What you need from an engine overhaul

Regardless of whether you need an engine overhaul because of hours, time, or it is unplanned you need to know it is done right.

The first consideration is the content of the overhaul. Is it just a top-end, major overhaul, half-life or to rectify damage after a failure?

Next, is where the work is to be carried out? Ideally, this would be in a fully equipped workshop like ours, but sometimes this is not logistically possible or practical.

For site overhauls, swing engines or swing assemblies can be a great way to reduce timescales and costs.

When we are carrying out overhauls, they follow our 9 stage process, each one is outlined below:

1. Dismantle

The following SOP is followed during the engine dismantle stage:

  • Ensure the engine is drained of all fluids
  • If drained oil is available check for metallic residue
  • Mark the engine wiring harness
  • Remove Engine subassemblies (Turbocharger, Governor, Starter motor etc) and set aside
  • Remove engine from mountings and place on supporting frame or a turnover frame
  • Remove flywheel
  • Mark up alignment of free-end and driven-end gears
  • Remove front end and driven end gearwheels
  • Remove Exhaust and Intake manifolds
  • Remove coolant rails
  • Remove fuel pipes
  • Bar the engine over so the piston of the required cylinder is at TDC
  • Remove cylinder head covers
  • Remove rocker gear and injectors
  • Remove pushrods
  • Remove cylinder heads
  • Remove pistons and connecting rods
  • Remove cylinder liners
  • If possible, rotate the engine to give easy access to the crankshaft
  • Remove bottom of crankcase
  • Remove main bearing caps, crankshaft and camshaft

2. Clean

All items are thoroughly cleaned in our workshop by engineers manually, and using our ultrasonic cleaning, paint stripping and parts washing tanks and Guyson bead blaster.

3. Inspect

Each part of the assembly is inspected to ascertain if it is good condition, in need of replacement, machining or other work to bring it back to OEM specification.

4. Report & Approval

All workscopes we complete include a fully comprehensive report after stage one detailing our findings and recommended plan of action, along with cost and time implications.

Once we have your approval, we will progress the overhaul.

You will also receive updates as we progress through each stage.

This ensures you know exactly what stage we are working on, and have the peace of mind that all steps have been documented for your reference.

5. Replace

Where a replacement is the only option for any of your components, we can source directly from OEM and component manufacturers.

As an established business we have direct links to OEM and original component manufacturers and can offer fast turnaround times at great prices.

We are also dealers for MTU, Baudouin and Bosch, so can guarantee preferred rates and lead-times.

6. Refurbish

With our in-house manufacturing and machining capabilities, we are able to offer alternative solutions rather than just replace.

All these repairs would be covered by a 12-month warranty and comply with OEM specifications or industry standards.

This can provide a more cost-effective and quicker option than replacements.

7. Build

The following SOP is followed during the engine rebuild stage:

  • Install camshaft and check end float
  • Fit crankshaft and place Plastigauges on crankshaft main journals
  • Install new main bearing shells, and torque to OEM spec. Ensuring bearing shells match up with crankcase.
  • Remove bearing caps and inspect Plastigauges
  • Lubricate crankshaft & bearings and torque to OEM spec.
  • Measure end float and check free rotation of the crankshaft
  • Fit bottom of crankcase/sump to engine
  • Fit front end and driven end gearwheels
  • Rotate engine to insert cylinder liners
  • Check liners for ovality to ensure fitted correctly
  • Pressure test crankcase
  • Insert pistons and connecting rods
  • Mark connecting rod ends when torqued up
  • Fit cylinder heads with new gaskets
  • Bolt down cylinder heads, increasing torque setting in stages up to OEM spec. (ie torque all bolts to 1/3 OEM value, then 2/3, then 100%)
  • Check the bumping clearance of each cylinder
  • Fit rocker gear and injectors
  • Fit cylinder head covers
  • Fit inlet and exhaust manifolds
  • Fit coolant and oil lines
  • Fit fuel lines
  • Fit flywheel
  • Fit engine subassemblies (Turbocharger, Governor, Starter motor etc)
  • Final Assembly
  • Fill engine with fluids and check for leaks
  • Rotate crankshaft two full rotations
  • Fit engine guards

8. Test

On completion of the overhaul, the engine will be tested against an agreed test plan and can be witnessed by you, a representative or live streamed.

Once accepted, the engine can be packaged and shipped back to the site or stored in our warehouse, ready when needed.

Our engineers can then attend to re-install and commission, checking alignments and test running on site.

9. Final Report

On completion of the overhaul, a full report including all stages will be provided, along with our 12-month warranty as standard.

For an example of an overhaul report, click here.

If your engine is in need of an overhaul that you can count on, fill in your details below – we’d be happy to Help.

Contact Bartech

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“Thank you.

The site report and the overhaul at site have been conducted to a high standard.

Well done.”

Wood Group Asset Management Solutions

What were you most impressed with working with Bartech?

“A genuine open and honest customer focused approach.

A willingness to evolve and support ongoing learning (both ways) when things may not quite go as planned or expected. Whilst the whole Bartech team are focused and engaged Rob Lee has proved to be a pivotal contact point for EDF addressing and resolving concerns that may arise.”

Mark Bradbury ~ EDF Hartlepool

How could we have improved your experience with Bartech?

“Nothing as the experience was excellent.”

Peter Reynolds ~ Generator Power Systems DDGC

“We have a long term service agreement with Bartech so putting together the work scope was made easy as we have worked with them in the past and know how they work in a professional matter.

All the organisation and spares were taken care of by the project engineer, once this was ready Bartech and CNR had a conference call with the platform to discuss the scope and iron out any issues that may arise during the scope and controls were put in place to prevent issues arising.”

Alan Farquhar ~ CNR Ninian Central Platform

“Please pass on my thanks to your team for the fantastic effort in getting this rearranged visit complete.

We had constraints on labour and lead time of equipment however all went seamlessly.

Please also pass this on to Matt and William and thank them for their workmanship whilst offshore, very much appreciated by all here at Fairfield.”

Martin Baxter ~ Fairfield Energy

How did working with Bartech benefit you / your company on this project?

“Bartech offered a speedy and effective response to an urgent repair required for our firewater pump clutch allowing wells operations to commence as planned.

Bartech were flexible to meet customer requirements, committing to weekend working to allow fast turnaround on component repair… significantly reducing turnaround time in comparison to OEM replacement option”

What were you most impressed with working with Bartech?

“Dedication to meeting requested delivery on an extremely tight turnaround.”

Natalie Jackson ~ Shell

If you’re after a trustworthy engine specialist with an excellent track record for your job then let's get started

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