For 1990-2009 cars

## Camshaft Installation - Right Side LLT

1. 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.
2. Apply a liberal amount of lubricant GM P/N 12345501 (Canadian P/N 992704) or equivalent to the camshaft journals and the right cylinder head camshaft carriers.
3. Place the right intake and right exhaust camshafts in position in the right cylinder head.
4. Position the camshaft lobes in a neutral position with the flats on the back of the camshafts up and parallel (1) with the right cylinder head camshaft cover rail.
5. Observe the markings on the right 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 1, 3, 5 indicates the cylinder position from the front of the engine.

6. Apply a liberal amount of lubricant GM P/N 12345501 (Canadian P/N 992704) or equivalent to the camshaft bearing caps.
7. Install the camshaft bearing thrust caps in the first journal of the right cylinder head.
8. Install the remaining bearing caps with their orientation mark toward the center of the cylinder head.
9. Hand start all the camshaft bearing cap bolts.

Notice: Refer to Fastener Notice in the Preface section.

10. 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).

11. Loosen the center intake camshaft bearing cap bolts (1, 2) and the center exhaust camshaft bearing cap bolts (3, 4).
12. 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).

## Camshaft Installation - Right Side LY7

#### Tools Required

EN 46111 Crankshaft Rotation Socket

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.
2. Make sure that the camshaft sealing rings (1) are in place in the camshaft grooves.
3. Select the proper camshaft for the particular installation location. ID markings are on the rear end of each camshaft. The ID markings are defined as follows:

3.1. | The first five digits refer to the date and time of production.

Example: 3L18H.

3.2. | Digits 6-9 refer to the production code.

LY7 - High Feature V6

3.3. | The last two digits refer to the camshaft position.

- | Example:

- | LI - Left Bank Intake

- | LE - Left Bank Exhaust

- | RI - Right Bank Intake

- | RE - Right Bank Exhaust

4. Apply a liberal amount of engine oil to the camshaft (1) journals and the right cylinder head (2) camshaft carriers.
5. Place the camshafts (1) in position in the right cylinder head (2).
6. Position the camshaft lobes in a neutral position with the flats on the back of the camshafts up and parallel (1) with the right cylinder head camshaft cover rail.
7. Observe the markings on the right cylinder head camshaft bearing caps. Each bearing cap is marked (1) 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 1, 3, 5 indicates the cylinder position from the front of the cylinder block.

8. Apply a liberal amount of engine oil to the camshaft bearing caps.
9. Install the camshaft bearing thrust cap (2) in the first journal of the right cylinder head.
10. Install the remaining bearing caps (2) with their orientation mark toward the center of the cylinder head.
11. Hand start all the camshaft bearing cap to cylinder head retaining bolts (1).

Notice: Refer to Fastener Notice in the Preface section.

12. Tighten the camshaft bearing cap to cylinder head retaining bolts in the sequence shown.

Tighten
Tighten the bolts in sequence to 10 N·m (89 lb in).

13. Loosen the center intake camshaft bearing cap to cylinder head retaining bolts (1, 2) and the center exhaust camshaft bearing cap to cylinder head retaining bolts (3, 4).
14. Retighten the center camshaft bearing cap to cylinder head retaining bolts (1, 2, 3, 4).

Tighten
Retighten the bolts to 10 N·m (89 lb in).