Valve lash adjusting tool and method therefor
US3988925A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1975 |
| Grant date | Nov 2, 1976 |
| Priority date | — |
| Expiry date | Nov 21, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2303/01
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tool and method for automatically adjusting internal combustion engine valve lash is disclosed. The engine is first rotated to correctly position the valve lifter cam for the individual valve which is to be adjusted. The novel tool of this invention is then positioned and sequenced through a series of operations which properly set the valve lash or preload, whichever is required. The system uses a linear variable differential transformer probe in the preferred embodiment to establish when the valve is seated. The valve lash adjusting means is advanced until the rocker arm engages the valve stem. The initial movement of the valve stem is sensed by a linear variable differential transformer and a zero reference is established at the point where the valve just begins to move. The valve lash adjusting means is then rotated out until the valve stem returns to the established zero position at which point the valve lash adjusting means is further rotated out a specified number of degrees which, utilizing the adjusting means as a micrometer, accurately sets the required valve lash.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.