3512C HD (Offshore)

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The 3512C (HD) offshore engine for well stimulation operations was specifically developed to operate in harsh environments offshore while meeting the highest standards in performance, durability, reliability, and emissions. Cat engines are backed by the worldwide network of Cat dealers ready to support your operation with technical support, service, parts, and warranty. 3512C (HD) offshore engines, with ratings: 1678-1864 bkW (2250-2500 bhp) @ 1900 rpm meet IMO Tier II and U.S. EPA Marine Tier 2 emission standards.

General Specifications

Minimum Rating 2250.0 bhp 1678.0 bkW Less
Maximum Rating 2500.0 bhp 1864.0 bkW Less
Aspiration Turbocharged-Aftercooled Turbocharged-Aftercooled Less
Displacement 58.9 in3 3596.0 L Less
Flywheel and Flywheel Housing SAE No. 0 SAE No. 0 Less
Flywheel Teeth 151 151 Less
Stroke 8.5 in. 215.0 mm Less
Bore 6.7 in 170.0 mm Less


Emissions IMO Tier II and EPA Marine Tier 2 IMO Tier II and EPA Marine Tier 2 Less


Length 113.8 in. 2880.0 mm Less
Width 64.2 in. 1630.0 mm Less
Height 86.1 in. 2185.0 mm Less
Weight 14145.0 lb 6416.0 kg Less

Making Your Investment Work Harder

- Separate Circuit Aftercooler (SCAC) • Flexible cooling options • Compatible with industry-standard radiator - Industry-leading power and torque capabilities optimized for fracturing applications - Simplified controls and customer connection points decrease time to get up and running - Optimized ambient and altitude capabilities for operating flexibility - Corrosion-resistant stainless steel lines, bellows, and highnickel-content exhaust manifolds - All external aluminum alloy parts have a baked phenolic coating for corrosion protection - SOLAS spray shielding on fuel and oil lines TH55 petroleum transmission: • Optimized for petroleum pumping applications • Evenly spaced gear ratios provide smooth shifting for pumping • Provides a much broader range of pumping speeds than the competition • Deep first-gear ratio ideal for application flexibility, allows pumping at lower flow rates and pressure

Engine Design

- Proven reliability and durability - Robust diesel strength design prolongs life and lowers owning and operating costs - Broad operating speed range - Air shutoff — integrated with engine controls

Cooling System

Separate Circuit Aftercooler (SCAC)

Engine-Mounted Transmission Oil Cooler —

Integration with engine cooling system allows ease of installation and a tighter overall engine package

Advanced Digital Engine Management

ADEM A3 engine management system integrates speed control, air/fuel ratio control and ignition/detonation controls into a complete engine management system with integrated digital ignition, engine protection and monitoring

Custom Packaging

For any petroleum application, trust Caterpillar to meet your project needs with custom factory generator sets and mechanical packages. Cat engines, generators, controls, radiators, and transmissions can be custom designed and matched in collaboration with our local dealers to create unique solutions. Custom packages are globally supported and are covered by a one year warranty after startup.

Full Range of Attachments

Large variety of factory-installed engine attachments reduces packaging time


Every engine is full-load tested to ensure proper engine performance

Product Support Offered Through Global Cat Dealer

- More than 2,200 dealer outlets - Cat factory-trained dealer technicians service every aspect of your petroleum engine - Cat parts and labor warranty - Preventive maintenance agreements available for repairbefore-failure options - S•O•SSM program matches your oil and coolant samples against Caterpillar set standards to determine: • Internal engine component condition • Presence of unwanted fluids • Presence of combustion by-products • Site-specific oil change interval

Over 80 Years of Engine Manufacturing Experience

- Ownership of these manufacturing processes enables Caterpillar to produce high quality, dependable products. • Cast engine blocks, heads, cylinder liners, front and flywheel housings • Machine critical components • Assemble complete engine

Web Site

For all your petroleum power requirements, visit www.catoilandgasinfo.com.

3512C HD (Offshore)Standard Equipment

Air Inlet System
  • Heavy-duty air cleaners (dual element/service indicator)
  • Four center-mounted turbochargers

Control System
  • Cat® ADEM A3 ECU — LH
  • With electronic fuel injector fuel system (10 amp DC power required to drive electronic engine control module)

Cooling System
  • Separate Circuit SCAC system
  • Torque converter connections
  • Thermostats and housing, jacket and separate circuit water pump, gear-driven centrifugal

Exhaust System
  • Land well service engine
  • Exhaust manifold, dry, slip joint with stainless steel wire seal
  • Four turbochargers with watercooled bearings (center mounted)
  • Exhaust outlet, dual 203 mm (8 in) round flange

Flywheel and Flywheel Housings
  • Flywheel, SAE No. 0, 151 teeth
  • Flywheel housing, SAE No. 0

Fuel System
  • Primary fuel filter
  • Fuel priming pump
  • Fuel filter — RH spin-on type
  • Fuel transfer pump
  • Electronically controlled unit injectors

  • No standard instrumentation
  • Optional, remote instrumentation available
  • Service meter

Lube System
  • Crankcase breather — top mounted
  • Oil cooler
  • Oil filler and dipstick — LH
  • Oil pump
  • Oil filter — RH spin-on type
  • Rear sump oil pan — 250-hour change interval
  • Oil pan drain valve — 1" NPT female connection
  • Fumes disposal
  • Scavenger pump

Mounting System
  • Trunion front support

Power Take-Offs
  • Accessory drive — lower LH
  • Front housing — two-sided

Protection System
  • ADEM A3 ECU system to provide customer programmable engine deration strategies to protect against adverse operating conditions
  • Emergency stop logic inputs provided at 40-pin customer interface connection
  • Dual air inlet shutoff
  • Oil pressure monitor

  • General
  • Vibration damper and guard
  • Lifting eyes

3512C HD (Offshore)Optional Equipment

Charging System
  • Charging alternators

Control System
  • Local speed throttle control
  • Throttle position sensors
  • Governor conversion

Cooling System
  • Coolant regulator conversion
  • Water level switch gauge
  • Coolant level sensors and coolant conditioner

Exhaust System
  • Flexible exhaust fitting
  • Elbows, flange, exhaust adapters
  • Manifold and mufflers

Fuel Systems
  • Flexible fuel lines
  • Water/fuel separator
  • Fuel level switch

  • Remote panel display and remote cylinder temperature display
  • Gauges and instrument panels

Lube System
  • Oil pans and filters
  • Deep sump oil pan and front sump pan

Power Take-Offs
  • Front crankshaft adapter
  • Flywheel stub shaft

Protection System
  • Sensors
  • Shutoff controls

Starting System
  • Air starting motors
  • Electric starting motors
  • Hydraulic starter
  • Ether starting aids
  • Battery sets — 24V
  • Battery cable and battery rack