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Send InquiryMAN 7L23/30H Crankshaft Repair at Khor Al Zubair Port, Iraq
Price 1650.0 USD ($)/ Number
MOQ : 1 Number
MAN 7L23/30H Crankshaft Repair at Khor Al Zubair Port, Iraq Specification
- Rotation
- Standard (check vessel manual for direction)
- Model
- MAN 7L23/30H
- Product Type
- Crankshaft & Engine Repair Service
- General Use
- Marine Crankshaft Repair and Overhaul
- Material
- Alloy Steel (Crankshaft Material)
- Type
- 7-Cylinder, Inline, Four-Stroke Marine Diesel Engine
- Capacity
- 7 Cylinders, High Output
- Weight (kg)
- Engine: Approx. 9,500 kg (varies as per build and casting)
- Computerized
- No
- Automatic
- No
- CNC Or Not
- Not CNC
- Control System
- Manual/Standard Mechanical Controls
- Magnetic Chuck Size
- Not Applicable (servicing crankshaft in situ)
- Floor Space
- As per vessel engine room layout
- Fuel Tank Capacity
- Subject to onboard engine specifications
- Spindle Speed
- As per original MAN engine configuration
- Power
- Engine Rated Power - MAN 7L23/30H specific
- Voltage
- As per vessels power supply requirements
- Dimension (L*W*H)
- Engine block: Approx. 3.0 x 1.2 x 2.0 meters (refer to actual model)
- Feature
- In-situ repair, Precision alignment, OEM parts support
- Color
- Industrial Green / Light Blue (as shown)
- Location of Repair
- Khor Al Zubair Port, Iraq
- Service Provider
- Marine technical & repairs specialist (as per port service records)
- Service Equipment Used
- Portable crankshaft grinding and alignment tools
- Service Details
- Crankshaft grinding, inspection, straightening, and assembly performed on-board
- Working Speed
- Variable as per MAN 7L23/30H specifications
- Application
- Main/auxiliary engine for marine vessels
- Number of Cylinders
- 7
- Suitable For
- MAN 7L23/30H marine diesel engines on all vessel types
- Engine Manufacturer
- MAN (Maschinenfabrik Augsburg-Nurnberg)
- Inspection Includes
- Magnaflux inspection, journal measurement, hardness testing
- Compliance
- OEM and Class Society standards (IACS, Lloyd's, DNV etc.)
- Crankshaft Material Grade
- High tensile alloy steel
- Stroke
- 300 mm (approx., model specific)
- Maximum Continuous Rating (MCR)
- Variable - typically around 1200 kW at 900-1000 rpm
- Cylinder Bore
- 230 mm (approx., model specific)
- Repair Methods
- On-site grinding, crack detection, dimensional restoration
About MAN 7L23/30H Crankshaft Repair at Khor Al Zubair Port, Iraq
The MAN 7L23/30H engine crankshaft of a vessel at Khor Al Zubair Port, Iraq, was reported damaged. RA Power Solutions has repaired a number of crankshafts of MAN 7L23/30H engines during the last 46 years of extending services all over the world. With our experience and based on the initial reports of damage shared by the vessel, we planned the strategy for the repair of the MAN 7L23/30H engine at Khor Al Zubair Port, Iraq.
The tooling was prepared, and two technicians having a valid seamans book flew to Khor Al Zubair Port, Iraq, with an onsite crankshaft grinding machine. The technicians also carried undersized crankpin bearings with them in order to facilitate the immediate commissioning of the engine after the necessary repairs were executed.
Engine Details of the MAN 7L23/30H
| S. No | Crankpin Details | |
| 1 | Engine Make | MAN |
| 2 | Engine Model | 7L23/30H |
| 3 | Engine Number | Auxiliary Engine No #03 |
| 4 | Crankpin Diameter Standard | 185.00 MM |
| 5 | Crankpin Bearing Width | 70.00 MM |
| 6 | Grinding of Crankpin Number | #04 & #06 |
| 7 | Place of Execution of Grinding of Crankpin | Khor Al Zubair Port, Iraq |
| 8 | Name of Shipping Company | Reputed Company from Dubai, U.A.E. |
| 9 | Date Of Execution | 01.06.2026 to 10.06.2026 |
Observation and Repair of the Crankshaft of MAN 7L23/30H at Khor Al Zubair Port, Iraq
i) On visual inspection, two crankpins, Nos. 4 and 6, were observed to be damaged. Crankpin bearing material was found in the oil sump of the entablature.
ii) Crankpins Nos. 4 and 6 were inspected for taper and ovality, and the following readings were observed.
| SIZE OF CR PINS BEFORE REPAIR | |||||||||
| A | Aa | C | Cc | B | Bb | Min | STD | Ovality | |
| CR-1 | |||||||||
| CR-2 | |||||||||
| CR-3 | |||||||||
| CR-4 | 184.93 | 184.97 | 184.75 | 184.70 | 184.82 | 184.79 | 184.70 | 185.00 | 0.30 |
| CR-5 | |||||||||
| CR-6 | 184.96 | 184.94 | 184.82 | 184.76 | 184.79 | 184.62 | 184.62 | 185.00 | 0.38 |
| CR-7 |
iii) Other parameters, such as hardness and crack detection tests by MPI, were carried out, and no abnormalities were observed.
iv) It was jointly decided, in consultation with the owners, to undertake the grinding in steps of 0.5 mm onwards, as per the manufacturers guidelines.
v) After the grinding operation, both crankpins No. 4 and No. 6 were undersized by 1.50 mm, and all parameters were maintained as per the manufacturers specifications and recommendations.
Final Dimensions After Repair
| SIZE OF CR PINS AFTER REPAIR | |||||||||
| A | Aa | C | Cc | B | Bb | Min | MAX | Ovality | |
| CR-1 | |||||||||
| CR-2 | |||||||||
| CR-3 | |||||||||
| CR-4 | 183.49 | 183.48 | 183.47 | 183.48 | 183.49 | 183.50 | 183.47 | 183.50 | 0.03 |
| CR-5 | |||||||||
| CR-6 | 183.50 | 183.49 | 183.48 | 183.47 | 183.50 | 183.49 | 183.47 | 183.50 | 0.03 |
| CR-7 |
Availability of Undersized Bearings for MAN 7L23/30H
RA Power Solutions technicians carried the undersized crankpin bearings to Khor Al Zubair Port, Iraq, and the engine was assembled and commissioned in their presence. RA Power Solutions maintains undersized bearings for popular engine makes to facilitate clients.
For all repairs, including the above crankshaft of MAN 7L23/30H, we provide records of the inspection report before and after the repair of the crankshaft. These reports are signed and stamped by the Chief Engineer of the vessel. On request, we can share these reports with our clients.
This case once again highlights RA Power Solutions proven capability to execute critical crankshaft repairs worldwide with high precision, strong technical expertise, and extensive field experience, ensuring reliable and timely solutions for marine and industrial engines.
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.
Comprehensive On-Site Crankshaft Repair
Repairs are executed on-board at Khor Al Zubair Port, eliminating the need to remove the crankshaft from the engine. Specialized portable grinding and alignment equipment ensure precise restoration of performance and geometry. The service includes thorough inspection for cracks and dimensional faults, followed by straightening and refitting as per OEM and class requirements.
Advanced Inspection for Critical Safety
The repair process features Magnaflux crack detection, accurate journal measurement, and hardness testing to guarantee structural integrity. Each step adheres to the stringent standards set by MAN and major classification societies like IACS, Lloyds, and DNV, ensuring that the engine meets all regulatory and operational benchmarks.
Restoration for MAN 7L23/30H Engines
Designed specifically for 7-cylinder, inline, four-stroke MAN 7L23/30H marine diesel engines, this service supports both main and auxiliary applications across various vessel types. Engine performance parameters such as MCR, RPM, and alignment are restored according to model-specific specifications, maximizing engine reliability and lifetime.
FAQ's of MAN 7L23/30H Crankshaft Repair at Khor Al Zubair Port, Iraq:
Q: How is the crankshaft repair performed for the MAN 7L23/30H at Khor Al Zubair Port?
A: The repair is conducted in-situ on the vessel by specialized marine repair technicians using portable grinding and alignment tools. The crankshaft does not need to be removed, reducing downtime and minimizing disruption to other engine components.Q: What inspection methods are included in the crankshaft repair service?
A: The service includes Magnaflux crack detection, journal dimensional measurement, and hardness testing. These inspections ensure the crankshaft's structural integrity and identify any wear or hidden defects in accordance with OEM and classification society standards.Q: When should a MAN 7L23/30H crankshaft be inspected or repaired?
A: Crankshaft inspection or repair is recommended during scheduled overhauls, if abnormal engine vibrations or performance issues arise, or following incidents such as oil starvation, bearing failures, or accidental overloading.Q: Where is the service for MAN 7L23/30H crankshaft repair available?
A: The service is specifically offered on-board vessels at Khor Al Zubair Port, Iraq, using mobile repair solutions tailored for the marine environment.Q: What benefits does in-situ crankshaft repair provide for marine engines?
A: In-situ repair avoids the need for major disassembly and transportation, significantly reducing downtime and costs. It also ensures precise alignment and compliance with OEM and class standards, enhancing engine longevity and operational safety.Q: How does the process handle crankshaft alignment and dimensional restoration?
A: Precision grinding tools and alignment equipment are used directly on the crankshaft to restore journals and straightness, correcting any run-out or deformation as per MAN 7L23/30H engine specifications.Q: What are the usage applications for this particular crankshaft repair service?
A: The service is suited for all vessel types equipped with MAN 7L23/30H engines, whether for main propulsion or auxiliary power generation, ensuring reliable engine function and regulatory compliance.
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