WEICHAI WD10 Service Manual - page 54
Service Manual for WD10 Diesel Engine
44
details). Besides, for engine with EVB oil pipe, the pipe need to be remove too. Disassembling of
other parts is as follows:
(1) Remove cylinder cover auxiliary nuts, and take down the clamp blocks, there are two kinds of
clamp blocks: one is installed between two adjacent cylinder covers, the other is installed on
two sides;
(2) Remove cylinder cover main bolts;
(3) Remove injector, due to injector nozzle is above cylinder cover base plane, he injectors must be
removed in advance to prevent the cover crashing the injectors during removal;
(4) Remove cylinder cover, 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;
(5) 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;
(6) If cylinder cover auxiliary bolts need to be replaced or checked, then remove the bolts;
(7) Remove rocker seat, intake valve and exhaust valve (refer to 45 Valve Mechanism)
(8) If the valve rod seal cartridge needs to be checked or replaced, then disassemble the seal
cartridge with dedicated tool, or clamp the seal cartridge lateral wall with a plier, and rotate to
take it out upward, removed seal cartridge cannot be reused.
4263 Inspection and Maintenance of Cylinder Cover
(1) Check the cylinder cover for water leakage, oil leakage, air leakage and other abnormal
phenomenon before disassembling, if there is such problem, replace cylinder cover gasket to
see whether the problem is solved, refer to this section for cylinder cover gasket disassembling
method.
(2) Check the cylinder cover appearance for discoloration and crack, if crack is discovered, liquid
penetrant test should be done.
(3) Check valve recession before disassembling valve mechanism. 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. 4-8.