QC/T 771-2017 English PDF (QCT771-2017)

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QC/T 771-2017: Specifications of diesel-fuel fine filter assembly with paper element for automotive diesels
QC/T 771-2017
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.060.40
T 13
Replacing QC/T 771-2006
Specifications of Diesel-Fuel Fine Filter Assembly with
Paper Element for Automobile Diesels
ISSUED ON: JANUARY 09, 2017
IMPLEMENTED ON: JULY 01, 2017
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Announcement ... 2
Foreword ... 9
1 Scope ... 11
2 Normative References ... 11
3 Terms and Definitions ... 12
4 Technical Requirements ... 12
5 Inspection Rules ... 18
6 Marking, Packaging, Transportation and Storage ... 19
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009 Directives for
Standardization – Part 1: Structure and Drafting of Standards.
This Standard was used in conjunction with QC/T 772-2017 Test Methods of Diesel-
Fuel Filer for Automobiles.
This Standard replaced QC/T 771-2006 Specifications of Diesel-Fuel Fine Filter
Assembly with Paper Element for Automotive Diesels. Compared with QC/T 771-2006,
this Standard ha the major technical changes as follows:
--- Add the applicable range of flow from 3.5 L/min (210 L/h) to 15 L/min (900 L/h);
--- Add GB/T 14041.1-2007 Hydraulic Fluid Power - Filter Elements - Part 1:
Verification of Fabrication Integrity and Determination of the First Bubble Point
(ISO 2942: 2004 IDT) to regulate filter element integrity;
--- Modify the original filtration efficiency of the assembly according to GB/T
28957.1-2012 Road Vehicles - Test Dust for Filter Evaluation - Part 1: Silicon
Dioxide Test Dust (ISO 12103-1:1997, Road Vehicles-Test Dust for Filter
Evaluation - Part 1: Arizona Test Dust, MOD), and GB/T 28957.2-2012 Road
Vehicles - Test Dust for Filter Evaluation - Part 2: Aluminum Oxide Test Dust (ISO
12103-2:1997 IDT);
--- Add HG/T 4392-2012 Rubber Seals for Automobile Filter to regulate the
performance of rubber seals;
--- Add the original resistance value of diesel fine filters with accessories such as
manual pumps and heaters;
--- Add the diesel fine filter with gravity or inertial water separation device according
to 5.5.3 The oil-water separation efficiency Limit value in the tested free water
separation (full sample method) from the fuel in QC/T 772-2017 Test Methods of
Diesel-Fuel Filer for Automobiles;
--- Add the water separation efficiency value according to 5.5.4 tested free water
(sampling method) separation from the fuel in QC/T 772-2017 Test Methods of
Diesel-Fuel Filer for Automobiles;
--- Add the water separation efficiency value according to 5.5.5 tested emulsified
water (sampling method) separation from the fuel in QC/T 772-2017 Test
Methods of Diesel-Fuel Filer for Automobiles;
--- Add the high and low temperature resistance requirements;
Specifications of Diesel-Fuel Fine Filter Assembly with
Paper Element for Automobile Diesels
1 Scope
This Standard specifies the technical requirements, test methods and inspection rules,
as well as marking, packaging, transportation and storage of diesel-fuel fine filter
assembly (referred to as assembly) with paper filter elements (including composite
filter element) for automobile diesels.
This Standard is applicable to diesel-fuel fine filter assembly (including spin-on
assemblies and assemblies with replaceable filter element) with paper element for
automobile diesels with a volume flow rate of 15 L/min (900 L/h) or less. For the other
paper element for diesel with the flow rate of more than 15L/min (900 L/h) can refer to
this application.
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) are applicable to this document.
GB/T 2828 Sampling Procedures and Tables for Lot-by-Lot Inspection by
Attributes (Apply to Inspection of Successive Lots or Batches)
GB/T 10125-2012 Corrosion Tests in Artificial Atmospheres - Salt Spray Tests
GB/T 28957.1-2012 Road Vehicles - Test Dust for Filter Evaluation - Part 1: Silicon
Dioxide Test Dust
GB/T 28957.2-2012 Road Vehicles - Test Dust for Filter Evaluation - Part 2:
Aluminum Oxide Test Dust
GB/T 14041.1-2007 Hydraulic Fluid Power - Filter Elements - Part 1: Verification
of Fabrication Integrity and Determination of the First Bubble Point
QC/T 772-2017 Test Methods of Diesel-Fuel Filter for Automobiles
HG/T 4392-2012 Rubber Seals for Automobile Filter
SAE J 1985-2006 Fuel Filter Initial Single-Pass Efficiency Test Method
3 Terms and Definitions
For the purpose of this Standard, the terms and definitions given in QC/T 772-2017
and the following apply.
3.1 Diesel-fuel fine filter
The last level of diesel filter that protects the diesel injecting device.
4 Technical Requirements
4.1 General
The assembly shall be manufactured in accordance with the product drawings and
technical documents approved by the prescribed procedures, and its technical
requirements shall comply with the provisions of this Standard.
4.2 Performance
4.2.1 Sealing property.
4.2.1.1 Test according to 5.1 in QC/T 772-2017.
4.2.1.2 The assembly is installed on a test bench; inject the dry air of the specified
pressure (or the pressure required by the test program) inside. The holding time is at
least 1 min. The joint surface and the sealing surface of the assembly are allowed not
to be leaked (no bubbles overflow).
4.2.1.3 The technical requirements for the sealing property of the assembly are given
in Table 1.
Table 1 – Technical Requirements for Sealing Property of the Assembly
Types of diesel filters Technical requirements
Diesel filter installed before
the oil transfer pump
If the internal pressure of the assembly reaches 400Pa, the joint surface,
sealing surface and all positions of the assembly are not allowed to be
leaked (no bubbles overflow)
Diesel filter installed after the
oil transfer pump
If the internal pressure of the assembly reaches 500Pa, the joint surface,
sealing surface and all positions of the assembly are not allowed to be
leaked (no bubbles overflow)
4.2.2 Integrity of filter element
4.2.2.1 Test on the integrity of filter element shall be conducted as per GB/T 14041.1-
2007.
4.2.12.2 Meet the requirements of 4.2.1 for sealing property. Disassemble the diesel
filter to check whether the internal filter element is de-glued, whether the joint is reliable,
whether the filter paper is cracked, whether there are defects such as plastic swelling
and metal corrosion.
4.2.13 Vibration fatigue.
4.2.13.1 Test according to 5.9 in QC/T 772-2017.
4.2.13.2 The assembly is installed in the way of loading (machine). After the vibration
fatigue test is performed under the prescribed vibration parameters, the following
defects are not allowed, such as permanent deformation, cracking, leakage at the seal
connection, and swelling deformation of the seal ring.
4.2.13.3 Before the assembly test, the sealing test shall be carried out in accordance
with 5.1 in QC/T 772-2017; and after confirming that it meets the requirements of 4.2.1,
the vibration fatigue test shall be performed. After the test, recheck whether the sealing
property meet the requirements, and whether conform to the provisions of 4.2.13.2.
4.2.13.4 Before the assembly test, there is test oil inside it, and the maintained oil
pressure ...