Camshaft Installation - Left Side

WARNING: This page is about a different variant/trim than selected.

Fig 1: Identifying Stage One Timing Drive Assembly Position

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Ensure that the crankshaft is in the stage one timing drive assembly position using the EN 46111 . See Special Tools . Refer to Camshaft Timing Drive Chain Alignment Diagram (Third Design) or Camshaft Timing Drive Chain Alignment Diagram (Fourth Design) .

Fig 2: Locating Camshaft Sealing Rings In The Camshaft Grooves

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Ensure that the camshaft sealing rings (1) are in place in the camshaft grooves.

Fig 3: Identifying Camshaft Ring Placement

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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: Lubricating Camshaft Journals And The Left Cylinder Head Camshaft Carriers

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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: View Of Camshafts

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Place the left intake and left exhaust camshafts in position in the left cylinder head.

Fig 6: Camshaft Flats Parallel With Camshaft Cover Rail

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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 Markings On Bearing Caps

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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.
Apply a liberal amount of lubricant GM P/N 12345501 (Canadian P/N 992704) or equivalent to the camshaft bearing caps.

Fig 8: Locating Camshaft Bearing Cap & Bolts

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Install the camshaft bearing thrust cap in the first journal of the left cylinder head.
Install the remaining bearing caps with their orientation mark toward the center of the cylinder head.
Hand start all the camshaft bearing cap bolts.

Fig 9: Identifying Camshaft Bearing Cap Bolts Tightening Sequence

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NOTE: Refer to Fastener Notice .

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