NG/SK:

The “New Generation” (NG) series, introduced by Mercedes-Benz in 1973, marked a significant evolution in truck design, featuring an entirely new appearance and functionality.

NG (73) – Initial Launch

The first models launched in 1973 were construction site vehicles, followed in 1974 by versions featuring a 600mm longer sleeper cabin. By 1977, three cab variants were available:

=> Short Cab (S-Fahrerhaus)

=> Medium Cab (M-Fahrerhaus) – Identified by narrow rear side windows.

=> L-Fahrerhaus (Fernverkehrskabine) – A larger sleeper cabin with two cots, ideal for long-haul travel.

Additionally, custom-sized crew cabs (Doppelkabine/Doka) were produced for fire and government services.

NG (80) – Upgrades in 1980

The 1980 update brought a range of new engines with outputs from 95kW (130hp) to 276kW (375hp). Key identifying features included:

=> Wind deflectors added to the lower front corners of the cab.

=> The removal of the horizontal chrome bar on the grill.

NG (85) – Final Iteration in 1985

The 1985 refresh introduced several modern enhancements, including:

=> Electronic Power Shift (EPS): A computer-aided shifting system, standard on the flagship 1644 model. EPS was optional for smaller engines but unavailable for site vehicles.

=> Engine Expansion: Introduction of the OM 442LA V8 engine (14.6L), offering 320kW (435hp) with a turbocharger and intercooler. A non-intercooler version, OM442A, produced 257kW (350hp).

=> Exterior Updates: Smaller, square model badges with silver lettering.

=> Interior Updates: The dashboard was modernized with rocker switches replacing older push buttons.

Legacy

The NG 85, with its combination of rugged construction, advanced technology, and powerful engines, is highly favored as a base for expedition trucks. This model, often referred to simply as “NG,” continues to be a popular choice for overlanders and adventurers due to its durability, adaptability, and excellent performance in challenging terrains.

 

The Mercedes-Benz Schwere Klasse (SK) series, produced between 1989 and 1998, was the successor to the New Generation (NG) series and served as the precursor to the modern Actros. Though essentially a revamped NG chassis, the SK series introduced several enhancements to improve driver comfort, electronic systems, and overall performance, making it a more refined vehicle compared to its predecessor.

Key Features of the Mercedes-Benz SK Series

Evolution from the NG Series:

The SK retained the robust NG chassis but incorporated modern driver conveniences and diagnostic features, offering a smoother and more comfortable ride.

Engine Options:

=> The majority of NG and SK trucks were powered by V6 or V8 engines, with some exceptions like the military inline-6 OM352A (170hp) and the NG flagship V10 engine (375hp).

Popular engines included:

=> OM421 (V6, 216hp) and OM422 (V8, 280hp) for NG trucks.

=> OM442A (V8, 380hp) and OM442LA (V8, 440-530hp) for SK trucks.

=> OM441A/LA (V6, 270-340hp).

The engines were renowned for their durability, often achieving 1,000,000 miles (1,600,000 km) with proper maintenance.

1994 Facelift (SK2):

=> Introduced a modernized front design and engine upgrades.

=> The SK2 with the OM442LA engine (530hp) is particularly sought after, commanding a premium in the NG/SK series market due to its power and reliability.

Off-Road Capabilities for Expedition Builds:

=> For expedition truck conversions, the 4-wheel drive versions (AK=All-Wheel Drive Commercial, AF=All-Wheel Drive Fire Service) are highly desirable. These models include:

=> Differential locks for better traction.

=> Hi/lo gearing for varied terrain adaptability.

Transmission options include:

=> Regular manual transmissions.

=> Double-H shift transmissions (ZF) for improved handling.

=> Automatic transmissions (Allison and ZF) for ease of use.