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JB/T 12655-2016Diesel engines - Durability tests - Measurement methods for friction pairs (English PDF)

柴油机耐久试验摩擦副测量方法

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

January 15, 2016

Implementation date

June 1, 2016

Scope

JB/T 12655-2016 is the English-translated version of 柴油机耐久试验摩擦副测量方法.

JB/T 12655-2016 is a recommended Chinese machinery industry standard on the measurement of friction pairs in the durability testing of diesel engines. It specifies the key dimensions of the main friction parts to be taken before and after the durability test.

It serves the assessment of wear on the main friction parts of a diesel engine, and the wear of the main friction parts of other internal combustion engines may be assessed by reference to it.

Among the standards it quotes are GB/T 307.2-2005, GB/T 1149.5, GB/T 6809.2-2013, GB/T 6809.3-2013, GB/T 18779.1 and GB/T 19001-2008. It is filed under J92, with the ICS code 27.020.

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Document preview — JB/T 12655-2016

National Standard of the People's Republic of China

ICS: 27.020

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

1 Scope
2 Normative references
3 Terms and definitions
4 Classification of the friction pairs
5 General
5.1 Cleaning of the parts and components
5.2 Inspection of the appearance
5.3 Environmental conditions and conditioning
5.4 Instruments and gauges
6 Measuring methods
6.1 Inner diameter of the cylinder liner
6.2 Outer diameter of the piston
6.3 Gap of the piston ring at the joint
6.4 Outer diameter of the main journal of the crankshaft
6.5 Outer diameter of the crankpin of the crankshaft
6.6 Inner diameter of the main bearing
6.7 Inner diameter of the connecting rod bearing
6.8 Outer diameter of the piston pin
6.9 Outer diameter of the support journal of the camshaft
6.10 Dimensions of the cam lobe
6.11 Inner diameter of the bearing of the support journal of the camshaft
7 Data processing
Annex A (normative) Measurement record form of the cylinder liner
Annex B (normative) Measurement record form of the piston
Annex C (normative) Measurement record form of the piston ring
Annex D (informative) Measurement record form of the other parts and components
Figure 1 Measuring directions of the inner diameter of the cylinder liner
Figure 2 Measuring positions of the inner diameter of the cylinder liner
Figure 3 Measuring positions of the piston
Figure 4 Measuring positions and directions of the main journal of the crankshaft
Figure 5 Measuring positions and directions of the crankpin of the crankshaft
Figure 6 Measuring positions and directions of the big end and small end bearings of the connecting rod
Figure 7 Measuring positions and directions of the piston pin
Figure 8 Measuring positions and directions of the support journal of the camshaft and of the cam
Table 1 Friction pairs and their component parts

What this standard covers

This standard specifies the key dimensions of the main friction parts before and after the durability test of the diesel engine. This standard is applicable to the evaluation of the wear of the main friction parts of the diesel engine. The evaluation of the wear of the main friction parts of other internal combustion engines can also be carried out with reference to the implementation.

Document data

International classification (ICS): 27.020.

Chinese classification (CCS): J92.

Estimated length of the Chinese original: 17,110 words.

Standards quoted by this document

GB/T 307.2-2005; GB/T 1149.5; GB/T 6809.2-2013; GB/T 6809.3-2013; GB/T 18779.1; GB/T 18779.2; GB/T 18779.3; GB/T 19001-2008

3 Terms and definitions

4 Classification of the friction pairs

5 General

6 Measuring methods

7 Data processing

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

JB/T 4198.3-2020|JB/T 13714-2019|JB/T 13717-2019|JB/T 13502-2018|JB/T 14226-2022|GB 45841-2025

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