Parts for Caterpillar 3512B

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Engine Specifications & Applications of the Caterpillar 3512B Engine

Introduction

The Caterpillar 3512B engine is a mainstay in the world of heavy-duty diesel power. Known for its durability, high horsepower, and versatility, the 3512B is a V-12, 4-stroke-cycle engine designed to deliver uncompromising performance across a variety of sectors. Whether installed in marine vessels, power generation equipment, mining trucks, or industrial platforms, this engine is built for endurance and optimized for efficiency.

At Diesel Pro Power, we focus exclusively on supplying high-quality aftermarket parts for this model—offering an alternative to OEM components that are often more expensive or harder to find. The aftermarket for the 3512B engine is robust, and we support it with parts that meet or exceed the original specifications in reliability, longevity, and value.

This guide provides a detailed overview of the engine’s technical specifications and its common applications across multiple industries.

Engine Specifications

Base Engine Design

Engine Model : Caterpillar 3512B
Configuration : 4-stroke cycle, V-12 diesel engine
Displacement : 3,158 cubic inches (51.8 liters)
Bore x Stroke : 6.7 x 7.5 inches (170 mm x 190 mm)
Compression Ratio : 14.0:1
Aspiration : Turbocharged and aftercooled
Fuel System : Electronic Unit Injector (EUI)
Control System : ADEM™ III electronic management
Rotation : Counterclockwise (viewed from flywheel end)

Performance Metrics

Horsepower Range : 1,500 to 1,650 hp (1,119 to 1,231 kW)
Rated Speed : 1,800 RPM
Peak Torque : Over 5,000 lb-ft (6,700+ Nm)
Operational Temperature Range : -20°F to 130°F (-29°C to 54°C) with correct fluids and insulation
Fuel Consumption (approx.) : 0.36–0.38 lbs/hp/hr depending on application and load

Dimensions & Weight

Length : 120.8 inches (3,067 mm)
Width : 70.3 inches (1,785 mm)
Height : 71.1 inches (1,806 mm)
Dry Weight : 13,400 lbs (6,078 kg)

Lubrication & Cooling

Oil Capacity : Typically ranges from 18 to 22 gallons (68 to 83 liters) depending on sump configuration
Cooling System Capacity : Up to 25 gallons (95 liters)
Oil Pressure : 45–60 psi at rated speed
Recommended Coolant : Heavy-duty ethylene glycol-based mixture with supplemental coolant additives

Applications of the 3512B Engine

Marine Industry

Commercial Tugboats

The 3512B engine is a go-to solution for tugboats due to its exceptional low-end torque and responsive throttle. In harbor operations, the ability to provide sudden bursts of power is critical, and this engine delivers it without hesitation.

Offshore Supply Vessels

Many offshore vessels rely on the 3512B to power both propulsion and auxiliary systems. These ships often work under extreme conditions, and downtime is costly. The engine's robust design ensures maximum uptime.

Fishing Trawlers

For high-seas operations, especially in commercial fishing fleets, fuel economy and power stability are essential. The 3512B excels in these areas while providing straightforward maintenance access, an advantage during long expeditions.

Industrial & Mining

Haul Trucks & Loaders

The engine is widely used in mining haul trucks and large front-end loaders. The high torque at low RPM ensures effective movement of heavy payloads, while the engine’s ability to operate in dusty, rugged terrain adds to its appeal.

Drill Rigs & Cranes

Oil and gas drilling operations frequently use this engine in rotary drill rigs and hoisting cranes. The ADEM control system allows for precise fuel management and load handling, which translates to cost savings and reduced emissions even in non-regulated environments.

Power Generation

Standby and Prime Generators

One of the most common uses for the 3512B is in generator sets, both for standby and prime power. Its reliability during grid outages has made it a trusted engine for data centers, hospitals, water treatment plants, and airports.

Remote Industrial Power

Industries located far from the grid—such as mining or oil fields—depend on this engine to power their equipment and living quarters. The engine's long service intervals and high fuel efficiency reduce the total cost of ownership in these remote settings.