MAN Diesel Generator Model no. 9L28/32

Product Description

The make, model of Engine and crankshaft details are given below:

Repair of MAN Engine Model no. 9L28/32 Diesel Generating set Crankshaft

RA Power Solutions deputed two technicians along with an onsite crankshaft grinding machine and technicians boarded the vessel at port of Jebel Ali Dubai. On conducting the inspection following are the main observations of the crankshaft of MAN Engine Model no. 9L28/32 diesel Generating sets.

i) It was observed that the crankpin no. 3 of the AE#02 was damaged. The Bearing material was embedded on the crankpin diameter. After removal of the white metal from the crankpin, the dimension inspection was done and following was observed:

    a) Minimum crankpin diameter observed:  229.44 mm

   b) Maximum crankpin diameter observed:  229.83 mm

The above readings were observed against the standard diameter of 230.00 mm.    

ii)The radius fillet and lubricating oil hole profiles were found acceptable with no damage.

iii) Deep Bearings line marks were observed on the remaining 8 numbers of crankpins. 

iv) All the crankpins were subject to hardness test and crack check by MPI method and no abnormality was observed.

v) All other parameters were observed within limits. 

Successful Crankshaft Repair of MAN Engine Model no. 9L28/32

i) The grinding of crankpin no. 3 was initially undertaken to the undersize of 1.0 mm maintaining the crankpin diameter of  229.00 mm. Since the Bearing line marks were still visible it was decided to grind further. The final size maintained after grinding and polishing was 228.50 mm which is 1.5 mm undersize. 

ii) Considering the rough surface finish and bearing line marks all the remaining crankpins were polished while using the state of art crankshaft grinding & polishing machine using the latest polishing media. 

iii) The surface finish of less than 0.20 RA value was maintained. 

iv) The ship had the 1.5 mm undersize bearing available which was assembled and the engine was put on load.