Mack



Is it time for an overhaul for your hard-working MACK® E7 engine? We're experts in your truck's engine technology; we know what's causing the symptoms you describe. Is your truck showing any of these symptoms? If so, an overhaul could be the solution.

Blue or Black Exhaust

One or more cylinders may be burning oil or fuel is running too rich or lean.

Likely caused by worn or damaged: Piston Rings, Injectors, Cylinder Liner, Valve Stems and Guides

Increased Oil Consumption

The engine may be leaking or burning oil; either situation isn't good.

Likely caused by worn or damaged: Piston Rings, Cylinder Liner, Valve Stems and Guides

White Exhaust

Coolant may be burning in one or more cylinders.

Likely caused by worn or damaged: Cylinder Liner, Head Gasket

Low Fuel Economy

Loss of cylinder compression or over-fueled cycles.

Likely caused by worn or damaged: Injectors, Valve Stems and Guides

Engine Knocking

Combustion timing may be off in one or more cylinders or oil contamination may have occurred.

Likely caused by worn or damaged: Liner Seals, Main Bearings, Piston Skirt, Valves

Low Oil Pressure

Oil may not be reaching all the components.

Likely caused by worn or damaged: Main Bearings/Rod Bearings

Reduced Acceleration/Hard Start

Possible loss of cylinder compression.

Likely caused by worn or damaged: Piston Rings, Valves, Cylinder Liner, Head Gasket

Poor Engine Brake Performance

Possible loss of cylinder compression.

Likely caused by worn or damaged: Piston Rings, Valves, Cylinder Liner

Continued driving under any of these conditions could lead to catastrophic engine failure. Trust us to investigate and report the facts so you can choose the solution that's right for you.

Ask your dealer about installed price packages for your Mack Purebred overhaul today.