Genuine & OEMMarine Spare Parts

Component overhaul, testing, calibration, and return-to-service preparation.

Technical support for main engines, auxiliary engines, troubleshooting, and dry docking.

Contact Dieselmech Group for part numbers, availability, compatibility, and delivery support.

A MAN B&W main engine overhaul normally includes planned dismantling, inspection, measurement, cleaning, reconditioning, renewal of worn parts, reassembly, testing, and documentation. Measurement limits must always be checked against the specific engine instruction book and service bulletins.

A marine diesel engine piston overhaul checks piston crown condition, ring grooves, piston rings, skirt contact, cooling spaces, piston rod or pin connections, deposits, cracks, wear patterns, and critical measurements. The objective is to decide whether the piston can be reused, reconditioned, or must be renewed according to the applicable engine-specific maker criteria.

Connecting rod inspection verifies the rod body, big-end bearing housing, small-end bush where applicable, bearing shells, crankpin, fasteners, lubrication path, mating faces, alignment, and recorded measurements. Bearing checks focus on clearance, crush and seating evidence, overlay condition, wiping, scoring, fatigue, embedded particles, overheating, fretting, oil supply, and the root cause of any abnormal wear.

Marine engine main bearing inspection evaluates the bearing running surface, shell back, seating, clearance, oil supply, temperature trend, crankshaft main journal condition and related crankshaft-deflection history. Main bearing wear patterns such as wiping, scoring, embedded particles, overlay fatigue, edge loading and fretting must be interpreted with lubrication condition, journal geometry, alignment, bedplate support, foundation condition and operating history before deciding repair or renewal scope.