JB/T 97661-1999 This standard is a revision of ZB J92 008-88 "Technical Conditions for Cast Iron Cylinder Heads for Diesel Engines". During the revision, only editorial changes were made in accordance with relevant regulations, and the main technical content remained unchanged. This standard specifies the technical requirements, inspection methods, inspection rules and marking, packaging, transportation and storage of cast iron cylinder heads for internal combustion engines. This standard is applicable to cast iron cylinder heads for reciprocating internal combustion engines with a cylinder diameter less than or equal to 200mm. This standard was first issued in 1975 and revised for the first time in 1988. JB/T 9766-1999 Technical Conditions for Cast Iron Cylinder Heads for Internal Combustion Engines JB/T9766-1999 Standard download decompression password: www.bzxz.net

[CS27.020
Machinery Industry Standard of the People's Republic of China
JB/T9766-1999
Internal combustion engines Cast iron cylinder heads-Specifications
1999-09-17 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JR./T9766-1999
This standard is a revision of ZBJ92008-88 Diesel Engine Cast Cylinder Head Technical Specifications. Editorial modifications were made to the original standard during the revision: the main technical content has not changed. This standard will replace 7.8J92008-88 from now on. This standard was proposed and submitted by the Quanzhou Internal Combustion Engine Standardization Technical Committee. The drafting unit of this standard is Tuhai Internal Combustion Engine Research Institute. The main initiator of this standard is Li Shaozhuang. This standard was first issued in 1975 and revised for the first time in 1988. Scope: Mechanical Industry Standard of the People's Republic of China Internal Combustion Engine: Cast Iron Cylinder Head Technical Conditions Internal Combustion Engines Cast Iron Cylinder Heat-Sperifteatlons JB/T9766—1999 Replaced by ZBJ92008-88 This standard specifies the connection technical requirements, inspection methods, inspection rules and markings, packaging, transportation and storage of cast iron cylinder heads for internal combustion engines. This standard is applicable to cast iron cylinder heads for conventional internal combustion engines with a cylinder diameter of less than or equal to 200\m (hereinafter referred to as cylinder heads). 2 Referenced Standards The following standards contain new or omitted provisions, which constitute the provisions of this standard by using them in the relevant standards. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision. When using this standard, the possibility of using the latest versions of the following standards should be considered. GB191—1990
GB/T 197—[981
G8/T[84—1996
G—9?
GE28281987
JB/T 97A2-1999bzxZ.net
3 Technical requirements
Packing, storage and transportation identification
Ordinary screw tolerances and fits (diameter 1~355mm) Shape and position tolerances without specified values
Tolerances and fits Size mm 500 mm Hole, shaft tolerance zone and fit Batch-by-batch inspection Count sampling procedures and sampling tables (applicable to continuous batch inspection) Internal combustion engine gray iron cylinder head and engine body express delivery·Technical conditions 3.! The cylinder head shall comply with the provisions of this standard and be manufactured according to the product drawings and technical documents approved through the prescribed procedures. 3.2 The material and allowable defects of the cylinder head shall comply with the provisions of JT9742. 3.3 The tolerance zone of the main parts of the cylinder, the form and position tolerance and the surface roughness 3.31 Tolerance zone
) The tolerance zone of the valve guide hole is H7 in BT1801-1S79: b】Valve! The tolerance zone of the seat ring hole is H7 in GB/T1801-1979; c) The tolerance zone of the crankshaft seat, injector, inlet and outlet pipes, water outlet and glow plug is 6H in GB/T197-1981. 3.3.7 Shape and position tolerances a) The flatness of the bottom (the plane combined with the engine body) is grade 8 in Table B3 of GB/T1184-1996; ] The parallelism of the top (the plane combined with the valve cover shell) to the bottom surface is grade B in Table 3 of GB/1184-1996; c) The verticality of the valve guide hole to the bottom surface is 100:0.10; ) After the valve guide and valve seat ring are pressed into the cylinder head, the coaxiality of the seat cone shaft to the guide shaft is GB/T197-1981. 184-1996 National Machinery Industry Bureau approved on September 17, 2000-01-01 implementation
9 levels in Table B4,
3.3.3 Roughness
JB/T9766-1999
) The maximum allowable value of the surface roughness of the bottom surface, valve guide hole, valve seat ring hole is: 6) The maximum allowable value of the surface roughness of the top surface, oil plate body, and combustion chamber hole is R, which is 3.2μm:) The maximum allowable value of the surface roughness of the combined plane of the inlet, exhaust pipe, and outlet pipe is R 6.3μm. d) Valve seat cone surface: Before grinding, the maximum allowable value is 0.8; after grinding, the maximum allowable value R is 0.4μm. 3.4 The cylinder head shall be tested by water or air pressure at a pressure of 40MPa for 2 minutes. It shall not be replaced completely. 3.5 The unprocessed outer surface of the cylinder head shall be painted. The brand and color shall be in accordance with the product sample regulations. The warranty period of the cylinder head shall not be less than the warranty period of the internal combustion engine. 3.6
4 Inspection rules
4. The cylinder head shall be inspected and qualified by the technical inspection department of the manufacturer and a product certificate shall be issued by the Xinengshan Factory. 4. The cylinder head should be analyzed regularly to check the inner cavity. 4.3 When the ordering unit randomly checks the cylinder, it should be selected according to GB/T2828. The specific details shall be agreed upon by the ordering unit and the manufacturer: 5 Marking, packaging, transportation, storage
5. 1 The cylinder head should be marked with:
) Manufacturer name or factory logo:
6) Part number:
Manufacturing approval number
The location, size and method of marking shall be as specified in the product drawing. 5.2 The cylinder head shall have a product certificate signed by the inspector. The certificate shall indicate: a) the name, factory mark and address of the manufacturer; b) the model of the internal combustion engine, the name of the parts and the part number; c) the date of inspection; 5.3 The outer surface of the packaging box shall indicate: a) the name, factory mark and address of the manufacturer; b) the model of the internal combustion engine and the name of the parts; c) the date of packing, gross weight and quantity; d) the address of the receiving unit. 5.4 The packaging mark shall be in accordance with the relevant provisions of GB191. The paint and ink of different colors shall be correctly selected and used, and accurately marked on the box surface. 5. After the cylinder head is manufactured into a finished product, it must be disinfected and rust-proofed before it can be packaged. The packaging shall also have rainproof measures to ensure that the cylinder head is not damaged during storage and transportation. Special requirements can be agreed upon by the ordering unit and the manufacturer. 5. After packaging, the cylinders should be stored in a ventilated, dry and corrosive-free warehouse. Under the correct storage conditions, the manufacturer should ensure that the cylinders will not rust within 12 months from the date of shipment.
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