Piston, Connecting Rod, and Bearing Replacement. Buick Roadmaster 1996

For 1990-2009 cars

#### Tools Required

• | J 5239 Connecting Rod Bolt Guide set

• | J 8037 Piston Ring Compressor

• | J 36660-A Torque Angle Meter

### Removal Procedure

1. Remove the oil pan. Refer to Oil Pan Replacement .
2. Remove the oil pump. Refer to Oil Pump Replacement .
3. Remove the cylinder head. Refer to Cylinder Head Replacement .
4. Remove the ring ridge. Complete the following steps:

4.1. | Turn the crankshaft until the piston is at the bottom of its stroke.

4.2. | Place a cloth on top of the piston.

4.3. | Use a ridge reamer in order to remove the ring ridge.

4.4. | Turn the crankshaft so that the piston is at the top of its stroke.

4.5. | Remove the cloth and cutting debris.

Important: Place the match marks or numbers on the connecting rods and the connecting rod caps. The connecting rod caps must be assembled to their original connecting rods.

5. Remove the connecting rod nuts and the connecting rod cap.
6. Remove the connecting rod and the piston out of the top of the engine block using the J 5239
7. Clean the cylinder bores with hot water and detergent or with light honing.
8. Swab the bores with engine oil and a clean, dry cloth.

### Installation Procedure

1. Coat the following parts with engine oil:

• | The piston

• | The piston rings

• | The cylinder bore

• | The bearing surfaces

2. Install the piston into its original bore using the J 5239 and the J 8037 .
3. Lightly tap the top of the piston with a wooden hammer handle.
4. When installing the piston and the connecting rod, the stamped arrow on the piston must point to the front of the engine while the flange on the connecting rod must face toward the front of the piston on the left-hand side and face toward the rear of the piston on the right-hand side.
5. Hold the J 8037 firmly against the engine block until all of the piston rings have entered the cylinder bore.
6. Install the connecting rod caps onto their original connecting rods.
7. Align the match marks or numbers which were placed on the connecting rod and the connecting rod cap during removal.
8. In order to prevent the bearings from moving, install the connecting rods and the connecting rod caps that have the bearing locating notches.
9. Ensure that the notches face each other.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

10. Install the connecting rod nuts.

Tighten
Tighten the connecting rod nuts evenly to 27 N·m (20 lb ft). Use the J 36660-A in order to tighten the nuts an additional 55 degrees.

11. Install the cylinder head. Refer to Cylinder Head Replacement .
12. Install the oil pump. Refer to Oil Pump Replacement
13. Install the oil pan. Refer to Oil Pan Replacement