Cummins 4BT3.9 - service and repair
Diagnostics, major repairs and parts for 4BT3.9. Door-to-door pickup throughout Poland. Testing on the stand and a warranty of up to 12 months. We service machines such as: JCB 3CX/4CX, JCB Telehandler, Manitou, CASE, New Holland, Bobcat, Terex, Hyundai, Doosan, Hitachi, Komatsu, Volvo CE, Sany, XCMG and CUMMINS Power generators.
- Original parts
- Dynamometer test report after repair
- Short lead times
- Technical support and replacement selection
Contact form
Typical symptoms of internal combustion engine damage
For Cummins 4BT3.9, common reasons for service visits are: blow-by and loss of compression, injector and injection pump wear, cooling system leaks, cracked exhaust manifolds, turbocharger wear, and bearing noise. If your excavator, telehandler, or generator with 4BT3.9 is losing power or smoking, contact WIBAKO.
Power loss
The engine has trouble reaching nominal RPMs, and the machine loses power under load.
Excessive smoking
Black, white, or blue smoke from the exhaust indicates problems with the fuel system, turbocharger, or engine component wear.
Unusual noises
Knocking, rattling, or metallic sounds may indicate bearing, piston, or valve wear.
Vibrations and overheating
The engine runs unevenly, shakes, and the operating temperature rises quickly - these are signals of cooling system damage or mechanical component failure.
What we do as part of the service
Diagnostics & tests
Pressure measurement, flow tests, test bench verification.
Overhaul
Replacement of rotating elements, seals, surface finishing.
Calibration
Precise adjustment of valves and controls.
Upgrades
Selection of replacements and adaptations.
Door-to-door
Pick-up and delivery throughout Poland.
Warranty & report
Test protocol and warranty up to 12 months.
Cummins 4BT3.9 - what we repair
- Complete repairs of 4BT3.9: block, head, crankshaft, sleeves, pistons, bearings, timing system.
- Reconditioning of turbochargers, injectors, and injection pumps (mechanical and electronic).
- Sealing of systems: cooling, lubrication, intake, and exhaust.
- Pressure tests, leak tests, compression measurements, fuel system calibrations.
- New and reconditioned parts for 4BT3.9: repair kits, gaskets, oil and water pumps, thermostats, belts, tensioners.
Brands and types of machines we service: wheeled and tracked excavators, loaders, telehandlers, bulldozers, articulated loaders, rollers, platforms, and lifts. Manufacturers: JCB, Manitou, CASE, New Holland, Bobcat, Terex, Komatsu, Hitachi, Volvo CE, Doosan, Hyundai, Sany, XCMG, Genie, Wacker Neuson, Atlas Copco (power supply), as well as CUMMINS Power generators.
WIBAKO provides pickup and delivery after repair, documentation from tests, and a clear estimate before starting work.
What the repair process looks like
Contact
By phone or via the form.
Collection
We arrange a courier; on-site disassembly possible.
Diagnostics
Disassembly, measurements, cost estimate for approval.
Repair & test
Assembly, calibration, test bench verification.
Why it's worth servicing 4BT3.9 at WIBAKO
- Wide stock of parts for 4BT3.9 - we reduce downtime.
- Test stands and quality control after each repair.
- Warranty of up to 12 months and after-sales support.
Customer reviews
Quick pickup, repair, and tests - the machine returned to work without smoking. - Krzysztof
Stable RPMs under load, fuel consumption decreased. I recommend. - Tomasz
Estimate before work, then no surprises. Warranty for 12 months. - Paweł
FAQ - frequently asked questions
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#1.Where to start?
The first step is to contact Łukasz, our coordinator for internal combustion engine repairs. You can call +48 33 870 42 15 or use the contact form available on our website.
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#2.How to deliver a combustion engine for repair?
You have several convenient options to choose from:
- Personal delivery to our workshop.
- Sending the engine by courier.
- We can also arrange for a courier to ship the engine on a pallet from a specified location, and after the repair service is completed, the courier will deliver it back.
- If you lack the appropriate facilities for disassembly or assembly, our mobile service can come to you and perform these services on-site. -
#3.How does the engine repair process proceed?
Our engine overhaul process is thorough and transparent:
- Detailed verification: the engine is disassembled down to the "last screw" and subjected to a detailed verification.
- Cost estimate and schedule: we prepare a comprehensive cost estimate and determine the expected repair time.
- Major overhaul: upon your acceptance of the terms, we proceed with a comprehensive repair, which is always a major overhaul, not just a replacement of individual components.
- Testing and painting: The overhaul is completed when the engine successfully passes tests at the engine dynamometer station. The final stage is professional engine painting. -
#4.What will you find in our offer?
We always strive to present you with the most beneficial solutions, therefore depending on the availability of spare parts you will receive:
- An estimate for repair with original parts.
- An estimate for repair with high-quality spare parts.
- As an alternative, we can propose purchasing the same refurbished engine from our warehouse, which often significantly shortens the completion time. -
#5.How long does it take to repair a combustion engine?
- The verification of your engine will take us 1-3 days from the moment of delivery.
- You will receive an estimate for typical repairs within the next business day after the verification is completed.
- The repair itself usually takes about 3-5 weeks. -
#6.How do we test combustion engines?
Every refurbished engine undergoes rigorous testing on our engine dynamometer. The unit is loaded in a way that simulates operation in a construction machine. During the tests, we check key parameters such as:
- Power and torque performance.
- Coolant and oil temperature.
- Oil pressure depending on its temperature.
- Behavior and performance changes in relation to load.
The entire test lasts on average from 12 to 24 hours, depending on the specifics of the engine. -
#7.How can I be sure that the engine will work after the repair?
We care about the highest quality:
- We perform repairs exclusively on high-quality parts, and assembly work is always in accordance with the specification of a given engine.
- After the repair, the engine is thoroughly tested. The test result is always available in the form of a readable chart.
- You will receive a 12-month warranty for each repair. In case of questions regarding assembly or operation, we encourage you to use the expert knowledge of our sales advisors through a phone call. -
#8.Can I cancel the repair after receiving the estimate?
Yes, you can cancel the repair without any costs after receiving the estimate and before accepting it.
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#9.How much does it cost to repair my engine?
The cost of repair depends on several factors: the engine model, the degree of its wear and tear, and the scale of damage. Very often we can only provide an approximate price range, based on our history of similar repairs.
Do you have a problem with the Cummins 4BT3.9 engine?
We will arrange pickup, perform diagnostics, and prepare an estimate within 24h. Call or fill out the form - a WIBAKO advisor will call you back and present available service dates and parts for 4BT3.9.
