Mon-Fri 8am-5pm PST Live Customer Service & Technical Support
888-800-9629
(0) $0.00 (US)
|
BoschSparkPlugs.net is part of the SparkPlugs.com family - an authorized Bosch distributor. To contact Bosch USA, click here.
Learning Center
Share |

Tapered vs. Gasket Seat

Spark Plug Seat

A spark plugs seat creates a seal to the combustion chamber.

There are two seat types available: flat and tapered.



WARNING: Spark plugs with different seat types are NOT interchangeable.

   *Spark plugs with a flat seat must be used in engines designed for a gasket seal. 

   *Spark plugs with a tapered seat must be used in engines designed for a tapered seal.

Flat Seat

Plugs with a flat seat use a crushable gasket to create a seal between the plug and combustion chamber.

 

All spark plugs with a flat seat should include a gasket on the plug, or in the box. Replacement gaskets can be purchased, and should be replaced every time a plug is re-installed.

Gasket

As the plug is installed, the gasket starts to meet with the flat face of the cylinder head. Once a plug is hand tightened, torquing (to the proper specifications for your engine) as the final step in the installation process will help ensure the gasket is crushed and has created a tight seal between the plug and combustion chamber.

Plug manufacturers recommend the use of a new gasket any time a plug is re-installed after inspection.

 

 Gasket crushing in chamberWasher Crushing in Chamber

 

Tapered Seat

 

Plugs with a tapered seat use the plugs outer shell to create a seal between the plug and combustion chamber.

Tapered Seat in Chamber

questions?
call us (888-800-9629)
LOOKING FOR WHOLESALE PRICING? Contact Us for Quotes
SPARKPLUGS.COM
PO Box 772
Sun City, CA 92586
CUSTOMER SERVICE
Toll Free: 888-800-9629
Out of U.S call 951-672-8501