Save Crankshaft of DAIHATSU 5DC-17 Engine Model by Grinding

RA Power Solutions was advised about the failure of connecting rod of DAIHATSU 5DC-17 Engine due to breakage of connecting rod bolts. The connecting rod damaged crankpins and engine block from both the 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:

Crankshaft Repair:

The damaged crankshaft of DAIHATSU 5DC-17 engine was subject to following inspection procedure:

• Dimensional inspection for taper and ovality.
• All the five crankpins having standard diameter of 145 mm had ovality and taper ranging between 0.62 mm to 0.76 mm which is considered to be on higher side.
• Crankpin hardness was checked by portable calibrated hardness tester and it was observed within the limits.
• Since the crankshaft met with an accident, all the crankpins were subject to crack detection by MPI. No cracks or abnormality was found in any of the five crankpins.
• On visual inspection radius filled profile was found damaged.
• Deflection of crankshaft was checked and was observed within limits.

Crankshaft Grinding:

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 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 its dificult to accommodate the grinding tool on the crankpin. The old and leading grinding companies based in Europe and UK do not have the facility and equipment to grind the crankpin having 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 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 small bearing width. The damaged engine block was repaired by metal stitching and metal locking process and was saved from rejection. The engine after repairs is performing satisfactory.

RA Power Solutions is the only company in the asian continent providing onsite crankshaft repair for the smaller crankpin width of even 40 mm. For further details, you may contact us on rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 or  +91 9810012383.