Category: Crankpin Polishing

Crankpin Reconditioning | Crankpin Polishing and Onsite Crank pin Repair – RA Power Solutions

RA Power Solutions has now made it easy to undertake crankpin grinding, crankpin repair and crank pin polishing onsite in a short time with the lowest cost.

We undertake onsite crankpin repair, crankpin grinding and crankpin polishing of crankshaft diameter ranging from 30 mm to 700 mm. This is undertaken by lightweight, easy to operate and portable onsite crankshaft grinding machine which is taken to the site. We have team of experienced technicians having valid passport and CDC. They can travel to any destination in the world in the shortest possible time with portable crankshaft grinding equipment and can also undertake repairs while sailing of vessel. Following procedure is generally followed for successful onsite crank pin repair of crankshaft:

Crack Detection Test of Crankpin
Crack Detection Test of Crankpin
  1. Initial dimensional inspection of crankpin is undertaken by calibrated measuring instruments for taper, ovality and other parameters.
  2. Radius fillet, lubricating oil hole of crankpin is checked for any loss of profile and damage.
  3. Crack detection test by high-intensity MPI torch is undertaken by level 3 qualified technicians.
  4. Hardness check and other important parameters are checked and recorded.

After the initial inspection, in case required grinding and polishing of crankpin is undertaken to maintain the tolerances strictly as per the manufacturer’s specifications.

The onsite crankshaft grinding machine used by RA Power Solutions engineers for grinding and polishing of crankpin and crankpin repair is self-designed and is improved from time to time.

Inpection of Crankpin is in Process
Inspection of Crankpin is in Process
Onsite Inspection of Crankpin Before Grinding & Polishing
Onsite Inspection of Crankpin Before Grinding & Polishing

The combination of skilled technicians and the most modern onsite crankshaft grinding machine is used for crankpin grinding delivers and maintains the tolerances after crankpin repair which is better than the international standards and the tolerances specified by the engine manufacturers. Our company is having more than four decades of experience in successful repairs of the crankshaft of high-capacity engines used for power generation, shipping, etc.

Grinding & Polishing of Crankpin on Board a Vessel
Grinding & Polishing of Crankpin on Board a Vessel

RA Power Solutions also provides the following onsite repair services:

  • Machining and grinding of crankpin journals up to 700 mm diameter.
  • Grinding of main journals
  • Machining and grinding of crankpin fillets
  • Grinding and Machining of main journal fillets
  • Machining and grinding of intermediate shaft/tail shaft
  • Grinding and polishing of crankshaft, turbine shaft, alternator shaft, pump shaft
  • Metal stitching/metal locking of damaged casting
  • Overhauling and repair of engine.
  • Rebabbitting of old white metal bearings
Repair & Overhauling of Engine
Repair & Overhauling of Engine
Repair of Intermediate Shaft
Repair of Intermediate Shaft

The author is Mr. Raj Shahani, the company’s managing director. He has 44 years of experience providing on-site repair services related to high-capacity engines worldwide. He designed and developed the portable crankshaft grinding machine to save time and money.

For more information regarding grinding of crankshaft, onsite crank pin repair, onsite repair services, and crankpin repair, please feel free to write us at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

Crankpin Grinding | Crankpin Repair By Insitu Crankshaft Grinding Machine – RA Power Solutions

Crankpin grinding, and crankpin repair by in situ crankshaft grinding machine is offered by RA Power Solutions through a highly motivated team of technicians who have the experience of more than four decades in crankshaft grinding and crankshaft repair. It is important that the crankshaft is initially inspected by experienced technicians in order to detect the fault after the damage or accident.

Damaged Crankpin of Yanmar Engine
Damaged Crankpin of Yanmar Engine
Inspection of Crankpin Under Process
Inspection of Crankpin Under Process

The following are the major parameters that are examined before the repair of the crankshaft:

  • The minimum and maximum diameter of the crankpin and main journal, taper, and ovality are checked.
  • Run out of main journals and deflection readings are taken to verify the loss of alignment.
  • A complete non-destructive test using MPI and ultraviolet lamp for heat cracks is undertaken of crankpins and the main journal of the crankshaft.
  • The crankshaft is also subject to a hardness test.

Based on the preliminary inspection reports prepared by the technicians, the repair procedure is planned. The onsite crankshaft grinding machine used for the crankshaft repair is lightweight and is placed on the damaged crank pin from the inspection window of the engine block. There is no requirement to remove the crankshaft from the Entablature and send it to the workshop, as bench-type grinders are now outdated.

The crankshaft grinding and crankshaft polishing are undertaken to maintain taper and ovality, surface finish as per the OEM requirement. RA Power Solutions has facilities to undertake in situ crankshaft grinding, crankshaft polishing, and repair of crankshafts up to the diameter of 700 mm without removing the crankshaft from the engine block.

Inspection of Crankshaft by Latest UV Torch
Inspection of Crankshaft by Latest UV Torch
Crankpin Grinding of Diesel Engine While Vessel is Sailing
Crankpin Grinding of Diesel Engine While Vessel is Sailing

During and after the repairs, all the major technical parameters are checked and a calibration report is prepared. It is possible to execute the crankshaft grinding and crankshaft repair on board a vessel while it is sailing. Technicians have seaman passports and can travel to any part of the world in the shortest possible time, thus attending to the damaged engine in a short time. We are class-approved and stand to guarantee the satisfactory performance of the crankshaft after repairs.

Crankpin Grinding and Crankpin Polishing is in Process
Crankpin Grinding and Crankpin Polishing is in Process
Crankshaft Radius Under Machining
Crankshaft Radius Under Machining

We are commonly working on the following eEngines:

Wartsila, Daihatsu, Mirrless Blackstone, Yanmar, Allen, MAK, MAN, B&W, Sulzer, Caterpillar, Fiat, Mitsubishi, MTU, Cummins, Deutz, Nohab Polar, Wartsila 12V32, Wartsila 18V32, Pielstick, Bergen, Detroit Diesel, MAK 552, MAK 453, MAK 451 AK, Niigata, MAK 452 AK, Ruston, Lister Blackstone K8 Major MK2, Volvo Penta, etc.

For more information on insitu crankshaft grinding repair, insitu crankshaft repair and grinding, onsite grinding machine supplier, and repair of crankshaft contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.