WEICHAI & PSI SERVICE MANUALS AVAILABLE ONLINE AT FLYPARTSGUY.COM Weichai America Corp. 3. Clearance between valve rod and valve guide pipe: Internal surface of valve guide pipe is the contacting surface between valve rod and valve guide pipe, if clearance between valve rod and valve guide pipe exceeds allowed value due to abrasion, then the guide effect will at state, which may affect reliability of the engine. The inner diameter of guide pipe can be measured with an inside micrometer, as shown in Fig. 3- 5. Outer diameter of valve rod can be measured with an outside micrometer.
Both allowed ranges for clearance between intake valve rod and its guide pipe, exhaust valve rod and its guide pipe are 0.03~0.06mm. If clearance exceeds allowed range, the cylinder cover must be replaced to ensure reliability of diesel engine. Fig. 9-8 4. Cylinder head gasket: If there is air leakage, water leakage or oil leakage in cylinder head gasket, then the gasket should be checked and replaced; Check the gasket for visible damage and analyze the cause, cylinder cover gaskets are disposable, and should be replaced during maintenance. 9.6 Assembly and disassembly of valve 9.6.1 Exploded view of valve Revision:
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