Crankshaft Repair, Crankpin Straightening & Heat Treatment

The Metalock Engineering Group provides cost-effective crankshaft repairs involving re-machining, straightening and heat treatment services for all types of large diesel engines, at sea or on land anywhere in the world.

Lloyds Accreditation

In accordance with the requirements of Lloyd's Register Metalock UK have been awarded the Lloyds accreditation (No MNDE/REP/0073/03) for the “In-Situ” annealing and re-machining of crankshafts installed in marine or land-based diesel engines.

Emergency crankshaft failure repairs

Crankshaft failure can happen at any time, even on the best maintained engines, however it always happens at the most inconvenient time and always results in expensive downtime and loss of revenue - that’s why Metalock is here to help.

We have highly skilled orbital machining specialists located in all of our global service centres that can respond quickly to any emergency situation involving crankshaft failure, if there is any damage caused by the failure on the structure of the engine block we also can provide specialist cold Metalock repair technicians to repair the cracked components at the same time. All repair work is covered by Lloyds Class Approval.

Heat Affected Crankpins Journal Diameters

You may or may not require the annealing process, however, it has been developed at the request of many customers. The aim is to reduce the hardness of damaged or heat affected crankpins journal diameters. The application is limited to one-piece forged crankshafts made of tempered steel that has not been surface hardened by induction hardening or nitriding.

Before heat treatment is undertaken the material specification, ideally, including the tempering process, must be known so as to ensure the annealing temperature used does not exceed that of the original tempering. After annealing the surface hardness of the annealed area must be within the range given by the original engine manufacturer.

Machining of crankpins

All crankshaft re-machining is in accordance with our Metalock Engineering process description ‘Machining of crankpins’ and is to result in satisfactory surface finish within the original engine manufacturer tolerances. Final inspection includes magnetic particle inspection, surface hardness, dimension, run-out, surface finish and crank web deflection.

All readings reported and recorded for our customers quality records.

On Land, in Dock or at Sea

On land, at dockside or mid-ocean, Metalock skilled orbital machining technicians regularly help customers avoid the cost and inconvenience of back-to-workshop repairs. When every minute of downtime means lost revenue, in situ repair and maintenance services get the engine back into service as soon as possible.

• Crankshaft repair
• Crankshaft straightening
• Crankshaft heat treatment
• Crankshaft journal repair
• Crankpin heat treatment
• Crankshaft regrinding
• Crankshaft machining
• Crankshaft polishing
• Orbital crankpin machining/regrinding
• Main bearing machining
• Main bearing regrinding
• Main bearing journal polishing/superfinishing

The Benefits of Trusting Metalock

From marine propulsion to industrial power generation, our crankshaft reconditioning and crankpin machining service gives you valuable benefits:

• 24/7 global crankshaft/crankpin services – call us for support.
• A proven, solution-focused approach.
• Save money and time when it really counts.
• Avoid premature capital expenditure for engine replacement.
• Extend engine service life with damaged crankpin repair.
• Providing workshop quality service on site, in dry dock or at sea.
• One reliable source for these and many other specialist engineering services.

Imagine the Cost of Traditional Workshop Repairs

Just imagine the time and costs involved in a traditional back-to-base repair:

• Stripping the engine
• Removal of the crankshaft
• Transport to a machine shop
• Regrinding or another repair
• Return transport to site
• Reinstallation
• Engine rebuilding
• Testing and commissioning

All the time the engine will be out of service and not making you money. Now, imagine the benefits of our cost-effective in situ repair (in place, on site or aboard ship), including minimised downtime and avoid expensive and untimely replacement costs. That’s why Metalock makes sense every time.