Contact us at

Our 24×7 Helpline

+1 866 398 2788

Contact us at

Our 24×7 Helpline

+1 866 398 2788

In-situ Machining

Whenever a worn-out or damaged machinery component is too large to be brought to a machine shop, or when doing so involves too much dismantling work and thus is too time consuming and costly, then the solution is to bring the machine tools to the site. This is what in-situ machining is all about.

For several years, QuantiServ has been supporting machinery owners and operators from various industries such as marine, energy, petrochemical and oil and gas, to name a few, with cutting-edge in-situ machining services.

In twelve locations across the globe we have highly trained engineers who are able to respond and travel to a site within hours.

Click on one of the links below to learn more about how QuantiServ can help you to repair your equipment fast, economically and reliably.

Case Study


The timeline below shows, in chronological order, the individual steps that make up a comprehensive repair. It is an example of a typical repair assignment, carried out by two specialists from QuantiServ Sweden en route in South America at the end of 2020. Their task was to repair a crankpin bearing failure.

The subject of the repair was a 32 cm bore, 40 cm stroke auxiliary engine installed on a 5-year old 9’200 TEU container vessel. The customer asked us to carry out an inspection on board, which we did. He then decided to award the repair work to another company. That company commenced the repair, machined 0.80 mm off from the pin and then walked away from it, unable to continue. So the customer came back to us.


  • 29.09.2020 - Service Enquiry

    We receive the service enquiry from the ship owner’s office

  • 30.09.2020 - Repair Proposal

    The following day, we submit to the customer an offer for an inspection on board

  • 08 - 09.10.2020 - Inspection

    A specialist from QuantiServ Panama carries out a comprehensive inspection on board the vessel in Panama. The inspection takes two days.

  • 13.10.2020 - Repair Proposal

    Based on the results of the inspection, we submit a repair proposal to the customer.

  •  - Competitor Starts and Then Abandons Repair

    The customer awards the work to a well-known competitor of ours. The company machines the damaged crankpin to – 0.80 mm and then abandons the work due to their technical inability to complete the repair.

  • 24.11.2020 - Customer Comes Back to Us

    The customer comes back to us and asks us if we could finish the repair that was started by the other company. We agree and start to pack the tools and mobilize our specialists.

  • 10 - 13.12.2020 - Engine Dismantling Work

    Our repair plan foresees that all repair work is to be done during the voyage. Two specialists from QuantiServ Sweden board the vessel in Lima. First, they partly disassemble the engine to enable the repair. This takes 4 days.

  • 14 - 16.12.2020 - In-situ Heat Treatment

    The bearing failure has caused an unwanted increase in the crankshaft’s hardness. In-situ heat treatment solves this problem. It reduces the hardness from a maximum of 620 HB to a maximum of 255 HB and takes three days.

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  • 17. - 21.12.2020 - Crankpin Rough Machining

    Cracks are found in the pin. We machine them out and carry out MPI crack testing repeatedly. This takes four days.

  • 22.12.2020 - Straightening (Peening)

    The bearing failure induced a lot of heat into the crankpin, causing the crankshaft to bend. We measure a run-out of 0.27 mm. In-situ peening reduces this to just 0.03 mm. It takes one day.

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  • 23. - 25.12.2020 - Crankpin Finish Machining

    Accurately finish machining the pin to a diameter of – 3.00 mm takes three days.

  • 26. - 28.12.2020 - Polishing

    The next step after in-situ machining is machine polishing to achieve a mirror-like surface finish. Several crankpins and two main bearings get polished. This takes three days.

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  • 29.12. - 05.01.2021 - Engine Overhaul and Assembly

    Assisted by the crew, our two specialists undertake overhaul and reassembly works for six days.

  • 05.01.2021 - Assignment Completed

    Our specialists successfully complete the assignment and disembark from the vessel in Mexico.

29.09.202030.09.202008 - 09.10.202013.10.202024.11.202010 - 13.12.202014 - 16.12.202017. - 21.12.202022.12.202023. - 25.12.202026. - 28.12.202029.12. - 05.01.202105.01.2021


The repair of the damaged crankpin took eleven days to complete. Polishing of all six other crankpins and some main bearings took a further five days. The customer was very happy with the performanace of our two specialists and wanted them to lead the overhaul and engine reassembly until the spare parts available on board ran out and the work had to be stopped. All in all, our specialists worked on board for 25 days, from Lima, Peru, to Manzanillo, Mexico.

The customer was so happy with our performance that he asked us to supervise an overhaul of a similar engine on one of his sister vessels.


Damaged crankpin, prior to repair
Close up of the damaged crankpin, prior to repair
Severely damaged crankpin bearing shells
Severely damaged crankpin bearing shells
MPI test indicating a crack about 25 mm long
MPI test indicating a crack about 25 mm long
Close up of the crack
Close up of the crack that is visible by naked eye
In-situ heat treatment (annealing) to reduce hardness
In-situ heat treatment (annealing) to reduce hardness
The crankpin after heat treatment (annealing)
The crankpin after heat treatment (annealing)
During machining of the crankpin. Now at a diameter of 338.80 mm (- 1.20 mm undersize)
During machining of the crankpin, at a diameter of 338.80 mm
The completed crankpin, oiled up for corrosion protection
The completed crankpin, oiled up for corrosion protection


crankshaft grinding

Crankshaft Machining and Polishing

QuantiServ’s in-situ technicians have decades worth of experience and are able to carry out any in-situ machining or polishing job fast, reliably and economically.

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crankshaft straightening

Crankshaft Straightening

As a consequence of severe overheating, a crankshaft – or indeed any shaft – may become bent. In many cases QuantiServ is able to straighten such a shaft in place without the need to dismantle it.

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heat treatment

Heat Treatment (Annealing)

Local hard spots on the running surface are often created when a rotating shaft or crankshaft overheats. They are usually not permissible and have to be eliminated through in-situ heat treatment/annealing.

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Laser Alignment

Alignment by laser is a very versatile, fast and accurate method. It ensures that critical parts, such as shaft lines and couplings, are perfectly aligned and will not wear out or fail due to vibrations or excessive stresses.

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Line Boring

At QuantiServ we designed and built our own, very advanced portable machines that enable us to line bore any kind of equipment in almost any location. This greatly reduces dismantling time, saving precious time and money.

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installation of sleeves and bushes

Installation of Sleeves and Bushes

QuantiServ excels in the fast  and reliable installation of any kind of repair bush. A common example on four-stroke engines is to permanently stop jacket cooling water leaking into the crankcase by installing a repair bush in the engine block.

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Flange Facing and X-Y Milling

Most of the flange facing and Y-Y milling machines that we use were designed and built by ourselves. These machines are very advanced and very compact, to reduce freight costs and to be able to work in very tight places.

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