Caterpillar 3512B Rebuild Long Block

Diesel Power Holland delivers fully rebuilt Caterpillar 3512B long blocks, assembled in our own workshop in Moerdijk, Netherlands, to meet original Caterpillar factory specifications. The 3512B is one of the most powerful and widely deployed engines in the Caterpillar 3500 series — a V12 diesel trusted globally for marine propulsion, large-scale power generation, oil & gas operations, and heavy industrial applications. When your 3512B needs a complete engine core rebuild, Diesel Power Holland provides the expertise, parts depth, and speed to get you back online.

What Is a Caterpillar 3512B Long Block?

A Caterpillar 3512B long block is the fully assembled engine core — comprising the cylinder block, crankshaft, cylinder heads, pistons, camshafts, bearings, valve train, oil pump, and all internal drivetrain components — delivered without external accessories such as exhaust manifolds, wiring harnesses, or cooling system connections. This makes the long block the optimal solution when the external components of your existing engine are still serviceable, significantly reducing total rebuild cost and turnaround time compared to replacing a complete engine assembly.

The CAT 3512B is a 12-cylinder, 51.8-litre V-configuration diesel engine producing between approximately 895 and 1230 kW (1,200–1,650 HP) depending on application and rating. It is engineered for continuous heavy-duty operation and is a mainstay in sectors where reliability and power density are critical.

Caterpillar 3512B full component scope

Every rebuilt 3512B long block that leaves our facility is assembled using a combination of new, overhauled, and reconditioned components, all verified against Caterpillar OEM specifications:

• Cylinder Block Group: Thoroughly inspected and machined to ensure structural integrity
• Crankshaft: Precision-checked for balance and surface finish
• Cylinder Packs: Precision-machined for efficient combustion and maximum output
• Piston Cooling Jets: Inspected and refitted to protect piston temperatures under load
• Camshafts: Rebuilt to ensure accurate valve timing and engine performance
• Cylinder Heads: Restored to original flow and sealing specifications
• Main, Conrod & Camshaft Bearings: All replaced with high-quality components
• Powertrain Distribution (Rear) & Front Gears: Overhauled for smooth power transfer
• Front & Flywheel Housings: Inspected and restored
• Oil Pump: Rebuilt to maintain correct lubrication pressure throughout the engine
• Injectors & Valve Train: Calibrated for precise fuel delivery and combustion efficiency
• Oil & Fuel Filter Housings: Replaced or refurbished to prevent contamination
• Finished in CAT Yellow: Each long block is painted in the iconic Caterpillar yellow, providing corrosion protection and a professional finish

The complete rebuild is carried out in accordance with official Caterpillar rebuild procedures, ensuring every unit is ready for installation and reliable long-term operation.

Applications of the Caterpillar 3512B Engine

The Caterpillar 3512B is deployed across some of the most demanding environments in the world. Common applications for this engine — and therefore for a 3512B long block rebuild — include:

• Marine propulsion: main drive engines in offshore supply vessels, platform supply vessels (PSVs), tugboats, and dredgers
• Marine auxiliary power: vessel generator sets requiring continuous high-output power
• Electric power generation: prime power and standby generator sets for industrial plants, data centres, and utilities
• Oil & gas: drilling rigs, pump drives, and wellsite power units both onshore and offshore
• Mining & heavy industrial: large-scale machinery and process equipment requiring sustained high horsepower

In all of these sectors, a professionally rebuilt 3512B long block delivers performance equivalent to a factory engine at a fraction of the lead time and cost of a new unit.

Why source your Caterpillar 3512B Long Block from Diesel Power Holland?

With roots going back to 1976, Diesel Power Holland has built its reputation on one principle: keeping heavy equipment running, wherever in the world it operates. When you choose us for your Caterpillar 3512B rebuild, you receive:

• Specialist 3500-series expertise: our engineers have rebuilt numerous 3512B, 3512C, 3516B, and 3516C engines across all major application types
• Over 1,000,000 parts in stock: enabling fast sourcing and short rebuild lead times, even for high-demand 3512B components
• Full rebuild documentation: every long block is delivered with a complete parts specification detailing what is new, overhauled, or inspected
• Worldwide shipping from the Netherlands: we handle all required export documentation for seamless international delivery
• Available for immediate delivery: rebuilt stock is often available off the shelf, minimising equipment downtime for your operation
• Post-delivery technical support: our team remains available after delivery for any installation or operational questions

Need a Caterpillar 3512B Long Block or spare parts?

Whether you require a complete rebuilt Caterpillar 3512B long block, individual 3512B spare parts — including crankshafts, cylinder heads, camshafts, or injectors — or expert advice on whether a long block rebuild is the right solution for your engine, Diesel Power Holland is your dedicated partner. We serve fleet operators, engine repair workshops, and equipment owners in over 100 countries.

Reach our team directly at info@dieselpowerholland.com or call +31 (0)168 388 488.