Reconditioning Services

Two-Stroke Piston Crowns

  • The DMI process involves detailed Inspection, Pre-machining in way of damaged crown top, worn ring grooves and other affected areas to the base metal.
  • Complete building up by automatic Submerged Arc Welding on a specially designed positioner.
  • Stress Relieving under precise controlled conditions.
  • Machining to the correct dimensional sizes.
  • Hard Chrome Plating of piston ring grooves as per OEM recommendations and grinding to finished size.
  • Pressure Testing and Certification.

Four-Stroke Piston Crowns

Both steel and cast iron piston crowns are reconditioned by:
  • Machining and Grinding of ring grooves to remove the worn and damaged material.
  • Hard Chrome Plating of the ring grooves and Grinding to standard or next oversize as per OEM recommendation.
  • Pressure Testing and Certification.
Aluminum pistons are reconditioned by using specialised Welding and Plating technology.

Cylinder Covers

  • Detailed Inspection and Pre-machining in way of burnt area to base metal.
  • Building up the eroded area on a specially designed automatic welding positioner.
  • Stress Relieving prior to Finish Machining.
  • Final Machining on all valve ports, landing face and cooling bores as per OEM recommendations.
  • Pressure Testing and Certification.

Piston Skirts

  • Removal of existing rubbing bands and Pre-inspection.
  • MPI check for cracks.
  • Fitting of new bands and Finish Machining to OEM dimensions.

Exhaust Valve Spindles and Seats

  • Pre-inspection for wear and damage.
  • Pre-machining to remove all fatigued material.
  • Rebuilding by MIG and Plasma Transferred Arc on the seat location.
  • Rebuilding of valve spindle stem by Hard Chrome Plating or Thermal Spray process.
  • Final Machining and Grinding to OEM specifications.

Exhaust Valve Housings and Cages

  • Pre-inspection of eroded and corroded areas.
  • Pre-grinding to remove all fatigued and burnt material.
  • Welding and Stress Relieving.
  • Final Grinding to the required size.
  • Application of Multi-layer Coating by Thermal Spray process. This coating can resist chemical attack from sulphuric acid and is highly resistant against erosion caused by the gas stream.
  • Pressure Testing and Certification.

Piston Rods

As per OEM recommendation, the piston rods are Ground undersize or brought to standard size by:
  • Build up using HVOF Thermal Spray process.
  • Final Grinding and Polishing to standard dimensions.

Cylinder Heads

  • Chemical Cleaning to de-carbonise and Pre-inspection.
  • Grinding or renewal of seat rings and valve spindles.
  • Renewal of valve guides and Servicing of rotor caps.
  • Machining of landing and combustion faces.
  • Assembly, Pressure Testing and Certification.

Cylinder Liners

  • Pre-inspection to determine wear and damage.
  • Honing or Deglazing.
  • Rebuilding by Porous Chrome Plating.
  • Final Honing to size.

Turbocharger Casings

  • Pre-inspection of eroded and corroded areas.
  • Pre-grinding to remove all fatigued and burnt material.
  • Welding and Stress Relieving.
  • Final Grinding to the required size.
  • Application of Multi-layer Coating by Thermal Spray Process. This coating can resist chemical attack from sulphuric acid and is highly resistant against erosion caused by the gas stream.
  • Pressure Testing and Certification.