Porsche automobile oil drain replacement tube
OwnerJohn C. De Bonisinventor
Life of this patent
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Abstract
A replacement oil drain tube for interconnecting the head and crankcase on a Porsche automobile engine permits the repair of such engines through a replacement of standard, single piece oil drain tubes with a telescoping oil drain tube assembly, eliminating the requirement that the cylinder head be removed from the engine for such repair.
Claims6
A replacement oil drain tube for use in interconnecting the aperture on the cylinder head of a Porsche automobile engine with the aperture on the crankcase thereof, each of said apertures including a larger diameter external tubular section separated by a shoulder from a smaller diameter internal tubular section, said apertures being axially aligned but being subject to substantial misalignment during temperature fluctuations of said engine, comprising:
- a main tube having sufficient length to span the distance between said larger diameter sections, a large end located within said larger diameter section of one of said apertures, and a small end centered within said larger diameter section of the other of said apertures;
- a telescoping sleeve surrounding a portion of the length of said main tube adjacent said small end thereof, said telescoping sleeve located within said larger diameter section of the other of said apertures;
- a sealing member positioned on said small end of said main tube, said member sealingly engaging said main tube and said telescoping sleeve;
- means for locking said telescoping sleeve in place on said main tube to prohibit inward axial movement of said small end of said main tube relative said telescoping sleeve;
- said large end and said telescoping sleeve having larger outside diameters than the inside diameter of said smaller diameter internal tubular sections, but smaller outside diameters than said larger diameter internal tubular sections to permit cocking of said large end of said sleeve within said larger diameter internal tubular sections;
- and
- a pair of resilient O-rings, one positioned between said larger end and said larger diameter section of said one of said apertures, the other positioned between said telescoping sleeve and said larger diameter section of said other of said apertures, said locking means, abuttment of the end of said tube and said telescoping sleeve with said smaller diameter internal tubular sections and frictional engagement of said O-rings forming the sole means of attaching said replacement drain tube to said engine, said O-rings and said sealing member sealing said tube to said cylinder head and said crankcase during said substantial misalignment.
A method of replacing an oil drain tube in a Porsche automobile engine to interconnect the aperture on the cylinder head thereof with the aperture on the crankcase thereof, each of said apertures including a larger diameter external tubular section separated by a shoulder from the smaller diameter internal tubular section, said apertures being axially aligned but being subject to substantial misalignment during temperature fluctuations of said engine, with a replacement oil drain tube having a main tube of sufficient length to span the distance between said larger diameter sections, a large end, a small end, a telescoping sleeve slideable on said main tube for selectively increasing the diameter of said small end, a sealing member positioned on said small end of said drain tube to sealingly engage said telescoping sleeve, and means for locking said telescoping sleeve on said main tube, said large end and said telescoping sleeve having smaller outside diameters than said larger diameter tubular sections and being fitted with O-rings seals having larger outside diameters than said larger diameter tubular sections, comprising:
- inserting said small end into said smaller diameter internal tubular section of one of said apertures while canting said replacement tube so that said large end clears the other of said apertures, all while said telescoping sleeve is spaced from said small end;
- aligning the axis of said replacement oil drain tube with said apertures;
- inserting said large end into the larger diameter external tubular section of the other of said apertures to seal said O-ring against said larger diameter tubular section while withdrawing said small end from said smaller diameter section of said one of said apertures to a position within the larger diameter section of said one of said apertures;
- sliding said telescoping sleeve on said main tube to increase the diameter of said small end and engage said sealing member between said telescoping sleeve and said main tube to seal said members, while placing said O-ring on said telescoping sleeve in sealing engagement with the larger diameter section of said one of said apertures;
- and
- locking said telescoping sleeve in place on said main tube after sliding said telescoping sleeve to prohibit inward axial movement of said small end of said main tube relative said telescoping sleeve, said sliding and locking steps providing an oil drain tube which is solely resiliently supported by said O-rings and said sealing member and which is limited as to axial movement by said smaller diameter tubular sections and said locking means.
Dependencies are inferred from the claim text.