JB/T 9753-1999 This standard is a revision of NJ 424-86 "Technical Conditions for Cast Iron Blocks of Internal Combustion Engines". During the revision, only editorial changes were made according to relevant regulations, and the main technology remained unchanged. This standard specifies the technical requirements, inspection methods, inspection rules and markings, packaging, transportation and storage of cast iron blocks for internal combustion engines. This standard applies to cast iron blocks for reciprocating internal combustion engines with a cylinder diameter of less than or equal to 200mm. This standard was first issued in 1986. JB/T 9753-1999 Technical Conditions for Cast Iron Blocks of Internal Combustion Engines JB/T9753-1999 Standard download decompression password: www.bzxz.net

1CS 27. 020
Machinery Industry Standard of the People's Republic of China
JB/T 9753--1999
Internal combustion engines--Cast iron cylinder blocksSpecificatiors
1999-09-17 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JB/E9753-1999
This standard is a revision of NJ424-%6 "Technical Conditions for Cast Iron Cylinder Blocks of Internal Combustion Engines". The original standard has been revised and edited, and the main technical content has not changed.
This standard replaces NJ424-86 from the date of implementation. This standard was proposed and issued by the National Technical Committee for Standardization of Internal Combustion Engines. This standard was drafted by: Wujin Diesel Engine Body Factory, Shanghai Internal Combustion Engine Research Institute. The main contributors to this standard: Shi Fang, Zhu Yadao, Li Shaocai. This standard was first issued in 1986.
Machinery Industry Standard of the People's Republic of China
Technical Conditions for Cast Iron Body of Internal Combustion Engines
Inlerual combustin engines-Castiron cyliader blncksSpeetfleatloas
JR/T9753—1949
Dai Sa NJ424·B6
This standard specifies the technical requirements, inspection and repair methods, inspection rules and markings, packaging, transportation, etc. for iron body of internal combustion engines. This standard applies to iron body of reciprocating internal combustion engines with cylinder diameter less than or equal to 2m. Referenced Standards
The provisions contained in the following standards constitute the recommended text of this standard through reference in this standard. When this standard is revised, the version shown is valid. All standard deviations will be revised. Parts using this standard should explore the possibility of using the new version of the following standard section. GB/T 10311995
GB/T1184—1996
Surface roughness index and its value
Form and position tolerances and standard deviations
Basis of limits and fits Part 3: Table of values ​​of standard tolerances and basic deviations GB/T1800.J—199B
GB/T 2828—1987
GB/T2820—1987
GB/T 10095—1588
JB/T9742-1999
3 Technical requirements
Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection) Periodic inspection counting sampling procedure and sampling table (applicable to the stability of the production process) Involute gear precision
Technical conditions for internal combustion engine gray cast iron cylinder head and body castings 3.1 The body is made according to the product drawings and technical documents of the specified batch. 3.2 The material of the casting and the allowable casting defects shall comply with the provisions of [H/T9742. 3.3 The size tolerance and cylindricity tolerance of the bearing hole, camshaft bearing hole and cylinder side hole shall comply with the provisions of GB/T13 and GB/T1184-1996 Table B2 respectively, see Table 1. Table 1
Main bearing hole
Convex and concave
Gas tolerance
Dimension tolerance grade
3.4 ​​The surface roughness of the machine body surface shall be in accordance with the provisions of GS/T1031., see Table 2.3.5 The surface roughness of the main body surface shall be in accordance with the provisions of Table B1 in GS/T1181--{996, see Table 3 State Machinery Industry Bureau approved the opening of the public old school grade on September 17, 1999
2000-01-01 implementation ||t t||3B/T9753—1999
3.6 The coaxiality of the bearing hole of the machine body should be in accordance with the provisions of B4 in GB/T1184—1996, see Table 43.7 The flatness and width of the machine body surface should be in accordance with the provisions of B3 in GB/T1184—1996, see Table 5, 3. The center distance of the transmission gear hole on the machine body should be in accordance with the provisions of B1005, 3. The machine should be subjected to a water pressure test with a pressure of 4MP and a time of 2m, and there should be no leakage. 3.1D The machine body should be treated by cleaning, especially the oil channel should not have iron eyebrows. All oil channel components should be subjected to an oil pressure test with a pressure of 490ka and a time of 1m. Use No. 20 engine oil or oil with viscosity equal to No. 20 engine sleeve. No leakage is allowed. Table 2
Air sleeve hole: Ten-way air-wet type:, Lower hole surface ~ door: to be cold/not to come
Main bearing hole
Bar bearing hole
Electric gear pump
Main bearing press surface and positioning surface
Air bag surface
Joint plane of machine body\air and blood
Front, rear and lower plane of machine body
Fitting plane of main bearing||tt| |Joint between engine body and gasket
Front and rear bearing surfaces of engine body
Lower relative surface of engine body
Mounting plane of each mesh
Coaxiality of each main bearing hole
Coaxiality of upper and lower positioning holes of gasket hole
Coaxiality of each camshaft bearing hole
Main thrust bearing hole axis line of main bearing hole
Metal surface roughness of cylinder bearing axis
Public grade
JE/T 9753—1999
10. Parallelism of bearing hole and cam bearing hole. Parallelism of main shaft hand hole axis and joint plane of engine body and cylinder. Verticality of camshaft bearing axis. Verticality of main shaft hand hole axis and joint plane of main bearing. Verticality of main shaft hand hole axis and joint plane of main bearing. Verticality of main shaft hand hole axis and joint plane of main bearing. 3.11. The unprocessed surface of engine body shall be painted continuously. The paint brand and color shall be in accordance with the product sample. 3.12. The warranty period of engine body shall not be less than the warranty period of internal combustion engine. 4. Acceptance rules
4.1 Engine body shall be inspected and qualified by the technical inspection department of the gas manufacturer before it can be shipped. 4.2: The manufacturer shall conduct regular random inspections on the engine. The inspection items are 3.2~3.10. Tolerances and other versions
4.3 When inspecting the quality of the machine, the sampling method can be carried out in accordance with the provisions of GB/T 2828 and GB/T 2829, or it can be decided by negotiation between the ordering unit and the manufacturer.
5 Marking, packaging, transportation, storage
5.1 The machine body should be marked with:
a) Manufacturer's name or trademark wwW.bzxz.Net
b) Diesel engine model and other parts number:
c) Main bearing matching cover mark; d) Manufacturing date or body number:
Marked position. Dimensions and methods are specified in the product drawings. 5.2 The body should have a product quality certificate signed by the manufacturer's inspector. The certificate should be marked with:) Manufacturer's name, factory mark and address:
b! Diesel engine model, parts name change parts: c) gun inspection date,
5.3 The outer surface of the packaging box is marked with:
) manufacturer name, factory logo and address;
h) diesel model and other parts name:
packing period, gross weight and quantity;
d) receiving unit and address:
e! 5.4 Before the machine is packed, it must be cleaned, oil-sealed or treated with other anti-corrosion measures, and then packed in a dry packaging box with waterproof paper to ensure that the parts will not be damaged during transportation. 5.5 The machine should be stored in a ventilated and dry warehouse. Under normal maintenance conditions, the manufacturer should ensure that the machine body will not rust within 12 months from the date of leaving the factory.
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