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336 Excavator

  • Specs Summary

3512C (HD) Offshore Well Stimulation Engine

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.

Standard Equipment

Air Inlet System

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

Exhaust System

  • Flexible exhaust fitting
  • Land well service engine
  • Exhaust manifold, dry, slip joint with stainless steel wire seal
  • Elbows, flange, exhaust adapters
  • Four turbochargers with watercooled bearings (center mounted)
  • Manifold and mufflers
  • 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


  • Remote panel display and remote cylinder temperature display
  • Gauges and instrument panels
  • No standard instrumentation
  • Optional, remote instrumentation available
  • Service meter

Mounting System

  • Trunion front support

Protection System

  • Sensors
  • Shutoff controls
  • 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

Optional Equipment

Charging System

  • Charging alternators

Control System

  • Local speed throttle control
  • Throttle position sensors
  • Cat® ADEM A3 ECU — LH
  • Governor conversion
  • With electronic fuel injector fuel system (10 amp DC power required to drive electronic engine control module)

Cooling System

  • Coolant regulator conversion
  • Separate Circuit SCAC system
  • Water level switch gauge
  • Torque converter connections
  • Coolant level sensors and coolant conditioner
  • Thermostats and housing, jacket and separate circuit water pump, gear-driven centrifugal

Fuel Systems

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

Lube System

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

Power Take-Offs

  • Front crankshaft adapter
  • Flywheel stub shaft
  • Accessory drive — lower LH
  • Front housing — two-sided

Starting System

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