Cylinder Head Cleaning and Inspection. Buick Roadmaster 1996

For 1990-2009 cars

#### Tools Required

• | J 9666 Valve Spring Tester

• | J 8001 Dial Indicator

• | J 8089 Carbon Removal Brush

1. Use the J 8089 in order to clean the carbon from the combustion chambers and the valve parts. Be careful not to scuff the chamber
2. Clean the following areas:

2.1. | The carbon and the sludge from the valve pushrods and the valve rocker arms

2.2. | The valve stems and heads on a buffing wheel

2.3. | The cylinder head and engine block gasket surfaces

2.4. | The bolt hole threads in the cylinder heads and the engine block

3. Inspect the following areas:

3.1. | The cylinder head for cracks in the exhaust ports and combustion chambers

3.2. | The cylinder head for external cracks in the water chamber

3.3. | The valves for burned heads, cracked faces, or damaged stems

3.4. | The valve springs for squareness

4. Use the J 9666 in order to measure the valve spring.

• | Replace the spring if the spring tension is less than 338 N·m (76 lb) at 1.70 in (1.70 in).

5. Measure the valve stem-to-bore clearance.

• | Excessive valve stem-to-bore clearance will cause an excessive oil consumption and may case a valve to break. Insufficient clearance will result in noisy and sticky functioning of the valve and will disturb the engine assembly smoothness.

• | Clamp the J 8001 on the exhaust port side of the cylinder head.

• | Locate the indicator so that the movement of the valve stem from side to side (crosswise to the cylinder head) will cause a direct movement of the indicator stem.

• | The indicator stem must contract the side of the valve stem just above the valve guide.

• | Drop the valve head about 1.6 mm (0.0064 in.) off the valve seat.

• | Use light pressure when moving the valve stem from side to side in order to obtain a clearance reading.