SDLG WP6, Руководство по обслуживанию

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Service Manual for WP6 Diesel Engine
31
prevent the cover crashing the injectors during removal), do not waggle the cover during
removal, otherwise remnant coolant may outflow. If cylinder cover gasket is attached on the
removed cylinder cover, take it down and put it back on engine block;
(5) Put the removed cylinder cover on paper board to prevent wearing upper surface of combustion
chamber and other sealing surfaces. If more than one cylinder cover needs to be disassembled,
then it is required to mark the cylinder number on the cover for fault analysis;
(6) Remove cylinder cover gasket, if more than one cylinder cover gasket needs to be disassembled,
then it is required to mark the cylinder number on the gaskets for fault analysis;
(7) Remove intake and exhaust valve module, refer to disassembly of valve mechanism for details;
(8) Remove valve rod seal carriage.
3233 Inspection and Maintenance of Cylinder Cover
Check the cylinder cover for water leakage, oil leakage, air leakage and other abnormal
phenomenon before disassembling, so as to locate and analyze the problem correctly.
Clean cylinder cover, focus on combustion chamber surface, valve seat, intake and exhaust valve,
intake and exhaust passage, remove the carbon deposit and mucilage glue, and check the surface
condition.
(1) Appearance inspection
Check the cylinder cover for discoloration and crack, if crack is discovered, liquid penetrant test
should be done.
(2) Valve recession
Valve recession is the vertical distance between valve undersurface and cylinder cover undersurface,
the difference between measured value and required value of valve recession can reflect wear
degree of valve and valve seat. A depth micrometer can be used to measure valve recession, as
shown in Fig. 3-4.
Fig. 3-4