The engine is the heart of your commercial truck. When it needs repair — whether it's a targeted fix on a specific system or a full engine overhaul — you need a shop that knows diesel engines from the inside out. Interstate Fleet Services has been repairing commercial diesel engines in Rock Hill, SC for 26 years. We work on all major engine platforms: Cummins, Detroit Diesel, PACCAR, Volvo, Mack, and Caterpillar. No job too big — A to Z coverage includes full engine overhauls.
We start with accurate diagnosis. A diesel engine repair that addresses the symptom instead of the root cause is money wasted. Our diagnostic process identifies what failed, why it failed, and what needs to be done to prevent the same failure from recurring.
Call Now: (803) 329-9755Complete cylinder rebuild with pistons, rings, liners, bearings, gaskets, and seals replaced with the engine in chassis. Most efficient approach for standard overhauls on healthy blocks.
Engine removal for comprehensive rebuild allowing full block inspection, crack testing, and component evaluation. Recommended when engine has significant wear or damage history.
Common-rail injection system service: injector testing, replacement, high-pressure pump service, fuel rail inspection. Contaminated fuel system flush and component replacement.
Turbo diagnosis, oil system root-cause analysis, and turbo replacement. We identify why the turbo failed and address the underlying cause so the replacement lasts.
Thermostat, water pump, cooling hoses, radiator, and head gasket service. Overheating is a fast path to catastrophic engine damage — we fix cooling systems right.
EGR valve, EGR cooler, DPF, DOC, and SCR system repair. Emissions components require proper service to maintain fuel economy and avoid derating faults.
Valve lash adjustment, rocker arm inspection, cam follower service, and valve cover gaskets. Valve train issues are common on high-mileage engines.
We source quality in-frame and out-of-frame rebuild kits from reputable suppliers for all major engine platforms. We discuss OE, remanufactured, and aftermarket options.
We work on Cummins (ISX, X15, ISB, ISC), Detroit Diesel (DD13, DD15, DD16, Series 60), PACCAR MX-11 and MX-13, Volvo D11/D13, Mack MP8/MP10, Navistar MaxxForce, and Caterpillar C-series truck engines. Both older mechanical engines and fully electronic modern platforms.
An in-frame overhaul rebuilds the engine with the block remaining in the truck — pistons, rings, liner, bearings, and gaskets are replaced with the engine in place. An out-of-frame overhaul removes the engine for a more comprehensive rebuild. We assess and recommend based on the engine's condition and the scope of failure.
Key indicators for overhaul consideration: excessive oil consumption, blow-by at the crankcase breather, low compression on cylinder contribution tests, worn bearings indicated by oil analysis, or a high-mileage engine with declining performance. Targeted repairs address specific failures without full overhaul. We diagnose and give an honest recommendation.
Yes. We work on older mechanical injection engines — Cummins NTC/N14, Detroit Series 60, CAT 3406E — as well as modern electronic engines. Older mechanical engines often have more straightforward repairs when problems are identified.
An in-frame overhaul typically takes 3–7 days depending on parts availability and the scope of work. Out-of-frame overhauls can take 1–2 weeks. We give you a realistic timeline before starting and communicate if anything changes.
26 years of diesel engine expertise. All major platforms. Rock Hill, SC.
(803) 329-9755