Diesel injectors
Diesel Generator Injector Service
We test and service diesel generator injectors when hard starting, rough running, smoke or power loss points to the fuel spray. Injectors meter and spray diesel into each cylinder, and a poor spray shows up in all of those symptoms. The air supply, fuel quality and the fuel pump can cause the same signs, so we test before we quote for injectors.
Callout fee waived when you accept our written quote. 1-year workmanship guarantee. See prices
- Diesel engines only
- Injectors tested before we quote them
- Clean, repair or replace: the test decides
- Onsite across Gauteng
How the diesel is burnt
What do diesel generator injectors do?
Injectors deliver a measured spray of diesel at exactly the right moment so the engine can burn it. A poor spray pattern, a blockage, a leak or a cylinder that is not pulling its weight shows up as hard starting, uneven running, smoke or a set that will not hold load.
The air supply, fuel quality, a pump that is not delivering and simple overload can cause the same symptoms. We test the injectors when the symptoms point to combustion, not because someone saw black smoke once.
Cleaning, repair and replacement are different outcomes. Some injectors can be serviced, others must be replaced, and we tell you which after testing. The work is done on site, at your premises. As a guide, diesel injector replacement costs R3,000 to R9,000, and your written quote sets the actual price before we start.
What poor spray looks like
Signs of injector problems
Diesel generator hard starting
A slow fire, or a start that needs several attempts, can come from poor injection. It can also be air, glow plugs, cold or fuel that is not arriving, and we rule those out before we pull injectors.
Black smoke and injector faults
Black smoke can mean too much fuel for the air available. An injector is one possible cause, so we check the air filter and the load in the same visit. Our black smoke guide covers the symptom.
Rough running and misfiring
One cylinder that burns unevenly makes a diesel sound wrong and can show as smoke or a shake. We find that cylinder rather than replacing a full set of injectors.
Injector testing
We assess each injector’s contribution, check for leaks and, where the equipment and the injector allow it, test the spray. Opening high-pressure fuel lines is a job for us, never a customer step.
Injector cleaning versus repair versus replacement
A restricted injector may clean up, while a leaking or damaged one may not. We recommend replacement when the test shows the part cannot go back into service, and we work on site only when the injector and the site allow it.
Fuel quality and injector problems
Water, dirt and old diesel damage spray tips and seats. We check the filters and the tank as part of every injector visit.
Common Questions
Questions about diesel generator injectors
What do diesel generator injectors do?
They spray a measured amount of diesel into each cylinder at the right moment, so the engine burns it evenly.
Does black smoke mean the injectors are faulty?
Not by itself. Excess fuel, a blocked air filter, overload and poor combustion all cause black smoke. Injectors are one possibility, and we test them alongside the others.
Can you service injectors on site?
Yes. We test, service and replace injectors at your premises. The test decides whether an injector can be serviced or has to be replaced.
Will you calibrate the injection pump as part of this?
No. This service covers injector condition. Injection pump calibration is specialist work and is not part of a routine injector visit.
The engine is hard to start. Is that the injectors?
It might be. We also test for air in the fuel, a weak fuel supply and cold combustion.
Can dirty diesel cause injector trouble?
Yes. Water and dirt are a common reason the spray deteriorates, so we check the fuel and the filters along with the injectors.
How is this different from a fuel pump repair?
The pump supplies the diesel and the injectors spray it. A pump that delivers nothing and an injector with a poor spray are different faults with different repairs.
Still unsure what the fault is? Call or WhatsApp 082 057 4605 for onsite diagnosis.
Service Areas
Onsite visits across Gauteng
We come to your generator anywhere in Gauteng, 24/7. Choose your region for local suburbs, call-out details and the faults we see most there.
What to send before we attend
These details help us plan the visit and bring the right parts. Send what you can on WhatsApp; if you can’t find the model number, we still book the visit.
- Location
- The suburb or site, so the visit can be booked in the right area.
- Make and model
- The generator brand and model, if they are known.
- kVA
- The size printed on the data plate.
- Fuel type
- Diesel, petrol, LPG, natural gas, or dual-fuel.
- Controller model
- The module name on the panel, when it is visible.
- Fault or alarm
- What the set does, and any text on the screen.
- Photos
- The generator, the data plate, and the controller or alarm. Send these on WhatsApp.
Book a Visit
Describe the smoke and the running
Hard start, rough idle, black smoke or power that falls away under load: tell us which, along with the make and kVA of the set.
- Call
- 082 057 4605
- Message us on WhatsApp
What happens next
- We reply with questions about the generator, or to book a visit.
- A technician comes to you. For a breakdown we arrive within 1 hour.
- The fault is diagnosed on site and you get a written quote. No work starts until you accept it.
Charlie, lead technician: Degree in Mechanical Engineering, Degree in Electrical Engineering, Diesel Plant Fitter. Generator specialists since 2000.