When a heavy-duty engine starts making metal, burning oil, or losing compression, a parts-cannon repair is the expensive way to buy time. KG Truck Services has rebuilt 890+ diesel engines in Mississauga since 2005 — in-frame overhauls, complete out-of-frame rebuilds, and crate-quality assemblies for owner-operators and fleets that cannot afford a second failure. This page is the full story of that work: what we rebuild, how we do it, what the warranty covers, and why drivers keep sending the next truck here.
Truck engine rebuilds for every major make
We rebuild Caterpillar, Cummins, Detroit Diesel, PACCAR, Volvo, and Mack engines in Freightliner, Peterbilt, Kenworth, International, Western Star, and Volvo chassis. That includes common platforms you will actually see on Highway 401: Cummins ISX and X15, Detroit DD13 and DD15, CAT C13 and C15, PACCAR MX, Volvo D13, and Mack MP8. If the engine is in a Class 7 or Class 8 truck and it needs a real overhaul, it belongs in our bay — not at a dealer waiting on a crate with a dealer-only price.
An in-frame rebuild is the right call when the block, crank, and camshaft are still in spec and the chassis can stay together. We drop the pan, pull the oil pump, hang the pistons, replace liners, rings, bearings, and gaskets, and machine what the inspection says must be machined. An out-of-frame rebuild is the right call when we find cracks, a spun bearing, cam or crank damage, or wear that cannot be corrected with the engine in the truck. We pull it, tear it down to the bare block, inspect every journal and deck, and build it back to a standard you can warranty.
What a KG rebuild actually includes
Every job starts with a documented teardown, not a guess. We measure bores, journals, decks, and oil clearances. We look at the oil filter and pan for bearing material. We check the head for cracks and the valves for recession. Only then do we write the parts list. Typical complete rebuilds include pistons and rings, liners where required, main and rod bearings, gaskets and seals, oil pump work, cooling system attention, and a calibrated fuel system check. We do not reuse a bearing that “looks fine.” If it is a wear item on a rebuild, it gets replaced.
After assembly we fill with the correct oil and coolant, prime the lubrication system, and run a controlled break-in. Electronic engines get a diagnostic sweep so we are not handing you a mechanically perfect motor with a lurking aftertreatment or sensor fault. If the truck needs ECM work, injector coding, or a DPF regen strategy after the rebuild, that is part of getting it back under load — not a surprise on the first trip to Montreal.
Why fleets book rebuilds in Mississauga
Our shop sits at 6771 Columbus Road, minutes from the 401, 407, and Pearson. That matters when a tractor is already off the road and every extra kilometre of towing is lost revenue. You get a single facility that can diagnose, rebuild, and road-test without farming the engine out to three vendors. Twenty-plus years of this work means we have seen the failure patterns: EGR cooler contamination that takes a head with it, coolant in the oil, spun mains after a starved oil pump, and “just replace the turbo” jobs that hide a worn bottom end.
You will get a written estimate after teardown, a written warranty at delivery, and a parts list you can keep with the truck file. Standard coverage is 12 months or 160,000 km on parts and labour for the work we performed, with extended options for fleets that cycle engines harder. Call (905) 564-0880 to schedule a teardown. If the engine can be saved in-frame, we will tell you. If it needs to come out, we will tell you that too — before we spend your money.
