Crankpin Machining and Repairs

Crankpin Machining and Repairs

In-Situ Machining Solutions (UK) Ltd are world leaders in on-site Crankpin repairs, offering an expert machining service undertaken by highly trained and motivated teams of engineering specialists. In-Situ can support clients during planned maintenance or emergency breakdown situations relating to the refurbishment of crankshafts, crankpins and main bearing journals, on land, on board sea going vessels and off-shore anywhere in the world. 4-Stroke Engines, 2-Stroke Engines and Compressor shafts are all areas in which In-Situ are world leaders and offer an unrivalled service. Vast experience gained through innovation, investment, R&D and field trails allow In-Situ to undertake the most complex crankshaft machining projects in the shortest time possible.
..Our specially designed and manufactured orbital turning, grinding, superfinishing and polishing machines cover all forms and sizes of crankpins (big end/large end) up to 1.2m in diameter, ensuring that repairs can be undertaken in environments with limited space constraints, extreme environmental conditions or also within limited timeframes. Damage to crankpins can vary in severity depending upon a variety of factors. Removing heat induced hard surfaces as high as HB 750 via a combination of machining techniques and an on-site annealing process, together with the reforming of damaged fillet radii and peen straightening of bent crankshafts, allow In-Situ to remain a global industry leader in this diverse engineering sector. Our advanced orbital machining, grinding, superfinishing and polishing service is offered to all sectors of industry including, Power generation, marine, steel production, petrochemical, offshore oil & gas, transportation, food production and defence. We work closely with OEM’s achieving the high tolerance demands required by these manufacturers.

Crankpin Machining Grinding

Failure Assessment & Inspection

The process includes multiple services in which the severity of a failure or condition of the Crankpin Journal is assessed. This allows a plan to be put in place for machining operations to take place. The process may include all or some of the following services: Crack Detection, Hardness Testing, Geometric Tolerance Checks, Run Out Checks and Exploratory Grinding.

Machining & Grinding

A specially manufactured Machine is utilised to machine or grind the Crankpin diameter to remove any damage or wear and restore OEM specified tolerances to the journal, radii and oil holes.


A process in which a specialist piece of equipment holding a carborundum stone oscillates from side to side around 30 times a second to flatten off the surface of the Crankpin/Journal after the machining process.


Machine polishing process to ensure flatness and other geometric tolerances are maintained whilst producing the OEM specified surface finish.

Additional Services

Heat treatment

Annealing of the Crankpins can be undertaken to reduce heat induced hardness within the journal that is above OEM specification. This service is undertaken via a resistance heat treatment method in which a process of controlled heating, soaking and cooling of the effected Journal with ceramic blankets is undertaken.

Peen Straightening

Peen straighten is a specialist method used as a means of stress relief to help reduce any bends within the shaft due to failure. The process uses a peening hammer to strike the Journal to release stresses from the affected area resulting in reduction in bend/runout.

Relatable Industries

We work across several different industries and we provide a 24/7 worldwide service for our clients.
Oil & Offshore
Marine & Ship Building
Mining & Machinery
Power Generation

Get In Touch With Our Team Today
Office Contact Details: +44 (0) 1788 572777
Out Of Office: Dan +44 (0) 7398 231720 Mick +44 (0)7876453285

© Copyright In-Situ Machining Solutions 2021

Contact Us