GB/T 34595-2017The technical specifications for remanufacturing of automotive components—Water pump (English PDF)

5.1 Testing and repair of water pump housing

5.1.1 Visual inspection

Non-destructive testing methods such as visual inspection, liquid penetrate testing, pressure sealing test, eddy current testing, etc. can be used to detect the existence of defects such as cracks in the water pump housing. If cracks are too severe to be remanufactured, it shall be scrapped. If there are flaws in the oil passages of the inner cavity of the housing and the mounting holes, surfaces, etc., they shall be scrapped.

5.1.2 Dimension testing

In accordance with the requirements of the drawings, TEST the geometric accuracy of the water pump housing such as dimensional tolerance, geometric tolerance, etc. MAKE the records accordingly.

5.1.3 Water pump housing repair

5.1.3.1 For defects that are not affected by pressure, the methods such as cracking rivets, welding repair (arc cold welding, cold gas welding, brazing or spray welding, etc.) or the use of special glue to bond the broken and cracked parts of castings may be used for repair. After repair, it is required to make a smooth surface by grinding. On the machined surface, grinding or cutting is applied until it is flush with the reference surface. For those with sealing or pressure requirements, airtightness tests, hydrostatic tests, or leak tests shall be conducted after repair.

5.1.3.2 The defects such as pores, blisters, etc. can be filled with a special repair agent and repaired by machining and cutting.

5.1.3.3 TEST the dimensional tolerance, geometric tolerance, surface structure, etc. of the housing. Where the housing hole size is out of tolerance or worn, the machining methods such as grinding, reaming, etc. are used to eliminate wear trace. Then PROVIDE with oversized lining. Or USE cladding, cold welding, spraying and other methods to restore the size.

5.1.3.4 For the damages to machining plane, USE metal spraying or other welding repair methods to repair, through the addition of materials, followed by machining.

5.1.3.5 If the remaining holes are damaged, PRE-TREAT the damaged mating holes. REPAIR by welding repair. For damaged threaded holes without