Specialist in Daihatsu DC-17 Crankshaft grinding and repair

RA Power Solutions has developed dedicated onsite crankshaft grinding equipment by which it is possible to undertake the grinding of Daihatsu DC-17 crankpins.

The details are as follows:

The post Bearing Shell | Crank pin | Main Journal Bearing | Daihatsu DC-17 appeared first on Crankshaft Grinding Repair.

The vessel was not able to cross the Suez Canal due to the non-operation of two numbers of auxiliary engines. The third auxiliary engine was also not in good condition and was able to take the load of only 50%. RA Power Solutions deputed two technicians to Suez Egypt and boarded the vessel.

Following are the details of the Engine & Crankshaft

Observations & actions taken by RA Power Solutions to repair successfully the crankshaft of Daihatsu 5DC-17 as follows

• The five-number crankpins of AE#01 and AE#03 were checked dimensionally. The taper & ovality of 0.20 mm to 0.30 mm has observed in AE#01 and in the case of AE#03, the ovality was more than 0.50 mm. Other parameters like hardness, MPI test, deflection, and visual inspection of damaged crankpins were undertaken & observed within limits.
• The grinding of all five crankpins of AE#01 was undertaken to the undersize of 0.5 mm and AE#03 was undersized by 1.0mm.
• All parameters were again checked after grinding was executed and observed satisfactory.

Supply Of Undersize Bearing Of Daihatsu 5DC-17 as follows

The crankpin repair undersize bearing of Daihatsu 5DC-17 of 0.5 mm and 1.0 mm was supplied by RA Power Solutions. The engine was commissioned successfully.

Only a company in the world can undertake repair of the crankshaft of a Daihatsu engine with a damaged radius fillet while sailing of the vessel.

• The Bearing width of Daihatsu 5DC-17 is only 64 mm. It requires a very compact onsite crankshaft grinding machine to execute the repair which no other company in the world possesses.
• RA Power Solutions is the only organization that has successfully executed the repair of the crankshaft of Daihatsu 5DC-17 has more than a hundred numbers successfully and saved millions of dollars for the ship owners.

For more details on the crank pin grinding repair and repair of the crankpin please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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Major Yanmar S185L-ST Engine Details are as Following

On inspection of the crankshaft, the following were the main observations

• On the visual inspection of crankpin no. 1 having a standard diameter of 140 mm and bearing width of 62 mm, it was observed that the big end bearing failed and bearing material got embedded on the crankpin no.1 journal surface.
• The crank pin journal surface had multiple bearing line marks, was rough, and was severely scored.
• The radius fillet of both sides was damaged losing its original profile.
• Considering this to be a serious accident, all the connecting rods were disassembled and crank pins were subject to thorough inspection by our technicians.
• No deviations were observed in other crankpins on dimensional inspection.
• The hardness of crankpin no.1 was checked after removing the bearing from the crankpin journal which got embedded due to seizure of the bearing and observed within a limit.
• The crack detection test was done by a high-intensity magna flux torch and MPI equipment.
• No abnormality or cracks were observed.
• This was a big relief to our technicians as considering the serious nature of the accident, surface cracks in crank pin no. 1 were expected.
• Deflection of the crankshaft was taken and was observed within limits.

Following are the Readings Observed

The Crankpin no.1 was subject to dimensional inspection and the following readings were observed.

• Crankpin no. 1, Minimum diameter observed before repair – 139.50 mm
• Crankpin no. 1, Maximum diameter observed before repair – 139.88 mm
• Total ovality observed – 0.50 mm, considering the standard diameter of 140 mm.

Crankpin Repair Undertaken by RA Power Solutions for Successful Operation of Crankshaft of Yanmar S185L-ST Engine

• Initially, the crank pin having a standard diameter of 140 mm and bearing width of only 62 mm was ground to 0.50 mm under size with the hope the scratches and deep line marks would be removed.
• Since even after grinding 0.50 mm, the deep line marks were visible, it was decided to undersize the crank pin further by 0.5 mm.

Finally, Crankpin no. 1 was Ground to 1 mm Undersize, and Dimensions Were Maintained as Following After Grinding

• Minimum diameter observed after grinding – 138.98 mm
• Maximum diameter observed after grinding – 139.00 mm
• Maximum ovality observed – 0.02 mm

The undersized bearing of 1 mm was supplied by RA Power Solutions from their stock and the engine was put back into operation.

Main Features of Executing Successful Crankpin Repair of Yanmar S185L-ST Engine

• The company has experience of more than four decades in the field of crankshaft repair having experienced technicians trained in in-house training school.
• Manufactures its own on-site crankshaft grinding machine using it for the last 25 years. This facilitates us even to grind shafts in the limited space available.
• Only company in the world that can undertake the grinding of small diameter and main journal like in the case of Yanmar S185L-ST having a diameter of 140 mm and bearing length of only 62 mm. This needs a compact on-site crankshaft grinding machine.
• The only company in the world that can execute the grinding of crankshaft while the vessel is on the move maintaining the tolerance of 0.01/0.02 mm with a surface finish of less than 20 RA value.
• Maintaining under size and special size of bearings in stock, hence no time is wasted to put back the engine into operation.
• All technicians having Indian CDC can fly to any destination in the world on short notice.
• The on site crankshaft grinding machine is carried by our technicians as accompanied baggage and no need to book the machine in cargo and waste time in customs clearance etc.
• Light-weight machines cost less in terms of air freight charges towards transportation.
• We are considering offering our services at the lowest cost in the world.
• For a reduction in cost of the maintenance and to put back engines into operation, contact us.

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 about the crankshaft of Yanmar S185L-ST Engine, and Crankpin Repair, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post On Board Grinding of Crankshaft of Yanmar S185L-ST Engine appeared first on Crankshaft Grinding Repair.

Crankshaft Failure

• Use of nonstandard lubricating oil or using it for an extended time without changing it.
• Use of bearings beyond the operating hours specified in the maintenance manual of the engine manufacturer.
• Use of substandard lubricating oil filters and using them beyond the specified hours.
• Not maintaining the lubricating oil temperature and oil gap as per the maintenance manual.
• Use of substandard quality bearings.
• Not carrying out the periodical inspection of the crankshaft at the time of undertaking maintenance.
• Non-calibration of crankpin and main journal diameter for taper and ovality.
• Ignoring of crankpin and main journal line marks, pitting, rough surface.
• Increase in deflection readings.
• Non-replacement of connecting rods in case of abnormalities observed.
• Non-calibration of connecting rods big end bore and small end bore.
• Non-inspection of connecting rods, bolts for cracks or distortion, and tightening torque.

As mentioned the crankshaft failure can be caused due to not paying attention to the above.

RA Power Solutions Pvt. Ltd. has been working on the crankshaft of medium and high-capacity engines, 2-stroke and 4-stroke engines for four decades and strongly suggests that all the parameters mentioned in the maintenance manual of the engine manufacturer should be checked. The checks mentioned above are of great importance and we have experienced that most of the crankshaft and engine Get damaged due to ignoring the above points, the user can extend the life of the engine considerably by following the above checks. RA Power Solutions undertakes onsite repair of the crankpin journal and main journal Grinding of the crankshaft.

The following are the main features of crankshaft journal repair

• We undertake crankshaft grinding, and repair of crankshafts having diameters from 35 mm to 700 mm irrespective of the length of the crankshaft.
• The crankshaft repair is undertaken onsite, there is no requirement for the removal of the crankshaft from the engine block.
• All the parameters like taper ovality, and surface finish as mentioned in the maintenance manual are strictly maintained.
• Crankshaft journal repair & Crankshaft journal Grinding are done onsite and by use of the latest crankshaft grinding machine, the repairs are done in minimum time reducing the downtime considerably.
• We can depute technicians on short notice all over the world and our technicians have valid Indian CDC. We also depute our engineers to undertake reinspection of the crankshaft with the calibrated instrument and regrinding of the crank journal if required can be done on the spot.

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

The post Crankshaft Failure | Crankshaft Journal Repair | Crankpin Repair appeared first on Crankshaft Grinding Repair.

A crankshaft is a piece of art manufactured with close tolerances; it needs expert services to successfully execute the repair. We have repaired some crankshafts that the small and inexperienced companies damaged due to lack of know-how and experience. Recently, we have saved the crankshaft of MAN Diesel Engine Model no. CME 5L 16/24 from rejection.

Following are the details:

Crankshaft repair of MAN Diesel Engine Model No. CME 5L 16/24. Crankshaft Grinding Engine Details Table

It was reported by Dubai Dubai-based company that one of their vessel which was sailing near Chittagong port had met with an accident and the crankshaft was damaged. RA Power Solutions. deputed two technicians along with necessary tooling to Chittagong. They boarded the vessel in a short time of 12 hours after receiving the first communication of the breakdown. This was possible as all our technicians have valid Indian CDC.

Following the Inspection of the crankshaft was conducted

• All the crankpins were subject to crack detection by MPI and no crack or abnormality was observed on the crankpin.
• Hardness with a portable calibrated hardness tester was checked and was found within limits.
• The deflection of the crankshaft was within limits.

All the crankpins were checked for taper and ovality out of five crankpins, two number crankpins had the following readings

Ongoing through the above dimensions, owners were surprised as the damage to the crankpins was beyond the last limit stipulated by the engine manufacturer i.e. MAN Diesel for Engine Model no. CME 5L 16/24. In other words as per the manufacturer, there was no solution but to reject the crankshaft and replace it with a new one.

RA Power Solutions took the following action to save the crankshaft from rejection

• Based on the above readings of crankpin no. 2 and crankpin no. 4, it was decided to undersize the crankpin to 1.5 mm and 2 mm from the standard diameter of 130 mm.
• The grinding was undertaken by our technicians and the final diameter of 128.50 and 128.00 mm was maintained.
• The undersized crankpin bearings of 1.5 mm and 2 mm were arranged by RA Power Solutions.
• The MAN Diesel Engine Model no. CME 5L 16/24 was commissioned and the engine is performing satisfactorily.

The under-sizing of the crankpin up to 2 mm is of course done under deviation and against the manufacturer’s recommendation but the fact is that the crankshaft has been successfully repaired and is saved from rejection which helped the owners of the vessel to save a considerable amount and downtime. We at RA Power Solutions always believe in saving the crankshaft from rejection. The cost of the crankshaft is exorbitant and has no justification by the engine and crankshaft manufacturer who enjoy the monopoly.

RA Power Solutions suggests not engaging companies with no expertise and specialized equipment for the repair of the crankshaft. We have the knowledge, experience, and necessary equipment to undertake the repair.

Crankpin Repair Services

We observed that companies avoid crankpin repair due to the time taken to repair of crankpin and the high cost. This was true as few companies based in Europe and Singapore enjoyed the monopoly and charged exorbitantly for crankpin repair. With the introduction of onsite crankpin repair and main journal repair machine, it is now possible to undertake the crankpin and main journal grinding and polishing in minimal time.

Secondly, the cost of crankpin repair charged by RA Power Solutions is almost one-fourth of the charges of European and other companies. In simple language, crankpin repair has become easy with a low cost. For more information about crankshaft grinding services, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post World Leading Company of Crankshaft Grinding Services | RA Power Solutions appeared first on Crankshaft Grinding Repair.