Camshaft Installation - Left Side LLT
- 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.
- 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.
- Place the left intake and left exhaust camshafts in position in the left cylinder
head.
- 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.
- 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.
- 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.
Notice: Refer to Fastener Notice in the Preface section.
- 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).
Camshaft Installation - Left Side LY7
Tools Required
EN 46111 Crankshaft Rotation Socket
- 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.
- Make sure that the camshaft sealing rings (1) are in place in the camshaft
grooves.
- 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. |
- | RE - Right Bank Exhaust |
- Apply a liberal amount of engine oil to the camshaft (1) journals and
the left cylinder head (2) camshaft carriers.
- Place the camshafts (1) in position in the left cylinder head (2).
- 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.
- Observe the markings on the left 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. |
- Apply a liberal amount of engine oil to the camshaft bearing caps.
- Install the camshaft bearing thrust cap (4) in the first journal of the
right cylinder head (3).
- Install the remaining bearing caps (2) with their orientation mark toward
the center of the cylinder head (3).
- Hand start all the camshaft bearing cap to cylinder head retaining bolts (1).
Notice: Refer to Fastener Notice in the Preface section.
- 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).
- 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).
- 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).