🛠 In-Situ Crankshaft Journal Restoration Using In-House Engineered Grinding Tool – No Engine Dismantling Required - Ship Repair Bangladesh


Crank Shaft Grinding & Repair At Bangladesh


At Veins Marine Engineering Solution (VMES), we specialize in high-precision marine engineering services that reduce downtime and cost for vessel operators. Our latest breakthrough involves the complete in-situ restoration of a damaged crankshaft journal—executed without any need to dismantle or remove the crankshaft from the marine diesel engine.

This achievement highlights VMES's core strengths: innovation in field machining, custom tool development, and deep technical expertise in marine propulsion system repairs.

⚓ Project Summary: Addressing Critical Crankshaft Damage Onboard

A main propulsion engine onboard a merchant vessel experienced a critical failure of one of its crankshaft main journals. The failure included:

  • Deep scoring and cracks on the journal surface

  • Journal ovality beyond class tolerance

  • Associated wear in the big-end bearing and connecting rod

Normally, this type of defect necessitates full engine dismantling, crankshaft removal, and workshop-based machining. However, due to logistical constraints, tight turnaround requirements, and cost concerns, the shipowner requested a reliable onboard solution with class-compliant results.

🔧 VMES Engineering Solution: Advanced In-Situ Crankshaft Repair

🔹 Step 1: Technical Inspection & On-Site Assessment

Our marine engineers carried out a complete onboard diagnostic using:

  • Laser alignment tools

  • Dial gauges for runout

  • Ultrasonic crack testing

  • Journal hardness checks

The crankshaft was declared repairable by in-situ machining, with agreement from the vessel’s classification society.

🔹 Step 2: In-House Fabrication of Specialized Grinding Tool

VMES designed and built a precision crankshaft journal grinding tool in-house. Features included:

  • Rigid mounting frame adapted to crankcase geometry

  • Adjustable journal diameter feed

  • Cross-slide and axial feed systems for high surface finish control

  • Electric drive with variable speed settings

  • Cooling system for thermal control during grinding

🔹 Step 3: In-Situ Machining Execution

The crankshaft journal was machined with the following specifications:

  • Target undersize: -1.00 mm (based on bearing availability)

  • Surface finish: Ra < 0.3 µm

  • Roundness tolerance: < 0.02 mm

  • Axial alignment: Checked using straightedge and blueing method

  • Total machining time: 18 hours (over 2 days)

🔹 Step 4: Bearing Integration & Alignment

Once grinding was complete, OEM-approved undersize bearings were sourced and installed. The connecting rod was also reconditioned to align with the journal’s new dimensions.

Post-installation, the following checks were conducted:

  • Oil clearance verification

  • Lubrication system integrity

  • Engine barring and crank angle measurement

  • Vibration analysis during trial run

🧰 Key Results Delivered

MetricOutcome
Engine dismantlingNot required
Workshop supportNot required
Downtime savedApprox. 10–12 days
Cost savings65–70% vs traditional method
Class survey approvalAchieved onsite
Engine restartWithin 48 hours post-repair

This solution ensured complete mechanical restoration of the crankshaft's functionality, maintaining engine performance and avoiding voyage delays.

🌐 Why VMES In-Situ Services Stand Out

VMES is one of the only marine service providers in Bangladesh capable of delivering class-approved crankshaft journal grinding services onboard—without dismantling. Our capabilities include:

  • In-situ journal grinding (main & crankpin)

  • Line boring & bush replacement

  • Connecting rod re-machining

  • Main bearing saddle alignment

  • Engine block dimensional inspection

  • Crankshaft deflection and runout testing

We provide 24/7 emergency mechanical response to vessels calling at Chittagong, Mongla, Payra, and Matarbari ports.

🚢 Your Trusted Partner for Marine Diesel Engine Repairs

With in-house engineering, full tool fabrication capability, and class-certified execution, VMES delivers world-class mechanical solutions at your dockside. Whether it’s a routine overhaul or a critical breakdown, our team is equipped to respond with speed, skill, and compliance.

📍 Office Address: 1st Floor, M R Dovas Lane, 148 Sadarghat Road, Chittagong, Bangladesh
📞 Phone: +8802333355478
📱 WhatsApp/WeChat: +8801812381384
📧 Email: technical@vmesbd.com | supply@vmesbd.com | td-eharam@vmesbd.com
🌐 Website: www.vmesbd.com

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