Firing deck insert for IC engine - has circular plate insert with externally threaded boss providing axial location whilst permitting thermal expansion

摘要

The internal combustion engine includes a coolant jacketed body surrounding a combustion cylinder with a tubular wall extending through the coolant jacket and surrounding an ignition device exposed through a firing deck area to the cylinder. A circular recess axially of the ignition device encompasses the firing deck area with an axially disposed, internally threaded bore extending from the recess into the tubular wall. A circular plate insert has an axially disposed, externally threaded boss threadab le into the bore to axially secure the insert within the recess. The dia. of the insert is less than the dia. of the recess to enable expansion by heat absorption of the insert independently of and without transmitting stress and strain to the engine body.