Power plant officials were advised to open all the connecting rods and visually inspect the crankpins of the Wartsila 9L20. Damage to crankpin number #09 was reported. On going through the photographs of the damaged crankpin, the radius fillet on both sides of crankpin number #09 was observed to be damaged.

RA Power Solutions‘ two (2) technicians, along with an onsite crankshaft grinding machine, were deputed from our plant in New Delhi. The details of the engine and crankshaft are as follows:

Action Taken by RA Power Solutions to Repair the Crankshaft of Wartsila 9L20 in Madagascar, East Africa

i) RA Power technicians followed a standard inspection protocol, during which the damaged crankpin number 9 was subjected to a dimensional check, crack detection by MPI, hardness check, etc. A pre-inspection report was prepared.

ii) On inspection of crankpin #09, excessive ovality of 0.41 mm was observed against the specified limit of 0.03 mm. The dimensional report is pasted below. Technicians also observed bearing line marks on the crankpin.

iii) RA Power Solutions carried out the repair by undersizing crankpin #09 of the Wartsila 9L20 by 1.00 mm, as the power plant had a 1.00 mm undersized bearing available. The engine was successfully commissioned in the presence of our technicians.

iv) The onsite crankshaft grinding machine, developed and manufactured by RA Power Solutions, is of the latest design and maintains a tolerance within 0.02 mm (20 microns) after grinding. The surface finish achieved is of a very high standard—15 RA value or less—which is highly recommended for ensuring the long life of bearings and crankshafts.

RA Power Solutions offers onsite crankshaft grinding and repair services under a wide range of conditions, whether on a ship at sea or at a power plant/cement plant in a remote location. All crankshaft grinding services provided by RA Power are guaranteed to ensure the satisfactory performance of the crankshaft and diesel engine after repairs.

RA Power Solutions is a well-known company that provides crankshaft repair, machining, and engine overhaul services on site to the marine, industrial, and power-generating sectors all over the world. The company has been in business for more than 45 years and has completed projects in Asia, Africa, Europe, the Middle East, and South America, bringing precision-engineered solutions right to clients’ premises. RA Power Solutions has powerful portable machining machines and a team of highly qualified experts. This means they can respond quickly, make repairs that are cost-effective, and do work that is as accurate as the original equipment manufacturer (OEM) anywhere in the world.

For more information on onsite crankshaft repair, grinding of crankshaft, and crankshaft polishing, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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RA Power Solutions technicians were deployed from New Delhi and boarded the vessel at the Suez Canal. Following are main details of Daihatsu 6DK-20 Crankshaft Repair and engine.

Details of the Inspection of the Crankshaft of Daihatsu 6DK-20 undertaken by Technicians

• During the visual inspection, we found crankpin #6 of the crankshaft damaged. The remaining crankpins were in good condition.
• The hardness of the crankpin was checked and observed on the higher side in some spots.
• After removing the bearing material from the crankpin, we carried out a crack detection test. We observed multiple hairline cracks.
• The crankpin number #6 was subject to dimensional inspection. Against the standard diameter of 170.00 MM. The Minimum diameter observed was 169.26 MM, thus the ovality of 0.74 MM.

The report is pasted below:

SIZE OF CR JOURNAL

Action Taken By RA Power Solutions for the Repair of the Damaged Crankpin

• We initially ground crankpin #6 to a size of 169.00 mm, which is 1.00 mm undersize from the standard diameter.
• Since the crankpin still had ovality and damage line marks, we jointly decided with the Chief Engineer to undersize the crankpin by 2.00 mm. We maintained the final size of the crankpin at 168.00 mm.

Hardness Test of Crankpin	Grinding of Daihatsu DK-20 Crankpin

Supply of Crankpin Undersize Bearing by RA Power Solutions Pvt Ltd

RA Power Solutions technicians carried with them undersized bearings of 1.5 MM/2.0 MM/2.5 MM. The 2.00 MM bearing was retained by the ship staff and the engine was commissioned. The Auxiliary engine as on date is performing satisfactory.

In this case, time was short. RA Power technicians hand-carried a 2.00 mm undersize bearing, which greatly helped the client. The team commissioned the engine within four hours of grinding the crankpin.

Daihatsu 6 DK-20 Crankpin After Grinding to 2.0 mm Undersize	Daihatsu Crankpin After Polishing

RA Power Solutions maintains a stock of 6DK-20 engines, up to 4.00 MM undersize bearings, and have saved number of crankshafts from rejection.

For more information regarding crankshaft grinding services, Daihatsu 6DK-20 Crankshaft Repair please contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

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Crankshaft Grinding and Polishing Equipment Manufactured by RA Power Solutions

The Crankshaft grinding machine up to 700 mm in diameter are manufactured by RA Power Solutions. These machines are portable and can undertake grinding of crankpin and main journal onsite. There is no requirement of sending the crankshaft to the workshop.

The Crankshaft requires repair in the following conditions:

1. In case of failure of the bearing.
2. Development of excessive taper & ovality.
3. Rough surface of crankpin & main journal.
4. Development of line marks and pitting marks.

With the introduction of onsite crankshaft grinding machine, it has become very easy for the end user to undertake the grinding and polishing of crankshaft in situ and Crankshaft Grinding Machine Manufacturer. The machine is widely used by shipping companies, large diesel power plants, repair workshops, etc.

Crankshaft Grinding Machine manufactured by RA Power Solutions	Onsite Crankshaft Grinding Machine

Advantages of Crankshaft Grinding and Polishing Equipment Manufactured by RA Power Solutions

1. The machine is portable and lightweight. Technicians can take it to any site worldwide.
2. Grinding up to 700 mm in diameter is possible.
3. Technicians can control the taper ovality within 0.03 mm, depending on the diameter of the crankpin.
4. The machines are designed to deliver a surface finish of less than 20 RA value. This surface finish is better than the international standard.
5. The machine is easy to operate and maintain.
6. On-site training or training in-house school is given.
7. We dispatch the machine in a lightweight toolbox. Clients can carry it anywhere in the world.

Crankshaft Grinding Equipment

For your requirement of grinding and polishing machine manufacturer, crankshaft grinders, crankshaft polishing, crankshaft grinding machine manufacturers, and crankshaft polishing equipment contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131, 9810012383.

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We were approached by a shipping company based in Mumbai, India, to whom we have been extending on site crankshaft grinding and Onsite Crankshaft Repair services for the last 45 years.

They approached us about the problem in the crankshaft of the YANMAR Diesel Engine model 6N18AL-DV.

THE ENGINE DETAILS ARE AS FOLLOWING:-

ACTION TAKEN BY RA POWER SOLUTIONS FOR REPAIR OF CRANKSHAFT OF YANMAR DIESEL ENGINE 6N18AL-DV:-

• Two technicians with an onsite crankshaft grinding machine boarded the vessel, and the crankshaft was subject to inspection.
• All six crankpins were subject to calibration for taper and ovality.

THE DIMENSIONS WERE CHECKED AS PER RA POWER SOLUTIONS PROTOCOL, WHICH IS MENTIONED BELOW:-

STANDARD DIMENSION OF CRANK PIN – 145.00 MM

STANDARD /SPECIFIED NO.                                                                                        SIZES IN MM

                                                                             SIZE OF CR PINS

• We inspected the hardness of all crankpins. The readings ranged from 590 to 650 HB.
• We carried out an MPI test on the crank pins to detect cracks. The test showed no cracks.
• We checked the deflection of the crankshaft. The readings were within limits.

SUCCESSFUL REPAIR OF CRANKSHAFT OF YANMAR DIESEL ENGINE 6N18AL-DV:-

• We observed higher ovality ranging from 0.16 to 0.22 mm. Based on this, we decided to grind all the crank pins.
• We ground all the crankpins undersize by 0.40 mm as per the manufacturer’s recommendation. The final size ranged from 144.58 to 144.60 mm. We maintained a maximum ovality of 0.02 mm..

THE FINAL DIMENSIONS MAINTAINED AFTER GRINDING ARE MENTIONED BELOW:-

STANDARD DIMENSION – 145.00 MM

STANDARD /SPECIFIED NO.                                                                                        SIZES IN MM

                                                                             SIZE OF CR PINS

Precision Repair of Yanmar Diesel Engine Crankshafts

The small crankpin bearing width requires the latest crankshaft grinding equipment which is possessed by us and we have been executing successfully the repair of the crankshaft of YANMAR Diesel Engine 6N18AL-DV and other models having small bearing length all over the world.

In our 45 years of experience we have executed successfully repair of more than ten thousand Crankshafts.We strictly maintain all tolerances stipulated by the manufacturer.

We have been executing the repairs in Laos, Lebanon, Malaysia, Maldives, Mongolia, Nepal, North Korea, Oman, Philippines, Qatar, Russia, Saudi Arabia, Singapore, South Korea, Sri Lanka, Syria, United Arab Emirates, Yemen etc.

For more information on Onsite Crankshaft Repair, Yanmar Crankshaft Repair, onboard crankshaft repair, insitu machining equipment, crankpin journal repair, and ship crankshaft machining, contact us at rajshahani@rapowersolutions.com, info@rapowersolutions.com, or call us at +91-9582647131 or +919810012383.

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