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Caterpillar D398 Diesel Engine Operation & Maintenance Manual

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Caterpillar D398 Diesel Engine Operation & Maintenance Manual

Factory Workshop Reference • 100% Free ($0.00)

Caterpillar D398 V12 Heavy Marine & Industrial Diesel Engine

DISPLACEMENT
29.4L (1,786 cu in)

CYLINDER HEAD TORQUE
See Fastener Torque Matrix

COLD VALVE LASH
Inlet 0.015 in / Exhaust 0.035 in

OIL CAPACITY
70.0 US Gal (266 Liters)

• Unbundled Adobe PDF • No checkout or registration • Clean OEM Document

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The Caterpillar D398 is a legendary 60-degree V12 heavy-duty four-stroke diesel engine displacing 29.4 liters (1,786 cubic inches), widely deployed across commercial marine tugs, offshore drilling rigs, locomotive power, and continuous prime power generation stations. This official factory operation and maintenance manual details full technical clearances, lubrication standards, fuel injection valve maintenance, valve clearance adjustments, and scheduled service protocols.

🔧 Need Real-Time Technical Calculators?

Convert fastener torque (Nm ↔ ft-lb), calculate cylinder displacement, or check turbo boost pressure ratio.

🔧 Complete Technical Specifications & Torque Sequences

Reference the OEM factory tightening torques, clearances, and operational parameters for Caterpillar D398 V12 Heavy Marine & Industrial Diesel Engine below:

Engine ModelCaterpillar D398 V12 Diesel (Series 66B / 75B)
Configuration60-Degree V-Form, 12-Cylinder, 4-Stroke Diesel
Cylinder Bore6.25 in (158.75 mm)
Piston Stroke8.00 in (203.2 mm)
Total Displacement29.4 Liters (1,786 Cubic Inches)
Aspiration & InductionTurbocharged with Water-Cooled Aftercooling (TA)
Horsepower RatingUp to 1,075 BHP @ 1,300 RPM (Continuous Marine / Industrial)
Direction of RotationStandard Counterclockwise (viewed from flywheel end)
Cold Valve Lash (Inlet)0.015 in (0.38 mm)
Cold Valve Lash (Exhaust)0.035 in (0.89 mm)
Compression Release Clearance0.025 to 0.030 in (0.64 to 0.76 mm)
Crankcase Lubricating Oil Capacity70.0 US Gallons (266 Liters) with filter and cooler
Total Cooling System CapacityEngine Only: 63.5 US Gal (240 L) / With Radiator: 112 US Gal (424 L)
Starting SystemDual Electric, Compressed Air Starting Motor, or Auxiliary Gas Engine
Air Starter Lubricator Setting4 drops per minute of light oil in active air stream
Dry Engine WeightApprox. 13,800 lbs (6,260 kg)

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📖 Workshop Service Manual Table of Contents

This unbundled factory manual covers full overhaul, diagnostic procedures, and disassembly protocols:

  1. General Information, Safety Precautions & Model Identification (66B & 75B)
  2. Pre-Start Inspection: Lubricating Oil, Coolant & Air Starting Oiler Checks
  3. Engine Operation: Warm-Up, Operating Range, Oil Pressure & Emergency Stop
  4. Scheduled Maintenance Guides (Every 10, 50, 125, 250, 500 & 2000 Hours)
  5. Cylinder Head Inspection, Valve Rotators & Cold Valve Clearance (0.015 / 0.035 in)
  6. Fuel Injection Valves & Pre-Combustion Chambers: Removal, Cleaning & Testing
  7. Lubricating System: Crankcase Draining, Multi-Element Filter Replacement & S-O-S
  8. Cooling System Care: Water-Cooled Manifolds, Thermostats & Inhibitor Maintenance
  9. Air Induction & Turbochargers: Dry-Type Air Cleaners & Exhaust Aftercooler Care
  10. Storage & Lay-Up Protocols: Marine Winterization & Long-Term Preservation

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