Water cooled spark plug and spark plug sleeve

Abstract

An insert 22 for a water cooled spark plug sleeve 12 of a combustion engine comprises a longitudinal body having an outer wall 28. The outer wall defines an inner cavity to removably accommodate a spark plug 10. The longitudinal body is movably arranged within the spark plug sleeve between a first position sealing a radial opening 38 of the spark plug sleeve and a second position providing a fluid communication between the radial opening and an end portion 16 of the spark plug. The radial opening may be sealed by a portion of the outer wall in the first position, and the outer wall may comprises a radial through-hole aligned with the radial opening in the second position, where the radial through-hole provides a fluid communication between the radial opening and the inner cavity. The longitudinal body may transition between the first position and the second position by rotation or by longitudinal translation. The longitudinal body may comprise an inner wall 30 connected to the outer wall via a bottom portion of the longitudinal body, the inner wall radially and longitudinally delimiting the inner cavity forming a reservoir 32, where the bottom portion comprises a selectively closable bore 34.

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