the cylinder block surface with the front face of the Lot No. stamp upward.

NOTICE:

Pay attention to the installation direction.

2. INSTALL CYLINDER HEAD SUB-ASSEMBLY

HINT:

Perform "Inspection After Repairs" after replacing the cylinder head sub-assembly.

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(a) Place the cylinder head sub-assembly on the cylinder block.

NOTICE:

  • Make sure that no oil is on the mounting surface of the cylinder head sub-assembly.
  • Place the cylinder head sub-assembly on the cylinder block gently in order not to damage the gasket with the bottom part of the head.

HINT:

The cylinder head set bolts are tightened in 4 progressive steps.

(b) Install the plate washers to the cylinder head set bolts.

(c) Apply a light coat of engine oil to the threads and under the heads of the cylinder head set bolts.

(d) Step 1:

(1) Using a 10 mm bi-hexagon wrench, install and uniformly tighten the 10 cylinder head set bolts in several steps in the sequence shown in the illustration.

Torque:

36 N·m {367 kgf·cm, 27 ft·lbf}

NOTICE:

Do not drop the plate washers for the cylinder head set bolt into the cylinder head sub-assembly.

(e) Step 2:

(1) Tighten the cylinder head set bolts again in the sequence shown in the illustration to make sure that they are tightened to the specified torque.

Torque:

36 N·m {367 kgf·cm, 27 ft·lbf}

(f) Step 3:

(1) Mark the front side of each cylinder head set bolt head with paint.

(2) Tighten the cylinder head set bolts 90° in the sequence shown in step 1.

(g) Step 4:

(1) Tighten the cylinder head set bolts another 90° in the sequence shown in step 1.

(2) Check that the paint marks are now at a 180° angle to the front.

NOTICE:

  • Do not apply oil for at least 4 hours after the installation.
  • Do not start the engine for at least 4 hours after the installation.
  • After the installation, if the seal packing has seeped out, wipe it off.

3. INSTALL VALVE STEM CAP

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4. INSTALL VALVE LASH ADJUSTER ASSEMBLY

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5. INSTALL NO. 1 VALVE ROCKER ARM SUB-ASSEMBLY

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6. INSTALL NO. 2 CAMSHAFT BEARING

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7. INSTALL NO. 1 CAMSHAFT BEARING

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8. INSTALL NO. 2 CAMSHAFT

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9. INSTALL CAMSHAFT

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10. INSTALL OIL CONTROL VALVE FILTER

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11. INSTALL CAMSHAFT BEARING CAP

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12. INSTALL CAMSHAFT HOUSING SUB-ASSEMBLY

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13. INSTALL CAMSHAFT TIMING GEAR ASSEMBLY

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14. INSTALL CAMSHAFT TIMING SPROCKET

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15. ADD ENGINE OIL

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16. INSTALL NO. 1 CHAIN VIBRATION DAMPER

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17. INSTALL CHAIN SUB-ASSEMBLY

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18. INSTALL CHAIN TENSIONER SLIPPER

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19. INSTALL NO. 1 CHAIN TENSIONER ASSEMBLY

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20. INSTALL TIMING CHAIN GUIDE

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21. CHECK NO. 1 CYLINDER TO TDC/COMPRESSION

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22. INSTALL INJECTOR VIBRATION INSULATOR

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23. INSTALL FUEL DELIVERY PIPE

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24. INSTALL INTAKE MANIFOLD

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25. TEMPORARILY INSTALL NO. 1 EGR PIPE

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26. INSTALL NO. 1 WATER BY-PASS HOSE

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27. INSTALL NO. 3 WATER BY-PASS HOSE

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28. TEMPORARILY INSTALL EGR VALVE ASSEMBLY

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29. TEMPORARILY INSTALL EGR COOLER ASSEMBLY

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30. INSTALL WATER BY-PASS PIPE

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31. TIGHTEN NO. 1 EGR PIPE

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32. TIGHTEN EGR COOLER ASSEMBLY

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33. TIGHTEN EGR VALVE ASSEMBLY

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34. INSTALL THROTTLE WITH MOTOR BODY ASSEMBLY

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35. INSTALL EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY

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36. INSTALL TIMING CHAIN COVER ASSEMBLY

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