Compression test adapter

1. A compression tester adapter, comprising:

a generally cylindrical plug fitting, including a pilot segment, an external thread, a cylinder segment, a plug end and a gasket located between the external thread and the cylinder segment, wherein the gasket is mounted on a cylinder portion having about the same diameter as the pilot segment;

a connector fitting including an attachment interface; and

a hose attached to the plug fitting.

2. The compression tester adapter of claim 1 , wherein the external thread has a nominal diameter of 12 mm.

3. The compression tester adapter of claim 1 , wherein the plug fitting further includes the pilot segment near the plug end with a pilot diameter that is smaller than a cylinder segment diameter.

4. The compression tester adapter of claim 1 , wherein the plug fitting further includes a gasket seat between the cylinder segment and the external thread, the gasket seat having a diameter that is about the same as a flange diameter.

5. The compression tester adapter of claim 1 , wherein the plug fitting is configured to form a seal against a periphery of a tapered seat near an inner extreme of a spark plug socket in an internal combustion engine cylinder head.

6. The compression tester adapter of claim 1 , wherein the plug fitting further includes: a first tube end opposite the plug end, wherein the hose is attached to the plug fitting at the first tube end; and a first airway configured to allow fluid communication through the plug fitting between the plug end and the first tube end.

7. The compression tester adapter of claim 6 , wherein the plug fitting further includes an orifice at the plug end configured to provide access to the first airway.

8. The compression tester adapter of claim 6 , wherein the plug fitting further includes a hose connector at the first tube end configured to engage an inner surface of the hose, the hose connector including a tube segment with a straight knurl and an external serration profile segment.

9. The compression tester adapter of claim 6 , wherein the plug fitting further includes an opening at the first tube end providing access to the first airway, the opening being configured to allow fluid communication between the plug fitting and the hose.

10. The compression tester adapter of claim 1 , wherein the plug fitting further includes a rim segment with a rim diameter that is larger than a cylinder segment diameter.

11. The compression tester adapter of claim 1 , wherein the attachment interface includes a socket configured with an internal thread on an inner surface of the socket.

12. The compression tester adapter of claim 1 , wherein the connector fitting attachment interface is configured to engage a compression tester quick-disconnect coupling.

13. The compression tester adapter of claim 1 , further comprising: a first ferrule configured to engage an outer surface of the hose; and a second ferrule configured to engage the outer surface of the hose, wherein the first ferrule is crimped onto a first hose end of the plug fitting to affix the hose to the plug fitting, and the second ferrule is crimped onto a second hose end of the connector fitting to affix the hose to the connector fitting.

14. The compression tester adapter of claim 1 , wherein the plug fitting further includes:

an attachment end;

a tube end, wherein the hose is attached to the connector fitting at the tube end; and

an airway configured to allow fluid communication through the connector fitting between the attachment end and the tube end.

15. The compression tester adapter of claim 1 , wherein the connector fitting is generally cylindrical in shape and further includes:

a cylinder segment at the attachment end with an external diamond knurl;

a socket in the cylinder segment that opens into an airway;

an internal thread on an inner surface of the socket;

a hose connector at a tube end configured to engage an inner surface of the hose including a tube segment with a straight knurl and an external serration profile segment; and

an opening at the tube end providing access to the airway, the opening being configured to allow fluid communication between the connector fitting and the hose.

16. The compression tester adapter of claim 1 , wherein the hose further comprises a flexible tube, including: a first hose end; a second hose end; and a hollow central passage including a first opening at the first hose end and a second opening at the second hose end configured to provide fluid communication between the first hose end and the second hose end, wherein the first hose end is attached to the plug fitting and the second hose end is connected to the connector fitting, providing uninterrupted sealed fluid communication between the plug fitting and the connector fitting.

17. The compression tester adapter of claim 1 , wherein the hose further comprises at least one textile, metallic braid, and mesh reinforcement sleeve, wherein the braid or mesh is oriented on a bias.

18. The compression tester adapter of claim 1 , further comprising: a compression pressure gauge; and a spark plug hose connected to the attachment interface and to the compression pressure gauge.

19. A compression tester adapter, comprising:

means for engaging a threaded spark plug socket in an internal combustion engine cylinder head;

means for attaching a compression tester spark plug hose;

flexible means for transmitting a compressed gas;

means for affixing the flexible means for transmitting to the means for engaging;

means for affixing the flexible means for transmitting to the means for attaching, wherein the means for engaging is configured to engage an internal thread configured with a nominal diameter of 12 millimeters; and

means for creating a substantially airtight seal against a periphery of a tapered seat near a inner extreme of the spark plug socket, the means for creating a substantially air tight seal located between the means for engaging and the means for attaching,

wherein the means for creating a substantially airtight seal is mounted to a cylinder portion having substantially the same diameter as a pilot segment.

20. A method of adapting a compression tester spark plug hose for use with a spark plug socket, comprising:

engaging a threaded spark plug socket in an internal combustion engine cylinder head;

attaching a compression tester spark plug hose;

transmitting a compressed gas to the compression tester spark plug hose, wherein the spark plug socket thread is configured with a nominal diameter of 12 millimeters; and

creating a substantially airtight seal using a gasket, against a periphery of a tapered seat near an inner extreme of the spark plug socket wherein the gasket is located on a cylinder portion haying substantially the same diameter as a pilot segment between the thread and a cylinder segment of the socket.