Copper Spark Plug Gasket – 18mm | MS17840-1

The MS17840-1 is an 18mm copper crush gasket used with aviation spark plugs in certified piston aircraft engines.

This gasket provides proper sealing between the spark plug and cylinder head, ensuring correct compression retention and preventing combustion gas leakage when installed and torqued according to manufacturer specifications.

MS17840-1 gaskets are typically replaced whenever a spark plug is removed during inspection or maintenance.

Key Features

• Part Number: MS17840-1

• 18mm internal diameter

• Copper crush washer design

• Designed for aviation spark plug applications

• Replaced during routine ignition maintenance

• Sold individually

Typical Applications

Commonly used with:

• Champion aviation spark plugs (18mm thread)

• Tempest aviation spark plugs (18mm thread)

• Lycoming piston engines

• Continental piston engines