RA Power Solutions received a distress call from a shipping company based in Singapore, informing about the failure of the main engine. The vessel was stranded in Freetown Port, Sierra Leone, Africa. RA Power Solutions immediately sent two technicians with necessary instruments and tools to the Freetown Port, Sierra Leone, Africa, upon receiving a call from the shipping company. 

Since the onsite crankshaft grinding equipment used by RA Power Solutions is lightweight and compact, the equipment, along with necessary instruments, was sent with the technician as accompanying baggage. Hence, no time was wasted in the transportation of the equipment and technicians to Freetown Port, Sierra Leone. Upon the arrival of our technician on board the vessel, the following main observations were made.

S. No.	Crankpin Details of Sulzer (Main Engine) 6ZAL40S
1.	Engine Make	Sulzer (Main Engine)
2.	Engine Model	6ZAL40S
3.	Crankpin Diameter Standard	350.00 MM
4.	Crankpin Bearing Width	132.00 MM
5.	Place of execution of grinding of crankpins	Freetown Port, Sierra Leone (Africa)

1. Crankpin number 1 of the Sulzer (Main Engine) 6ZAL40S was observed to be damaged due to a seizure. The crankpin bearing melted and became embedded on the surface of the crankpin. After the removal of the bearing material, the crankpin was subjected to dimensional inspections. An ovality of 0.38 mm was observed.
2. During visual inspections, damage to the radius fillet profiles on both sides due to bearing seizure was observed.
3. Local depression or damage on the crankpin surface was also observed, but it was not possible to measure.
4. The hardness test was undertaken, and higher hardness was observed, which was scattered and did not form a continuous pattern.
5. The crack detection by the MPI method was undertaken repeatedly. We used a high-intensity magnaflux torch, and no cracks or abnormalities were observed.
6. All the important parameters, such as deflection and runout, were observed within a limit.

The action was taken by RA Power Solutions for the successful repair of the crankpin of the Sulzer (Main Engine) 6ZAL40S.

• In the case of the Sulzer (Main Engine) 6ZAL40S crankshaft, the manufacturer has specified a 1st step size of -0.40 mm, a second step size of 0.80 mm, and so on.
• Due to localized depression and damage to the crankpin, RA Power Solutions technicians undersized the crankpin to 1.20 mm. This was done as per the manufacturer’s recommendation and tolerances stipulated in the maintenance manual.
• Incidentally, the vessel was carrying a 1.20 mm undersize crankpin bearing, and the engine was assembled.
• The satisfactory performance was observed after the crankshaft repair. The sea trial was also undertaken in the presence of our technicians.
• The detailed inspection report was prepared and can also be shared with our readers/clients.

We have been regularly providing crankshaft grinding repair and crankpin bearing services in Iraq, Iran, Dubai, Oman, Saudi Arabia, Singapore, Russia, Qatar, Abu Dhabi, Sharjah, Ajman, Umm Al-Quwain, Fujairah, Bahrain, Gambia, Kuwait, Antigua and Barbuda, Belize, Dominica, Dominican Republic, Malaysia, Indonesia, Madagascar, Vietnam, Grenada, Guyana, Haiti, Jamaica, Saint Kitts and Nevis, Saint Lucia, South Korea, Saint Vincent, and the Grenadines, Trinidad, and Tobago, etc.

The post Sulzer (Main Engine) 6ZAL40S Crankshaft Machining And Grinding appeared first on Crankshaft Grinding Repair.

The major technical details of the crankshaft are given below:

• On going through the above major technical details of the crankshaft it can be seen that the crankpin width is as small as 71 mm and it is difficult for the onsite crankshaft grinding machine to be placed on the crankpin diameter for machining.
• RA Power Solutions has designed a dedicated tooling to undertake grinding of the MAK 8M20 crankpin having a bearing width of only 71 mm.
• Our team of two technicians inspected the crankpin and observed the ovality of 0.56 mm. The readings are posted below.

• All the parameters like hardness, MPI, and deflection were observed within limits.
• Grinding with a portable crankshaft grinding machine was undertaken. The diameter of 152.00 mm was reduced to 151.00 (1.0 mm undersize).
• Final readings after crankpin machining/crankpin grinding are pasted below:

• The undersize bearing was supplied by RA Power and the engine was successfully put back in operation within 15 hrs of boarding the vessel by our technicians.

For the specific engine and their model crankshaft repair, you may visit our blogs on the website RA Power Solutions or write to us to share the reports of various complicated repairs of crankshaft executed by us. RA Power Solutions is ISO 9001:2015 (Quality Management System) & ISO 14001:2015 (Environmental Management System) certified approved company.

We have been regularly executing on-site crankshaft repairs and crankshaft grinding in Dubai, Oman, Saudi Arabia, Qatar, Abu Dhabi, Sharjah, Ajman, Umm Al-Quwain, and Fujairah, Bahrain, Kuwait, Iraq, Antigua and Barbuda, Belize, Dominica, Dominican Republic, Grenada, Guyana, Haiti, Jamaica, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Trinidad, and Tobago, etc.

For more details on the Repair of the engine and supply of bearings and crankshaft machining polishing please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post Crankshaft Machining and grinding of MAK 8M20 appeared first on Crankshaft Grinding Repair.