Bergen Rolls Royce Crankshaft Repair- Rapower Solutions

by RA Power Solutions RA power solution

We were approached by our old client who informed about the damage to the crankshaft of Bergen Rolls Royce make of Engine model C 25:33 L9P.

The Detail of Engine,Crankpin diameter and bearing width are mentioned below in the box:

S. NO	Crankshaft Details
1	Engine Make	Bergen Rolls Royce
2	Engine Model	C 25:33 L9P
3	Crank pin Diameter Standard	230 mm
4	Crankpin Bearing Width	92 mm
5	Place of execution of crankshaft repair	Mumbai Port, India

Action taken by RA Power Solutions to Repair Bergen Rolls Royce Crankshaft Model no. C 25:33 L9P

i) Before the arrival of our two technicians and boarding on a vessel at Mumbai Port India, the ship staff removed all the connecting rods.

ii) On visual inspection one number of crankpin was observed damaged having standard diameter of 230 mm and crank pin bearing width of 92 mm.

The minimum & maximum reading of crank pin was observed as following:

a) Minimum diameter observed- 229.61 mm

b) Maximum diameter observed- 229.93 mm

Against the standard diameter of 230.00 mm the ovality of 0.32 mm was observed which is considered to be very much on the higher side. Deep bearing line Mark’s and rough surface was observed.

iii) All other crankpins were also subject to dimensional inspection, taper & ovality was observed within limits. Only the Bearing line marks were observed.

iv) As a routine inspection the hardness of crankpin was inspected and was observed within limits. The crack detection was also undertaken by MPI and no crack was observed.

v) The grinding of one number of crank pin was undertaken maintaining the final size of 229.00 mm with undersize of 1.0 mm.

vi) All other crankpins were polished for removal of bearing line marks. After polishing the surface finish of better than 0.15 RA Value was observed.

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