Camshaft Installation - Left Side

Reference: CAMSHAFT CLEANING AND INSPECTION .

Special Tool 

EN 46111 Crankshaft Rotation Socket 

Fig 1: Identifying Timing Drive Assembly

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1. Ensure that the crankshaft is in the stage one timing drive assembly position using the EN 46111. Refer to CAMSHAFT TIMING DRIVE CHAIN ALIGNMENT DIAGRAM (THIRD DESIGN)  and CAMSHAFT TIMING DRIVE CHAIN ALIGNMENT DIAGRAM (FOURTH DESIGN) .
   Fig 2: Identifying Camshaft Sealing Rings

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2. Ensure that the camshaft sealing rings (1) are in place in the camshaft grooves. Camshaft sealing rings must be in place below the surface of the camshaft journal in order to avoid being pinched between the cylinder head and the camshaft caps.
   Fig 3: Identifying Camshaft Identification Ring

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3. Select the proper camshaft for the particular installation location. The ring placement is defined as follows:
   1. The number 4 identification ring for the left intake camshaft is machined off (1) - Third Design, Camshaft Timing Drive System.
   2. The number 5 identification ring for the left exhaust camshaft is machined off (2) - Third Design and Fourth, except High Output, Camshaft Timing Drive System.
   3. The number 3 and 4 identification rings for the left intake camshaft is machined off (3) - Fourth Design, Camshaft Timing Drive System.
   4. The number 1, 2 and 3 identification rings for the left exhaust camshaft is machined off (4) - Fourth Design High Output, Camshaft Timing Drive System.
      Fig 4: Applying Liberal Amount Of Lubricant To Camshaft Journals & Left Cylinder Head Camshaft Carriers

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4. Apply a liberal amount of lubricant GM P/N 12345501 (Canadian P/N 992704) or equivalent to the camshaft journals and the left cylinder head camshaft carriers.
   Fig 5: Identifying Left Intake & Left Exhaust Camshafts

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5. Place the left intake and left exhaust camshafts in position in the left cylinder head.
   Fig 6: Identifying Camshafts Parallel Line

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6. Position the camshaft lobes in a neutral position with the flats on the back of the camshafts up and parallel (1) with the left cylinder head camshaft cover rail.
   Fig 7: Identifying Cylinder Head Camshaft Bearing Caps Mark

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7. Observe the markings on the left cylinder head camshaft bearing caps. Each bearing cap is marked in order to identify its location. The markings have the following meanings:
   • The raised feature must always be oriented toward the center of the cylinder head.
   • The I indicates the intake camshaft.
   • The E indicates the exhaust camshaft.
   • The number 2, 4, 6 indicates the cylinder position from the front of the engine.
8. Apply a liberal amount of lubricant GM P/N 12345501 (Canadian P/N 992704) or equivalent to the camshaft bearing caps.
   Fig 8: Identifying Camshaft Bearing Caps

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9. Install the camshaft bearing thrust cap in the first journal of the left cylinder head.
10. Install the remaining bearing caps with their orientation mark toward the center of the cylinder head.
11. Hand start all the camshaft bearing cap bolts.
    Fig 9: Tightening Camshaft Bearing Cap Bolts

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    CAUTION: Refer to FASTENER NOTICE .
12. Tighten the camshaft bearing cap bolts in the sequence shown in Fig 9.

    Tightening torque 

    Tighten the camshaft bearing cap bolts in sequence to 10 N.m (89 lb in)  .

13. Loosen the center intake camshaft bearing cap bolts 1, 2 and the center exhaust camshaft bearing cap bolts 3, 4.
14. Retighten the center camshaft bearing cap bolts 1, 2, 3, 4.

    Tightening torque 

    Retighten the camshaft bearing cap bolts to 10 N.m (89 lb in)  .

    Reference: CAMSHAFT POSITION ACTUATOR INSTALLATION - LEFT SIDE INTAKE (THIRD DESIGN) .

    Reference: CAMSHAFT POSITION ACTUATOR INSTALLATION - LEFT SIDE INTAKE (FOURTH DESIGN) .