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3-3-8-obrabotka-golovki-cilindrov-klapanov.html
3.3.8. Processing of a head of cylinders / valvesSaddles of valves with wear tracks and an obgoraniye can be processed, with preservation of adjustment corners and width of a saddle. Otherwise the head of cylinders has to be replaced. Always process saddles of valves before achievement of a faultless type of a working surface. The saddle of the valve can be replaced by means of the ordinary press equipment of a workshop. For processing the mill is necessary for a valve saddle. Since the handling of this tool demands special experience, this work has to be performed in a workshop.
Check of a type of a working surface of a plate of the valve
| PERFORMANCE ORDER |
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1. The contact surface of a facet of the valve (1) has to be in the middle of the plate width of the valve and pass evenly on all circle. |
| 2. If the plate thickness of the valve (2) is lower than limit of wear (boundary value), replace the valve. |
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Amount of processing of a head of cylinders
If deformation of a sealing surface exceeds extreme value of 0,1 mm, it is necessary to process a sealing surface of a head of cylinders.
Height of a new head of cylinders: 137,9–138,1 mm.
Prevention
The head of cylinders and the block of the engine, can be processed in the sum as much as possible on 0,2 mm.
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