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Piston crown reconditioning is a cost effective alternative to the purchase of a new one. Since working under a high-temperature and high-pressure condition for a long time, ring grooves and piston top are very venerable to heat. Its performance will bean be restored in our reconditioning plan. 

Before reconditioning

Corroded piston top

Corroded piston grooves

Equipped with advanced and completemachining equipments, gas shielded arc welding and submerged arc welding machines, large scale tempering heat treatment installation, as well as magnetic particle flaw detector and Ultrasonic Flaw Detector, Mariso is fully qualified to provide reliable piston crown reconditioning service to you with our experience and LR approved working procedures.

Pre-machining to eliminate the corrosion	Dye-check	Dye-check
Automatic arc-submerging welder	Automatic arc-submerging welding	Final maching CNC verticle lathe
Final machining	Final machining of piston grooves	Piston grooves after machining
After reconditioning                           LR inspection

• Pre-machining, cleaning damages or cracks and detect the flaws
• Building up cut-off of damages or cracks by welding
• Welding stress relief by  heat treatment
• Final machining
• Chrom plating of ring grooves
• Hydraulic pressure test