Tool and method for removal of an oil filter cartridge cap from marine and automotive engines

A tool for removing an oil filter cartridge cap from an engine, the cartridge cap adapted for attaching to said engine by a threaded nipple and having a plurality of spaced first holes arrayed around the circumference of a first circle having a first pre-determined radius, said circle concentric with said nipple, which tool comprises:

• (a) a selected base disk of finite thickness, having a central axis, and having at least two spaced first pins secured to one face of the base disk and projecting from said base disk to extend away therefrom, said first pins terminating in free outer ends arrayed around the circumference of a second circle of said first pre-determined radius centered on said axis and adapted to engage said first holes, said base disk also having at least two spaced second holes in a second face of said base disk extending into the thickness of said disk, said second holes arrayed around the circumference of a third circle of a second radius centered on said axis;
• (b) a drive disk having a finite thickness, having a central axis, and having at least two spaced second pins secured to one face of the drive disk and projecting from said drive disk to extend away therefrom, said second pins terminating in free outer ends arrayed around the circumference of a fourth circle of said second radius centered on said drive disk, said drive disk may be cooperatively coupled with said selected base disk by said second pins engaging said second holes, said drive disk also adapted to receive a wrench to forcibly rotate said drive disk;
• wherein, in use, said selected base disk is coupled with said drive disk and thereby with said wrench engaging said drive disk, and said first pins are engaged with said first holes of said filter cartridge cap, thereby to transfer torque from said wrench through said coupled disks to said oil filter cartridge cap to unscrew the oil filter cartridge cap from the engine.