Patent ID: 7581433
Filing Date: 2009-09-01
Classification: G01M

Abstract:
1. Apparatus for detecting cylinder leaks allowing more than a predetermined maximum volume of pressurized gas to leak from a cylinder in an internal combustion engine, comprising: a hose having a first end configured to be held by manual pressure by a user in sealing position in communication with a spark plug hole connecting to the cylinder to be tested wherein build up of pressurized gas in the cylinder will act against the manual pressure applied by the user to hold the end in the spark plug hole, and a second end configured for attachment to a source of pressurized gas pressurized to a pressure that will require noticeable force by a user to hold the end in place in the spark plug hole if such pressure builds up within the cylinder; and an orifice positioned between the first and second ends with no flow connections between the orifice and first end, said orifice positioned to limit flow of pressurized gas from the source of pressurized gas into the cylinder to be tested when the second end of the hose is connected to a source of pressurized gas, said orifice limiting the flow of pressurized gas to an amount about equal to the predetermined maximum allowable leakage, leakage more than the predetermine maximum being determined by a lack of pressure build up in the cylinder while leakage less than the predetermined maximum being determined by a build up of pressure in the cylinder which is determined by the user noticing that force is required to hold the first end in the spark plug hole.