Method and apparatus for testing piston rings
US5633459A · kind A · utility
Inventor
Key dates
| Filing date | Feb 29, 1996 |
| Grant date | May 27, 1997 |
| Priority date | — |
| Expiry date | Feb 29, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M13/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Piston rings are tested for their effectiveness by removing the cylinder heads of an engine, and sealing one cylinder with a pressure cap. Fluid under pressure is admitted into the cylinder, and time required to dissipate the pressure is monitored. A long time to dissipate the pressure indicates good rings, and a short time indicates bad rings. The several cylinders are sealed an tested one at a time. The pressure cap has a tire valve therein so the conventional air hose can be used to pressurize the cylinder. Preferably, engine oil is placed into the cylinder before the pressure cap is put into place so it is the oil that must move past the piston rings. A hold-down for the pressure cap may be fixed to the engine block using a screw into one of the holes for the cylinder head screws.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.