Chongqing Longdo Technology Co., Ltd.
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Chongqing Longdo Technology Co., Ltd.
Chongqing, China





In 2004, the company passed the ISO9001:2000 international quality management system certification. In October 2009, the company passed the ISO/IS16949:2002 international quality management system certification. On October 26, 2017, the company passed the IATF16949 quality management system certification.


Each year, the company passed strict certification controls, with the sole purpose of satisfying customer requirements for quality, reliability and service.



Quality Control


Depends on different stage, there will be different checking ratio.


The cylinder heads unitary pass by leak test of valves, for water circuit pressure test and oil circuit pressure test.


Checks controls on the machining are made across different steps of the manufacturing process and the results are automatically compared to the specifications registered in our systems.


Finally, in a unified way, a visual check of the entire piece before packaging is made.


So that we can make sure the product is perfect before delivering to our client.



Quality Warranty

Our cylinder heads have a warranty period of 18 months from when the stock began to operate, regardless of the number of kilometers.


Haray guarantees product quality through quality control and process control, aiming at avoiding quality problems before shipment. Meanwhile, Haray takes each quality advice from clients seriously and accepts quality-relevant claims caused by Harays reason within a limited time, and makes immediate compensation and quality improvement action.


And the cylinder heads returned to us for examination must be protected for shipment with the appropriate packaging. Besides, if any faults other than the actual cylinder head,


such as

poor assembly,

using poor quality cooling agents or lubricants,

abusive engine use,

not having carried out the relevant maintenance operations,

will not be covered by warranty.



R & D


HARAY attaches great importance to continuous investment on technology research and development.


What are R & D doing?

1.  Developing new models of cylinder heads;

2.  Analyzing and improving potential weaknesses of cylinder heads;

3.  Cooperating with Producing and Quality Control departments.