Journal Machining

Journal Machining

Shaft journal and journal repair form a large part of In-Situ Machining Solutions (UK) Ltd’s on-site machining portfolio. It has helped us achieve a global reputation as industry-leading shaft journal and journal machining specialists.

Journal Repair

Rotating equipment can sustain damage due to oil starvation and major seizure. In-Situ have purpose-built orbital equipment and machining techniques to provide a quality and professional service, and thanks to our speciality in on-site journal repair, we can deploy it worldwide. In addition, our on-site machining engineers are highly trained, skilled and experienced in journal turning, grinding, superfinishing and polishing on-site.

The advantage of utilising specialist teams of Engineers deployed by In-Situ and our orbital turning, grinding, superfinishing and polishing systems designed and developed in-house alleviates the necessity of removing the rotating component from its housing casing or stator to repair damage to the main bearing journal or the separate bearing or journal surfaces.

In addition to the renowned diesel engine crankshaft repairs that In-Situ Machining Solutions (UK) Ltd offer, the company also provides customers with the facility to refurbish large damaged rotating components to OEM standards on-site and anywhere in the world.

Journal Machining Process

Failure Assessment & Inspection

The process includes multiple services in which the Crankpin Journal’s condition is assessed. This allows a plan to be put in place for Crankpin machining operations. The program may include all or some of the following services:

  • Crack Detection
  • Hardness Testing
  • Geometric Tolerance Checks
  • Run Out Checks and Exploratory Grinding.


A specially manufactured machine is utilised to machine the Journal to remove any damage or wear and restore OEM specified tolerances to the diameter, radii and any seal/wiper areas


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 Journal after the machining process


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

Additional Services If required


Journal Turning

The shaft journal and journal machining process cannot be rotated in most circumstances, but this is not the case with our team. If space allows, In-Situ offers a Journal turning service in which the Shaft can be rotated by a bearing gear (or a variable speed bearing gear can be designed and supplied by In-Situ) and turned in a conventional manner.

In-Situ can design and manufacture specialist fixtures to mount a tooling slide alongside the journal and conduct the journal machining as it rotates at the desired speed.


Heat treatment

Annealing the journals can be undertaken to reduce heat-induced hardness within the journal 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 affected journal with ceramic blankets is undertaken.

If you feel your machine maintenance could be assisted with any of these services, please use the enquiry form below to get in touch with our team today. We can also answer any questions you might have about how our on-site machining can help your business.

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    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

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