Cummins QSL8.9 - engine service and repair
Comprehensive diagnostics, overhauls, and bench tests. Door-to-door pickup throughout Poland. Warranty up to 12 months. Parts and components for HPCR systems, turbochargers, and aftertreatment.
- Original parts
- Dynamometer test report after repair
- Short lead times
- Technical support and replacement selection
Contact form
Typical symptoms of internal combustion engine damage
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 wear of engine components.
Unusual noises
Knocking, rattling, or metallic sounds may indicate wear of bearings, pistons, or valves.
Vibrations and overheating
The engine runs unevenly, shakes, and operating temperature rises quickly - these are signals of damage to the cooling system or mechanical components of the unit.
Cummins QSL8.9 service at WIBAKO
QSL8.9 (also known as ISL9/QSL9) is a 6-cylinder, inline engine with a displacement of 8.9 l, widely used in construction, municipal, and agricultural machinery. The QSL platform utilizes the Bosch HPCR injection system and Holset HX40 turbochargers, providing a very good power-to-weight ratio and high operational culture. :contentReference[oaicite:2]{index=2}
In newer versions meeting Tier 4 Final/Stage IV emission standards, the engine uses an EGR system, CCC catalyst, and SCR, combining low fuel consumption with reduced emissions. :contentReference[oaicite:3]{index=3}
Where Cummins QSL8.9 is used
This engine is installed in many types of machines: excavators, cranes, wheel loaders, rollers, air compressors, container handling trucks, as well as in tractors and sprayers. :contentReference[oaicite:4]{index=4}
Wheel loaders
Hyundai HL770-9, HITACHI ZW310-6, JCB 457, and other high-capacity models. :contentReference[oaicite:5]{index=5}
Dump trucks and transport
Terex TA27 and other articulated dump trucks with QSL8.9 engines. :contentReference[oaicite:6]{index=6}
Power generators
QSL9 G-Drive units (e.g., G7, G2) and CPAK packages for industrial applications. :contentReference[oaicite:7]{index=7}
Common faults and symptoms
- Power loss, smoking, high fuel consumption - clogged HPCR injectors, leaks on the common rail, or worn Holset turbocharger. :contentReference[oaicite:8]{index=8}
- Overheating and fluid loss - leaks in the EGR cooler, damaged water pump, or oil cooler. :contentReference[oaicite:9]{index=9}
- Electronic errors and limp mode - issues with pressure/temperature sensors, ECM controller, or aftertreatment module. :contentReference[oaicite:10]{index=10}
WIBAKO service range
Diagnostics and testing
Computer diagnostics of ECM, compression measurement, bench tests, control of the HPCR system and turbocharger.
Repairs and regeneration
Grinding and honing of blocks, head regeneration, replacement of sleeves, pistons, bearings, oil pump, water pump, seals, and crankshaft.
Fuel system and emissions
Bosch injectors, high-pressure rail and pump, EGR, DPF/SCR, valves and sensors, restoring emission parameters.
Numbers and designations found in QSL8.9
QSL8.9/QSL9/ISL9, G-Drive QSL9 G7/G2 variants for generator sets, CPAK kits for pumping and industrial applications. :contentReference[oaicite:11]{index=11}
Why WIBAKO
- Parts warehouse for Cummins QSL8.9 and quick availability of Holset turbochargers, Bosch injectors, and cooling system components.
- Door-to-door - pickup of the engine or entire machine within Poland and the EU.
- Final tests and warranty up to 12 months on the services performed.
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.
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.
Customer reviews
Regeneration of the turbocharger and injectors QSL8.9 was done quickly and professionally. - Krzysztof
Good door-to-door logistics, clear pricing, warranty after tests. - Paweł
EGR issue resolved and fuel system calibrated. The machine returned to the construction site after 72 hours. - Marek
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.
Repair of Cummins QSL8.9 engine - send an inquiry
Describe the symptoms, provide the engine serial number and machine model (e.g., Hyundai HL770-9, HITACHI ZW310-6, Terex TA27, JCB 457). We will prepare a preliminary estimate and door-to-door pickup date.
