Buick Regal: Piston and Connecting Rod Assemble

Special Tools

• EN-46745 Piston Pin Clip Remover/Installer
• EN-46745-4 Piston Pin Clip Remover/Installer Adapter

For equivalent regional tools, refer to Special Tools.

1.

NOTE: Install the piston onto the connecting rod with the arrow on top of the piston oriented to the same side as the cast feature at the split line of the connecting rod.

The arrow (1), on the top of the piston, must go to the front of the block.

2. The feature at the split line (4), located on one side of the connecting rod, must go to the front of the block.

3. Assemble the connecting rod (3) and the piston (2).

4.

CAUTION: Install the piston pin retainers correctly in the retaining groove during assembly in order to avoid engine damage.

NOTE: Use NEW retainers. Two retainers hold each piston pin in place.

NOTE: Use the appropriate adapter for EN-46745 installer to install the retainers. The appropriate adapter will fit the piston pin ID and allow the ring to be removed or installed.

• For LCV/LKW/LD4 piston pin, use EN-46745-2 adapter.
• For LTG piston pin, use EN-46745-4 adapter.

Use the following procedure to assemble the piston pin and the retainer:

1. Coat the piston pin with oil.
2. Install one NEW piston pin retainer into the retaining groove using EN-46745 installer and the appropriate adapter. Rotate the retainer until it is fully seated in the groove.
3. Install the connecting rod and the piston pin.

   Push the piston pin until it bottoms in the previously installed retainer.

4. Install the second NEW piston pin retainer, using EN-46745 installer (1) and the appropriate adapter.
5. Ensure that the piston moves freely.

5.

The piston ring end gaps must be positioned 90 degrees to each other.

• Upper compression ring joint (1)
• Lower compression ring joint (2)
• Upper oil ring rail joint (5)
• Oil ring rail spacer joint (4)
• Lower oil ring rail joint (3)

6.

CAUTION: Use a piston ring expander to install the piston rings. The rings may be damaged if expanded more than necessary.

Install the following components of the oil control ring assembly:

1. The piston oil ring rail (5)
2. The piston oil ring rail spacer (4)
3. The second piston oil ring rail (3)

7. Install the piston lower compression ring (2). Place the manufacturer's mark facing up.

8. Install the piston upper compression ring (1).

CAMSHAFT ASSEMBLY DISASSEMBLE

Preliminary Procedures

1. Temporarily install the cylinder head to the engine block, with the engine block securely attached to a mounting device.

2. Temporarily install the engine front cover to the cylinder head, using the upper bolts to hold the cover in position.

3. Install one of the camshafts in the exhaust camshaft position on the cylinder head.

4. Install the camshaft bearing front upper cap and bolts.

5. Install the camshaft bearing caps and bolts.

6. Install EN-50793 locking tool onto the camshaft actuator and engine front cover.

7. The camshaft actuator bolt can now be loosened and the actuator removed from the camshaft. Repeat preliminary procedure for the remaining camshaft assembly.

1. Camshaft, Intake and Exhaust
2. Camshaft Position Actuator Bolt
   NOTE: Discard the bolt.
   Special Tools
   EN-50793 Camshaft Actuator Locking Tool
   For equivalent regional tools, refer to Special Tools.
3. Camshaft Position Actuator, Intake and Exhaust

CAMSHAFT CLEANING AND INSPECTION

1.

Inspect the camshaft journals and lobes for wear or scoring.

2. Inspect the camshaft sprocket alignment notch for damage.

3. Wash the camshafts (1, 2) in solvent.

4. Oil the camshafts.

CAMSHAFT ASSEMBLY ASSEMBLE

Preliminary Procedures

1. Temporarily install the cylinder head to the engine block, with the engine block securely attached to a mounting device.

2. Temporarily install the engine front cover to the cylinder head, using the upper bolts to hold the cover in position.

3. Install one of the camshafts in the exhaust camshaft position on the cylinder head.

4. Install the camshaft bearing front upper cap and bolts.

5. Install the camshaft bearing caps and bolts.

6. Install the appropriate actuator for the camshaft currently installed on the cylinder head.

7. Install EN-50793 locking tool onto the camshaft actuator and engine front cover.

8. The camshaft actuator bolt can now be installed and tightened to final specification. Repeat preliminary procedure for the remaining camshaft assembly.

1. Camshaft, Intake and Exhaust
   NOTE: Ensure that the oil seal near the front of the camshaft is rotated so that the split line on the oil seal is aligned with the notch, and both the notch and split line are at 12 O'clock when installed on the cylinder head.
2. Camshaft Position Actuator, Intake and Exhaust
   NOTE: Upon camshaft assembly, ensure the camshaft actuator pin aligns with the camshaft notch. The actuator, camshaft, and bolt can be assembled by hand and then placed on the cylinder head for final torque.
   NOTE: Lubricate the actuator prior to installation.
3. Camshaft Position Actuator Bolt
   CAUTION: Refer to Fastener Caution.
   CAUTION: This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fastener could cause damage to the vehicle or component.
   Tighten 30 N.m (22 lb ft) plus 100 Degrees.
   Special Tools
   EN-50793 Camshaft Actuator Locking Tool
   For equivalent regional tools, refer to Special Tools.

CAMSHAFT TIMING CHAIN, SPROCKET, AND TENSIONER CLEANING AND INSPECTION

1.

Inspect the timing chain guides (3, 7) and timing chain tensioner pivot arm (1) for cracking or wear.

2. Replace the timing chain guides if wear exceeds 1.12 mm (0.045 in) depth on the chain guide surface.

3. Inspect the timing chain tensioner (13) shoe for wear.

4. Replace the timing chain tensioner if shoe wear exceeds 1.12 mm (0.045 in) depth on the chain guide surface.

5. Inspect the timing chain (4) and actuators (2, 5) for wear.

6. Inspect the camshaft actuator faces for signs of movement.

7. Inspect the camshaft actuator teeth and chain for signs of excessive wear, chipping, or seizure of the timing chain links.

8. Inspect the timing chain oil nozzle (6) for collapse or cracks at the bolt boss. Discard and replace the oil nozzle body if it is damaged.

9. Verify oil nozzle oil flow with compressed air.

10. Inspect the timing chain tensioner (13) for scoring or free movement.

11. Inspect the timing chain tensioner washer. If damaged, replace the timing chain tensioner.

12. Inspect the crankshaft sprocket (12) for excessive wear or chipping.

13. Inspect the balancer chain (8) for wear.

14. Inspect the balancer chain guide (11) for wear.

15. Inspect the balancer chain tensioner (9) for wear.

16. Inspect the balancer shaft driven sprocket (10) for wear or chipping.

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