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Heavy Marine Machinery

Crankshafts &
Engine Blocks

Sourcing the heart of your vessel. We stock reconditioned crankshafts, connecting rods, and piston crowns for MAN B&W, Wartsila, and Yanmar engines.

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Supported Engine Makes

ABB MAN B&W Mitsubishi Wartsila Daihatsu
Engineering Excellence

Critical Spares for Critical Timelines

When a main engine fails, the cost isn't just the spare part—it's the demurrage, the off-hire, and the reputation of the ship manager. Welcome Marine specializes in the rapid deployment of heavy engine components. We don't just "store" crankshafts; we maintain them in a state of readiness.

Our proximity to Alang allows us to secure low-running-hour engines from vessels that are being retired due to age limits or market conditions, not mechanical failure. This means we often source standard-size crankshafts and liners with 80%+ remaining lifecycle.

Crankshaft Reconditioning Protocol

  • 1. Deflection & Run-out Analysis: Before removal from the vessel, we measure web deflections to ensure the shaft hasn't been stressed. In the workshop, we check run-out on V-blocks to 0.01mm accuracy.
  • 2. Magnaflux (MPI) Testing: Every journal and pin is subjected to Magnetic Particle Inspection to detect surface and sub-surface micro-cracks that are invisible to the naked eye.
  • 3. Hardness Testing: We verify that the journal hardness is within OEM limits (typically 250-300 HB) to ensure compatibility with new bearings.
  • 4. Polishing & Lapping: Journals are polished to a mirror finish (Ra < 0.2) to ensure optimal oil film formation and reduce bearing wear.
  • 5. Class Certification: For all major components, we invite surveyors from Class NK, Lloyds, or BV to witness the final dimensional inspection and stamp the component.

"A reconditioned standard-size crankshaft is often superior to a new undersize one. It retains the original structural integrity designed by the manufacturer."

Standard Size Guarantee

We prioritize sourcing crankshafts that are still at "Standard" diameter, giving you maximum lifespan before grinding is ever needed.

Complete Engines

Need a full Auxiliary Engine replacement? We stock complete Yanmar and Daihatsu gensets, load-tested and ready to install.

Air Freight Capable

We have specialized crating partners to air freight heavy items (up to 5 tons) to major airports like DXB, AMS, and SIN.

Featured Engine Spares

Crankshafts, Liners, and Pistons ready for dispatch.

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Find Your Engine Part

We stock parts for over 50 different engine models. Use our search tool to find by Part Number or Engine Type.

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Engine Spare FAQs

Technical questions from Chief Engineers.

90% of our stock is Standard Size. We specifically select engines that have not undergone grinding. However, we also stock some undersize shafts (0.5mm / 1.0mm) for specific older models where standard is unavailable.
Yes. For critical items like Crankshafts, Connecting Rods, and Engine Blocks, we can arrange for a Class Surveyor (NK, Lloyds, BV, RINA) to witness the inspection and issue a certificate before dispatch.
Yes. We regularly export complete gensets (Yanmar 6N18, Daihatsu DK-20). We skid-mount them on steel beams, wrap them in VCI foil, and ship them in Open Top containers or Flat Racks.