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Home >> Jeep >> 2023 >> Cherokee Trailhawk >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (2.4L Engine (Service Information) (2 Of 2)) >> Cylinder Head >> Installation

Cylinder Head: Installation

WARNING: This page is about a different variant/trim than selected.
GC0170043Courtesy of CHRYSLER GROUP, LLC
  1. Clean all gasket surfaces.
  2. Install NEW  intake manifold gasket seals (1).
    GC0155603Courtesy of CHRYSLER GROUP, LLC
  3. Install the intake manifold to the cylinder head and tighten the bolts (1 and 2) to the proper torque specification. Refer to TORQUE SPECIFICATIONS .
    GC0155794Courtesy of CHRYSLER GROUP, LLC
  4. Install the intake manifold silencer cover and tighten the screws (1) to the proper torque specification. Refer to TORQUE SPECIFICATIONS .
    GC0155590Courtesy of CHRYSLER GROUP, LLC
  5. Install the throttle body support bracket (2) with the nut (1) and bolt (3) tightened to the proper torque specification. Refer to TORQUE SPECIFICATIONS .
  6. Position the foam insulator over the coolant transfer tube.
    NOTE:

    Apply 3-5 dabs of RTV to the foam insulator where it makes contact with the coolant transfer tube prior to setting the foam insulator in position. This will aid in holding the insulator in the proper position while installing the cylinder head on the engine block. 

    GC0121234Courtesy of CHRYSLER GROUP, LLC
    CAUTION:

    The cylinder head bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down the bolts must be replaced.

  7. Check the cylinder head bolts for necking by holding a scale or straight edge against the threads. If all the threads do not contact the scale (2) the bolt must be replaced.
    GC0169127Courtesy of CHRYSLER GROUP, LLC
    NOTE:

    Ensure cylinder head bolt holes in the block are clean, dry (free of residual oil or coolant), and threads are not damaged.

  8. Install the Variable Valve Actuation Assembly (VVAA) oil supply filter (1) in the engine block.
    GC0121236Courtesy of CHRYSLER GROUP, LLC
  9. Clean the cylinder head sealing surfaces with isopropyl alcohol in preparation for sealant application.
    CAUTION:

    Engine assembly requires the use of a unique sealant that is compatible with engine oil. Using a sealant other than Mopar® Engine Sealant RTV Silicone Rubber Adhesive may result in engine fluid leakage.

    CAUTION:

    Following the application of Mopar® Engine Sealant RTV Silicone Rubber Adhesive to the gasket surfaces, the components must be assembled within 10 minutes and the attaching fasteners must be tightened to specification within the next 10 minutes. Prolonged exposure to the air prior to assembly may result in engine fluid leakage.

  10. Place two pea size dots of Mopar® Engine Sealant RTV Silicone Rubber Adhesive (1) on the cylinder block as shown in illustration.
    GC0173345Courtesy of CHRYSLER GROUP, LLC
  11. Position the new cylinder head gasket (2) on the engine block with the part number facing up. Ensure gasket is seated over the locating dowels (1) in the block.
  12. Place two pea size dots of Mopar® Engine Sealant RTV Silicone Rubber Adhesive (3) on the cylinder head gasket as shown in illustration.
    Fig 1: Cylinder Head Bolts Tightening Sequence
    GC0169951Courtesy of CHRYSLER GROUP, LLC
  13. Position the cylinder head onto the engine block.
    NOTE:

    Make sure the foam pad is not out of position. Inspect the positioning of the pad from below to make sure that no part of the pad is between the cylinder head and the engine block surface. 

  14. Lubricate the cylinder head bolt threads with clean engine oil and install all the cylinder head bolts finger tight.
  15. Tighten the cylinder head bolts in the sequence shown in illustration, following this 4 step torque plus angle method. Tighten according to the following torque values:
    • Step 1: All to 10 N.m (7 ft. lbs.)
    • Step 2: All to 16 N.m (12 ft. lbs.)
    • Step 3: All to 35 N.m (26 ft. lbs.)
    • Step 4: All an additional 160° ± 2° Do not use a torque wrench for this step. 
    GC0169933Courtesy of CHRYSLER GROUP, LLC
    NOTE:

    If the hydraulic lash adjusters are being reused, install them into their original locations.

  16. Install the hydraulic lash adjusters (1).
    GC0170027Courtesy of CHRYSLER GROUP, LLC
    NOTE:

    If the rocker arms are being reused, reassemble them into their original locations.

  17. Apply clean engine oil to the valve tips and the lash adjuster pivot balls.
  18. Install the rocker arms (1).
  19. Apply clean engine oil to the camshaft journals.
  20. Install the camshaft. Refer to CAMSHAFT, ENGINE, INSTALLATION .
  21. Install the Variable Valve Actuation Assembly (VVAA). Refer to ASSEMBLY, VARIABLE VALVE ACTUATION, INSTALLATION .
    GC0169101Courtesy of CHRYSLER GROUP, LLC
  22. Install the timing chain guide (1) and tighten the bolts (2) to the proper torque specification. Refer to TORQUE SPECIFICATIONS .
  23. Install the tensioner arm (4) with the bushing and bolt (3) tightened to the proper torque specification. Refer to TORQUE SPECIFICATIONS .
  24. Install the timing chain, tensioner and engine timing cover. Refer to CHAIN AND SPROCKETS, TIMING, INSTALLATION .
  25. Install the exhaust manifold. Refer to MANIFOLD, EXHAUST, INSTALLATION .
  26. Install the cylinder head cover and ignition coils. Refer to COVER(S), CYLINDER HEAD, INSTALLATION .
  27. Install the thermostat and vacuum pump. Refer to THERMOSTAT, INSTALLATION .
    GC0169941Courtesy of CHRYSLER GROUP, LLC
  28. Connect and lock the fuel injector wire harness connectors (4).
  29. Connect and lock the four VVAA solenoid wire harness connectors (3).
  30. Connect and lock the purge solenoid wire harness connector (1).
    GC0169966Courtesy of CHRYSLER GROUP, LLC
  31. Engage the two wire harness retainers (3) to the intake manifold.
  32. Connect the brake booster hose (1) to the intake manifold, if equipped.
    GC0169971Courtesy of CHRYSLER GROUP, LLC
  33. Insert the foam pad insulator (3) over the fuel rail.
  34. Connect the fuel line (1) to the fuel rail.
  35. Connect the purge vapor line (2) to the purge solenoid.
    GC0155766Courtesy of CHRYSLER GROUP, LLC
  36. Connect the throttle body wire harness connector (1) and install the wire harness retainer (3) to the throttle body (2).
    GC0156353Courtesy of CHRYSLER GROUP, LLC
  37. Install the intake manifold lower bracket (3) and the nuts (1) and bolt (2). Tighten the bolt (2) and nuts (1) to the proper torque specification. Refer to TORQUE SPECIFICATIONS .
    GC0169309Courtesy of CHRYSLER GROUP, LLC
  38. Engage the two wire harness retainers (2) to the intake manifold.
  39. Install the MAP sensor (1). Refer to SENSOR, MANIFOLD ABSOLUTE PRESSURE (MAP), INSTALLATION .
  40. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to ENGINE OIL, STANDARD PROCEDURE .
  41. Install the belly pan, if equipped. Refer to BELLY PAN, INSTALLATION .
  42. Install the transmission skid plate, if equipped. Refer to PLATE, SKID, SIDE, INSTALLATION .
  43. Install the air cleaner body. Refer to BODY, AIR CLEANER, INSTALLATION .
  44. Install the clean air hose and engine cover. Refer to HOSE, CLEAN AIR, INSTALLATION .
  45. Fill the cooling system. Refer to COOLING, STANDARD PROCEDURE .
  46. Connect the negative battery cable. If equipped with an Intelligent Battery Sensor (IBS), connect the IBS connector.
  47. Run the engine until it reaches normal operating temperature. Check cooling system for correct fluid level. Refer to COOLING, STANDARD PROCEDURE .
NOTE:

The Cam/Crank Variation Relearn procedure must be performed using the scan tool anytime there has been a repair/replacement made to a powertrain system, for example: flywheel, valvetrain, camshaft and/or crankshaft sensors or components. Refer to 2.4L, POWERTRAIN VERIFICATION TEST .

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