Lang Tools Air Hold Fitting Set (901)

The Lang Tools Air Hold Fitting Set (901) is an essential tool for automotive technicians and enthusiasts performing engine valve service. This specialized set allows for the application of air pressure directly into an engine's cylinders through the spark plug openings. By introducing compressed air, the engine valves are held firmly in their closed position. This critical function eliminates the necessity of removing the entire cylinder head when replacing valve seals or valve springs, significantly reducing repair time and complexity. Designed for practicality and efficiency, the set includes two common spark plug thread adapters to ensure compatibility with a wide range of gasoline engines.

KEY FEATURES AND BENEFITS:

• Efficient Valve Service: Enables the replacement of valve seals and springs without the labor-intensive process of cylinder head removal.
• Air Pressure Application: Utilizes compressed air to keep engine valves securely closed during service.
• Broad Compatibility: Includes M14 and M18 adapters, fitting common spark plug thread sizes for various engine types.
• Standard Air Connection: Adapters are threaded for 1/4" NPT, allowing easy connection to standard air hoses and compressors.
• Time-Saving Tool: Streamlines engine maintenance tasks, reducing overall repair time and effort.

SPECIFICATIONS:

• Included in Product: The set includes one M14 air hold adapter and one M18 air hold adapter.
• Air Hose Connection: 1/4" NPT

HOW TO USE:

1. Prepare the Cylinder: Identify the cylinder on which you intend to perform valve service. Rotate the engine until the piston for that cylinder is at or near top dead center (TDC) on its compression stroke. This helps ensure both valves are closed.
2. Remove Spark Plug: Carefully remove the spark plug from the chosen cylinder.
3. Select Adapter: Choose the appropriate air hold adapter (M14 or M18) that matches the spark plug thread size of the cylinder head.
4. Install Adapter: Screw the selected air hold adapter into the spark plug port until it is securely seated. Do not overtighten.
5. Connect Air Hose: Attach a standard 1/4" NPT air hose from your air compressor to the threaded end of the air hold fitting.
6. Apply Air Pressure: Slowly apply compressed air pressure to the cylinder. The air pressure will push against the valves, holding them firmly in their closed position. Maintain consistent air pressure throughout the valve service.
7. Perform Service: With the valves held in place, proceed with replacing valve seals or valve springs using appropriate valve spring compressors.
8. Release Pressure and Remove: Once valve service is complete, gradually release the air pressure from the hose. Disconnect the air hose and unscrew the air hold fitting from the spark plug port. Reinstall the spark plug.

BENEFITS OF USING LANG TOOLS AIR HOLD FITTING SET (901):

• Labor Savings: Eliminates the need for complete cylinder head removal, reducing repair complexity and time.
• Cost Reduction: Avoids additional expenses tied to gasket replacements and reassembly.
• Damage Prevention: Minimizes the risk of damaging sensitive components like head gaskets and manifolds.
• Reliable Valve Security: Applies consistent air pressure to ensure valves remain seated during service.
• Accessibility: Makes advanced engine service more manageable for both professionals and skilled DIYers.

FEATURES:

• Allows valve service without engine disassembly.
• Directly applies air pressure to cylinders.
• Compatible with standard automotive spark plug threads (M14, M18).
• Facilitates valve seal and valve spring replacement.
• Connects to common workshop air supply systems.
• Helps prevent valves from dropping into the cylinder.