RA Power Solutions undertakes Diesel Engine Crankshaft Repair onsite without removing the crankshaft from the engine block. We have the equipments technology to undertake onsite grinding polishing of Diesel Engine Crankshafts Repair which get damaged.
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:-
| S. NO | Crankshaft Details | |
| 1 | Engine Make | YANMAR Diesel Engine |
| 2 | Engine Model | 6N18AL-DV 450 kVA |
| 3 | Crankpin Diameter Standard | 145 mm |
| 4 | Crankpin Bearing Width | 65 mm |
| 5 | Name of Vessel | MV MAITLI |
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
| A | Aa | C | Cc | B | Bb | Min | STD | Ovality | |
| CR-1 | 144.8 | 144.88 | 144.85 | 144.9 | >144.81 | 144.87 | 144.8 | 145 | 0.20 mm |
| CR-2 | 144.84 | 144.87 | 144.88 | 144.89 | 144.88 | 144.87 | 144.84 | 145 | 0.16 mm |
| CR-3 | 144.82 | 144.87 | 144.85 | 144.9 | 144.81 | 144.87 | >144.81 | 145 | 0.19 mm |
| CR-4 | 144.83 | 144.88 | 144.85 | 144.9 | 144.8 | 144.9 | 144.8 | 145 | 0.20 mm |
| CR-5 | 144.84 | 144.88 | 144.89 | 144.89 | 144.81 | 144.88 | 144.81 | 145 | 0.19 mm |
| CR-6 | 144.8 | 144.89 | 144.86 | 144.87 | 144.78 | 144.88 | 144.78 | 145 | 0.22 mm |
- All the crankpins were also subject to inspection of hardness, and the hardness was observed between 590 to 650 on the HB scale.
- The crank pins were also subject to MPI test for crack detection, and no cracks were observed.
- Deflection of the crankshaft was checked and was observed within limits.
SUCCESSFUL REPAIR OF CRANKSHAFT OF YANMAR DIESEL ENGINE 6N18AL-DV:-
- Considering the observation of higher ovality ranging from 0.16 to 0.22 mm, it was decided to undertake the grinding of all crank pins.
- All the crankpins were undersized by 0.40 mm as per the manufacturer recommendation and final size was maintained between 144.58 to 144.60 mm with ovality of maximum 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
| A | Aa | C | Cc | B | Bb | Min | Max | Ovality | |
| CR-1 | 144.6 | 144.59 | 144.59 | 144.58 | 144.6 | 144.59 | 144.58 | 144.6 | 0.02mm |
| CR-2 | 144.59 | 144.59 | 144.59 | 144.58 | 144.6 | 144.6 | 144.58 | 144.6 | 0.02mm |
| CR-3 | 144.6 | 144.58 | 144.59 | 144.59> | 144.59 | 144.6 | 144.58 | 144.6 | 0.02mm |
| CR-4 | 144.6 | 144.6 | 144.59 | 144.58 | 144.58 | 144.59 | 144.58 | 144.6 | 0.02mm |
| CR-5 | 144.59 | 144.6 | 144.59 | 144.58 | 144.59 | 144.6 | 144.58 | 144.6 | 0.02mm |
| CR-6 | 144.6 | 144.59 | 144.58 | 144.58 | 144.6 | 144.59 | 144.58 | 144.6 | 0.02mm |
Precision Repair of Yanmar Diesel Engine Crankshafts
The repair of the crankshaft having a diameter of 145 mm and bearing width of only 65 mm was executed due to availability of necessary tooling with us.
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. All the tolerances as stipulated by the manufacturer are strictly maintained.
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.
This blog is written by Mr. Raj Shahani (Managing Director of RA Power Solutions India Pvt. Ltd.).
Mr.Shahani is a highly experienced business leader with rich experience of more than 45 years in the field of Power, Heavy, and Shipping industry. He is Technical Adviser to many shipping and heavy industries across the globe.
Mr.Shahani is one of the most enthusiastic professionals, and he has all the brilliance of an exemplary leader. He is an extremely effective coach and mentor of teams and is adept at providing leadership in a global, cross-cultural environment.
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.
