DIESEL ENGINE OVERHAUL · GAUTENG
When your heavy plant or fleet vehicle loses power, burns oil, or comes to a dead stop on site, every hour of downtime costs your operation money. CMKT Engineering and Projects delivers professional diesel engine overhaul services across Gauteng — from initial strip-down right through to dynamometer testing and final sign-off.
UNDERSTANDING THE SERVICE
A diesel engine overhaul is a comprehensive mechanical restoration of an engine — far more thorough than a routine service and far more targeted than simply replacing the whole unit. During an overhaul, the engine is fully stripped, every component is inspected and measured against manufacturer tolerances, worn or damaged parts are reconditioned or replaced, and the engine is reassembled with precision to restore original or near-original performance specifications.
For heavy plant and fleet operators, a proper overhaul can extend engine life by tens of thousands of operating hours and restore fuel efficiency, power output, and reliability to acceptable levels. It is almost always more cost-effective than sourcing a replacement engine on the open market, particularly given current rand exchange rates and the scarcity of quality used units for specialised machinery.
Strip to bare block, machine all surfaces, replace all bearings, rings, gaskets, seals, and liners. Correct for high-hour engines with widespread wear, cracked heads, or damaged bores.
Addresses cylinder head, valves, and upper components only. Suits engines where wear is confirmed to the top end but crankshaft, bearings, and bores are within tolerance.
Our technicians assess each engine individually to recommend the most cost-effective scope of work. We will never oversell an overhaul when a partial repair is sufficient.
OUR OVERHAUL PROCESS
Every diesel engine overhaul at CMKT Engineering and Projects follows a structured, documented process from first contact to final sign-off. No steps are skipped. No corners are cut.
We assess the engine condition, review service history, and carry out diagnostic checks to confirm the scope of work before any strip-down begins. You receive a written assessment and cost estimate before we proceed.
The engine is stripped to the bare block. All components are cleaned and laid out for individual inspection. Nothing is assumed to be serviceable until we have measured and verified it against manufacturer specifications.
Every bore, journal, and surface is measured with calibrated instruments. Cylinder bores, crankshaft journals, camshaft lobes, and valve stem clearances are all measured and recorded. This determines the exact machining and parts requirements.
Cylinder bores are honed or sleeved, crankshafts are ground and polished, cylinder heads are resurfaced, and valve seats are reconditioned. All machine work is performed to the tolerances specified by the original engine manufacturer.
New bearings, rings, gaskets, seals, and liners are fitted as required. The engine is assembled following correct torque sequences and clearances. Every fastener is tightened to specification. No guesswork.
Every overhauled engine runs on our dynamometer before it leaves. Power output, torque, oil pressure, coolant temperature, and emission compliance are all verified under load. You receive a signed test report with the engine.
QUALITY ASSURANCE
After every diesel engine overhaul we carry out full Dynamometer Testing to verify power output, torque, oil pressure, operating temperature, and emission compliance. You get an engine back that has been proven to perform under load conditions — not just rebuilt and hoped for the best.
Dyno Testing is standard on every rebuild at CMKT Engineering and Projects. You receive a signed test certificate confirming performance before the engine goes back into your machine.
WHY CHOOSE CMKT
Our team holds the relevant qualifications and hands-on experience to handle complex diesel engine rebuilds across a range of makes and applications. You will always know who the responsible engineer is on your job.
We use calibrated measuring equipment and in-house machining capabilities to deliver overhauls that meet exact manufacturer tolerances. No guesswork. No outsourcing critical machine work to unverified suppliers.
We strip the engine, measure every component, and give you a written assessment of what needs to be done and what it will cost before the rebuild begins. No surprise invoices at the end of the job.
Every rebuilt engine is tested on our dynamometer and signed off before it leaves our workshop. The test certificate travels with the engine. You put a proven unit back into service, not a rebuilt one.
WHAT CLIENTS SAY
We do not believe in empty promises. Here is what clients across Gauteng and South Africa say about our diesel engine overhaul and rebuild work.
CMKT Engineering and Projects overhauled two of our mine spec diesel engines. The turnaround was fast and both units are running stronger than expected. That kind of workmanship is hard to find.
The dynamometer testing after our engine rebuild gave us full confidence before we put the truck back into service. That level of accountability is exactly what we needed.
We have been using CMKT for fleet engine servicing for over two years. Their workmanship is consistent, their communication is clear, and our vehicle downtime has dropped significantly.
Our earthmover engine was completely shot after a site breakdown. CMKT stripped it, assessed it, and had it rebuilt and dyno tested within two weeks. Back on site and running like new.
We are based in Gauteng and travel to client workshops and field sites across South Africa. If your engine needs overhauling, or your machinery is down in the field, we will get to you.
Based outside these areas? WhatsApp us on +27 74 578 3032 and we will find a plan that works for you.
COMMON QUESTIONS
A diesel engine service covers routine maintenance items such as oil, filters, belts, and coolant. A diesel engine overhaul is a full mechanical restoration — the engine is stripped, every component is measured and inspected, worn parts are machined or replaced, and the engine is reassembled to manufacturer tolerances. An overhaul is appropriate when there is internal wear or damage that a service cannot address.
Turnaround depends on the engine type, the scope of work required, and parts availability. A typical overhaul on a standard heavy plant or fleet diesel engine takes between one and three weeks. We give you a realistic timeline after the initial strip-down and inspection, before rebuild work begins. We do not give deadlines we cannot meet.
In most cases, yes. A quality overhaul typically costs significantly less than sourcing a replacement engine, particularly for specialised plant machinery where used units are scarce and new units carry rand-denominated import costs. A properly rebuilt engine also comes with a known history, defined tolerances, and a dyno test certificate — something a second-hand engine cannot offer.
We overhaul diesel engines across a broad range of makes and applications including Caterpillar, Cummins, Perkins, Detroit Diesel, John Deere, Isuzu, Mercedes-Benz OM series, Toyota, Volvo, MAN, and others. If you are unsure whether we can handle your engine make, call or WhatsApp us and we will tell you directly.
Yes. We stand behind our work. Warranty terms are discussed and agreed at the time of quoting and are documented on the job card. Every engine leaves our workshop with a signed dyno test certificate. If there is a problem with our workmanship after handover, we address it. Call us on 074 578 3032 to discuss.
Both options are available. Many clients bring the engine to our Gauteng workshop directly. Where the machinery cannot be moved, we can mobilise a team to carry out on-site strip-down and remove the engine for workshop overhaul. Discuss your situation with us on 074 578 3032 and we will work out the most practical approach.
Every hour your engine is out of action costs your operation money. Whether you need a diesel engine overhaul in Pretoria, a full engine rebuild in Johannesburg, or an assessment of a fleet vehicle anywhere in Gauteng — CMKT Engineering and Projects is ready. We are registered, qualified, and we deliver rebuilt engines with dyno test certificates to prove it.
CONTACT US
Use the form below for a free quote, or for a faster response WhatsApp us or call directly.
