QC/T 1139-2020 PDF English
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Technical Specifications for Remanufactured Automotive Components - Connecting Rod
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QC/T 1139-2020: PDF in English (QCT 1139-2020) QC/T 1139-2020
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.060.10
T 12
Technical Specifications for Remanufactured
Automotive Components – Connecting Rod
ISSUED ON: DECEMBER 09, 2020
IMPLEMENTED ON: APRIL 01, 2021
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword...6
1 Scope...7
2 Normative References... 7
3 Terms and Definitions...8
4 Process Requirements...8
5 Performance Requirements... 11
6 Test Methods... 13
7 Inspection Rules... 13
8 Marking, Packaging, Transportation and Storage... 14
Appendix A (Informative) Production Process of Auto Parts Remanufactured
Products...16
Technical Specifications for Remanufactured
Automotive Components – Connecting Rod
1 Scope
This Document specifies the terms and definitions, process requirements,
performance requirements, test methods, inspection rules, markings, packaging,
transportation and storage of remanufactured products of automobile engine
connecting rods.
This Document is applicable to remanufactured products of automobile engine
connecting rods.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) is applicable to this document.
GB/T 1958 Geometrical Product Specifications (GPS) - Geometrical Tolerance -
Verification Prescription
GB/T 6809.3 Reciprocating Internal Combustion Engines - Vocabulary of
Components and Systems - Part 3: Main Running Gear
GB 22128 Reciprocating Internal Combustion Engines - Vocabulary of
Components and Systems - Part 3: Main Running Gear
GB/T 26989 Automobile Recovery - Terminology
GB/T 28675 Remanufacturing of Automotive Components - Disassembly
GB/T 28676-2012 Remanufacturing of Automotive Components - Classification
GB/T 28677 Remanufacturing of Automotive Components - Cleaning
GB/T 28678 Remanufacturing of Automotive Components - Pre-Delivery
Inspection
4.1.2 The production process of the remanufactured products can refer to Figure A.1.
4.2 Disassembly requirements
4.2.1 The disassembly of the connecting rod shall comply with the requirements of
GB/T 28675.
4.2.2 The connecting rod shall be disassembled into connecting rod body, connecting
rod cover, connecting rod bolt and small end bushing. Except for connecting rod body
and connecting rod cover, the remaining parts shall be discarded.
4.2.3 When removing the connecting rod bushing, no scratches or other damages
shall be made to the installation hole.
4.2.4 Group and mark according to quality matching. Marking positions and
numbering rules should meet the requirements of original product design or
remanufactured product technical documents.
4.3 Cleaning requirements
After disassembly, the cleaning of the connecting rod shall comply with the provisions
of GB/T 28677; and the oil dirt and sediment in the oil passage shall be thoroughly
removed.
4.4 Testing and classification requirements
4.4.1 Testing requirements
4.4.1.1 The connecting rod shall be free of cracks.
4.4.1.2 The large-end threaded hole of the connecting rod shall be visually inspected
without damage. If necessary, a special inspection tool may be used for inspection.
4.4.1.3 The connecting rod shall be tested for geometric tolerances to meet the
requirements specified in the technical documents of the remanufacturing enterprise.
4.4.1.4 After re-tightening the torque according to the original product technical
documents, the flatness of both sides of the connecting rod large-end hole shall be no
greater than 0.1mm.
4.4.2 Classification requirements
4.4.2.1 The classification of old connecting rods after dismantling shall comply with
the provisions of GB/T 28676.
4.4.2.2 Old connecting rods that meet the following conditions can be remanufactured,
otherwise they shall be discarded:
a) There is no crack in the connecting rod body and the connecting rod cover;
b) There is no damage to the large-end threaded hole of the connecting rod;
c) The connecting rod shall have no warpage and deformation, and the flatness of
the side surface shall be less than 0.1mm.
4.5 Repair requirements
4.5.1 Repair of end face
After re-tightening the torque according to the original product technical document,
the end face of the connecting rod shaft hole is used as the positioning reference; and
the two ends of the connecting rod are processed and levelled. The maximum
allowable processing on one side is 0.05mm.
4.5.2 Repair of large end holes
If the size and geometric dimensions of the connecting rod large end hole exceed the
allowable tolerance range, the following methods or other methods can be used to
repair:
a) When the mating surfaces of the connecting rod body and the connecting rod
cover are flat, a small amount of the mating surface materials of the connecting
rod body and the connecting rod cover are removed, and the connecting rod
bolts are tightened to a certain torque value according to the provisions of the
remanufactured product technical documents. The large end hole of the
connecting rod is machined to meet the requirements for technical document of
the remanufactured product;
b) When the mating surface of the connecting rod body and the connecting rod
cover is a special-shaped surface, increase the large end hole of the connecting
rod and use a special thick bearing bush, or use electric brush plating, metal
spraying, etc. to add materials; the connecting rod bolts are tightened to a
certain torque value according to the provisions of the remanufactured product
technical documents. The large end hole of the connecting rod is machined to
meet the requirements for technical document of the remanufactured product.
4.5.3 Repair of small end hole
4.5.3.1 The matching tolerances of the connecting rod small end hole and the
connecting rod small end bushing shall meet the requirements of the technical
document of the remanufactured product.
4.5.3.2 The small end bushing of the connecting rod shall be installed in the same way
as the new connecting rod, and the installed small end bushing of connecting rod shall
6 Test Methods
6.1 Surface roughness
The surface roughness can be measured by a surface roughness meter, and the
surface roughness can also be measured by other methods.
6.2 Size tolerance
6.2.1 Use an inner diameter dial gauge or other measuring instrument to measure the
size tolerance of the large end hole of the connecting rod.
6.2.2 Use a four-equivalent gauge block, a dial indicator and a height gauge or other
special inspection tools on the flat plate to measure the centre distance of the large
and small head holes.
6.3 Shape and position tolerance
The shape and position tolerances of each processing part on the remanufactured
connecting rod shall be tested according to the provisions of GB/T 1958.
6.4 Magnetic particle inspection
Test the remanufactured connecting rod according to the method in JB/T 6721.2.
7 Inspection Rules
7.1 Exit-factory inspection
The exit-factory inspection of remanufactured connecting rods shall comply with
provisions of GB/T 28678.
7.2 Type inspection
Type inspection shall be carried out when there is one of the following conditions:
a) When a new product is trial-formed or an old product is transferred to other
factory for trial-formulation;
b) When major changes in structure, materials or processes may affect product
performance;
c) When production resumes after 1 year of suspension;
d) Every 3 years of normal production;
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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