Save Crankshaft of DAIHATSU 5DC-17 Engine Model by Grinding
RA Power Solutions was advised about the failure of the connecting rod of DAIHATSU 5DC-17 Engine due to the breakage of connecting rod bolts. The connecting rod damaged crankpins and engine blocks from both sides. RA Power Solutions engineers were called by the owners of the vessel based in RUE DU GABIAN 98000 MONACO.
The details are as follows:
S. NO
|
Crankshaft Details
| |
1
|
Engine Model
|
DAIHATSU 5DC-17
|
2
|
Vessel Type
|
Container
|
3
|
Crankpin Diameter
|
145 mm
|
4
|
Crankpin Bearing width
|
64 mm
|
Crankshaft Repair:
The damaged crankshaft of DAIHATSU 5DC-17 engine was subject to following inspection procedure:
I. Dimensional inspection for taper and ovality
All the five crankpins having a standard diameter of 145 mm had ovality and taper ranging between 0.62 mm to 0.76 mm which is considered to be on the higher side.
II. Crankpin hardness was checked by portable calibrated hardness tester and it was observed within the limits.
III. Since the crankshaft met with an accident, all the crankpins were subject to crack detection by MPI. No cracks or abnormality were found in any of the five crankpins.
IV. On visual inspection, the radius filled profile was found damaged.
V. The deflection of the crankshaft was checked and was observed within limits.
All the five crankpins having a standard diameter of 145 mm had ovality and taper ranging between 0.62 mm to 0.76 mm which is considered to be on the higher side.
II. Crankpin hardness was checked by portable calibrated hardness tester and it was observed within the limits.
III. Since the crankshaft met with an accident, all the crankpins were subject to crack detection by MPI. No cracks or abnormality were found in any of the five crankpins.
IV. On visual inspection, the radius filled profile was found damaged.
V. The deflection of the crankshaft was checked and was observed within limits.
Based on the above initial inspection conducted by our technicians, the onsite grinding of all the crankpins was undertaken.
The crankpin size was reduced from standard 145 mm to following:
1. Minimum size after grinding maintained as 142. 98
2. Maximum size maintained after grinding as 143.00
All the parameters were checked during the final inspection and crankshaft was found acceptable.
The grinding of DAIHATSU 5DC-17 engine crankpin having a standard diameter of 145 mm and bearing with of only 64 mm was a challenge mainly because of the fact that in this particular model of DAIHATSU 5DC-17 engine, the bearing width is too less and it's difficult to accommodate the grinding tool on the crankpin. The old and leading grinding companies based in Europe and the UK do not have the facility and equipment to grind the crankpin having a width as less as 64 mm.
As a protocol and a normal procedure RA Power technicians prepare pre-inspection reports for all the technical parameters checked by them prior to repair of the crankshaft and also on the completion of the crankshaft repair of DAIHATSU 5DC-17 engine, final reports were prepared on RA Power Solutions inspection formats. These reports are available with us and can be shared in case required.
RA Power Solutions is proud to execute successfully onsite grinding of crankpin having such a small bearing width. The damaged engine block was repaired by the metal stitching and metal locking process by us and was saved from rejection. The engine after repairs is performing satisfactorily.
RA Power Solutions is the only company in the Asian continent providing onsite crankshaft repairs for the smaller crankpin width of even 40 mm. For further details, you may contact us on rajshahani@rapowersolutions.com
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