Overhauling of Main Engine Repair | Repair of Engine Metal Stitching of Damaged Block

RA Power Solutions received an emergency call from a Steel Company based in Indonesia regarding damage of their Engine SULZER 6RND68.

On arrival of our team of engineers, it was observed that lower engine block of SULZER 6RND68 was damaged badly. Hence it required disassembly of complete engine, overhauling and repair of engine block by metal stitching & metal locking.

Damaged Engine Block
Damaged Engine Block

Following is the brief of job description executed:

  • Inspection and overhaul of the cylinder covers including the fuel and starting valves located in the covers. The cylinder covers cooling spaces were also inspected, cleaned and fitted back with new O-rings.
  • Dismount, Inspect and overhaul the exhaust valves, renewed the seals and grinding the valve spindles.
  • The cylinder liners were cleaned, calibrated and honed in order to restore the liners running surfaces and remove ovality. This ensured that the piston rings perform better and this will lead to a better overall cylinder condition, compared to if honing had not been done. The cylinder liners cooling spaces were also inspected, cleaned and fitted back with new o-rings.
  • Replacement of thrust block pads and correction of end play.
  • Metal locking of damaged Engine block by our technicians.
Special Keys & Locks Used in Metal Stitching Process
Special Keys & Locks Used in Metal Stitching Process
Repair of Engine Block by Metal Stitching is in Process
Repair of Engine Block by Metal Stitching is in Process
  • Inspected and adjusted the chain drive.
  • Retightened the stay-bolts, holding down bolts end chocks.
  • Took bearing clearances with a telescopic feeler gauge and checked bearing edges by wire gauges.
  • Crankshaft alignment measurement was taken with dial gauge (autolog method)
    Conclusion: The engine was tested on full load for 72 hours & all the parameter were recorded. The engine is performing satisfactorily.
Repair & Overhauling of Engine is in Process
Repair & Overhauling of Engine is in Process
Inspection of Engine Spare Parts is in Process
Inspection of Engine Spare Parts is in Process

For more details regarding Metal Stitching of Damaged Block, overhauling of engine, repair of engine metal stitching of damaged block, crankshaft grinding, and engine block repair please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

Cast Iron Crack Repair By Metal Stitching – RA Power Solutions

Cast iron crack repair by metal stitching and metal locking process is highly recommended. Metal stitching process for repairing casting is widely use, and accepted in the industry, and more successful process for repairing cracks in cast iron.

Steam turbine casing of Hangzhou make was reported damaged due to accident. The turbine operates at 130 MW peak load.

RA Power Solutions deputed technician to the site with latest breed of instruments, equipments and consumables in order to undertake inspection of the turbine casing and to execute necessary repair following observation was made.

Observation-

Turbine casing due to accident developed multiple cracks at different locations. Crack of following dimensions were observed

  • Crack having a length of 190mm with indiscipline profile
  • 2 Cracks having length of about 300mm
  • Casting having dimensions of 600mm/450mm with thickness of 45mm was damaged into pieces
Turbine casing
Turbine Casing
Damaged turbine casing
Damaged turbine casing

Crack repair by Metal lock and Metal stitching.

Crack Repair and damaged casting replacement was undertaken by RA power technicians.

  • The damaged casting area was cut and disciplined profile was given measuring 650mm/520mm this area was properly ground
  • The damaged sample piece was sent for metallurgical test to know the composition of material.
  • A wooden pattern was made at site having an exact profile as of damaged area.
  • A new casting piece having superior metallurgical properties then the original damage casting was manufactured.
  • The new casting piece was fixed in damage area by metal stitching and metal locking process.
  • RA power engineers used metal locks, metal keys and all consumables’ imported from UK for repair of cracks and damage casting.
  • The polishing of outer and inner surface of damaged area was done and painted.
  • The turbine is presently working satisfactory and has completed 3500hr of operation.

RA power under takes repair of crack casting by metal stitching and metal locking process from last 40 years and have executed successfully repair of heavy components used in power plants, industry, ships etc…

The metal stitching and metal locking can also be undertaken while sailing the vessel.

To know more about cast iron crack repair, metal locking, cast iron stitching, metal surgery, and engine block repair, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

Repair of casing by metal lock and metal stitching
Repair of casing by metal lock and metal stitching
Turbine casing after repairs
Turbine casing after repair