Camshaft Installation - Left

Tools Required: 

EN 46111  Crankshaft Rotation Socket

Fig 1: Identifying Stage One Timing Drive Assembly Position
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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 .
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.
Fig 3: Identifying Camshaft Identification Rings
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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).
   2. The number 5 identification ring for the left exhaust camshaft is machined off (2).
Fig 4: Applying 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: Removing & Installing 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 Camshaft Lobes In A Neutral Position
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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 Left Cylinder Head Camshaft Bearing Caps
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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: Installing Left Camshaft Bearing Caps
Courtesy of GENERAL MOTORS CORP.
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: Identifying Left Camshaft Bearing Cap Bolt Tightening Sequence
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NOTE: Refer to Fastener Notice in Cautions and Notices.
12. Tighten the camshaft bearing cap bolts in the sequence shown.

    Tighten:  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.

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