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Cummins NTA-855-L4 Big Cam Heavy Duty Diesel Engine Maintenance Manual

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Cummins NTA-855-L4 Big Cam Heavy Duty Diesel Engine Maintenance Manual

Factory Workshop Reference • 100% Free ($0.00)

Cummins NTA-855 (Big Cam I, II, III & IV)

DISPLACEMENT
14.0 Litres (855 cu in) Turbocharged & Aftercooled

CYLINDER HEAD TORQUE
Step 1: 136 Nm / Step 2: 298 Nm / Step 3: 407 Nm (300 ft-lb)

COLD VALVE LASH
Inlet 0.28 mm (0.011 in) / Exhaust 0.58 mm (0.023 in)

OIL CAPACITY
36.0 Litres (9.5 US Gallons) 15W-40

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

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Official 252-page factory technical maintenance and intermediate overhaul manual for Cummins NTA-855-L4 Big Cam heavy-duty diesel engines. Covers comprehensive maintenance, cylinder head bolt torque sequences, main bearing clearances, PT (pressure-time) fuel pump calibration, injector timing, and cooling system maintenance protocols across agricultural, industrial generator, and commercial marine applications.

🔧 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 Cummins NTA-855 (Big Cam I, II, III & IV) below:

Engine Architecture4-Stroke, Inline 6-Cylinder, Turbocharged, Jacket-Water / Aftercooled
Displacement14.0 Litres (855 cubic inches)
Bore and Stroke140 mm x 152 mm (5.50 in x 6.00 in)
Firing Order1-5-3-6-2-4
Cylinder Head Capscrews TorqueStep 1: 136 Nm (100 lbf·ft) -> Step 2: 298 Nm (220 lbf·ft) -> Step 3: 407 Nm (300 lbf·ft)
Main Bearing Cap BoltsStep 1: 122 Nm (90 lbf·ft) -> Step 2: 346 Nm (255 lbf·ft) -> Step 3: Loosen -> Step 4: 122 Nm -> Step 5: 346 Nm
Connecting Rod CapscrewsStep 1: 95 Nm (70 lbf·ft) -> Step 2: 190 Nm (140 lbf·ft) -> Step 3: 285 Nm (210 lbf·ft)
Flywheel Mounting Capscrews271 Nm (200 lbf·ft) with clean engine oil
Cold Valve Lash ClearancesInlet: 0.28 mm (0.011 in) / Exhaust: 0.58 mm (0.023 in)
Injector Lash (OBC Adjustment)Zero lash + 90° (0.024 in dial indicator deflection on Big Cam III/IV)
PT Fuel Pump Rail PressureIdle: 20 to 35 psi / High Idle: 160 to 185 psi @ rated speed
Standard Oil Sump Capacity36.0 Litres (9.5 US Gal) – Low: 30.0 L / High: 36.0 L

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📖 Workshop Service Manual Table of Contents

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

  1. (‘Section 1: General Engine Information & Safety’, ‘Identification plates, horsepower ratings (335HP to 450HP), and lifting instructions.’)
  2. (‘Section 2: Maintenance Specifications & Clearances’, ‘Cylinder liner protrusion, piston ring end gaps, and crankshaft journal wear limits.’)
  3. (‘Section 3: Cylinder Head Assembly & Valve Adjustment’, ‘Crosshead adjustment procedure, valve spring test force, and cylinder head torque steps.’)
  4. (‘Section 4: Rocker Lever Assemblies & Push Tubes’, ‘Rocker bushing tolerances, shaft lubrication holes, and cam follower rollers.’)
  5. (‘Section 5: Camshaft & Timing Gear Train’, ‘Front gear train backlash (0.005 to 0.017 in), timing key alignment, and camshaft thrust plate.’)
  6. (‘Section 6: Cummins PT Fuel System’, ‘PTG governor calibration, fuel manifold pressure testing, and top-stop injector adjustments.’)
  7. (‘Section 7: Lubrication System & Oil Pump’, ‘High-capacity gear pump, full-flow filter head, bypass relief valve, and oil cooler core.’)
  8. (‘Section 8: Cooling System & Water Pump’, ‘Water pump rebuild, dual thermostat operation, fan belt tensioning, and corrosion resistor filter.’)
  9. (‘Section 9: Air Intake & Turbocharger Maintenance’, ‘Holset T-46 and HT3B turbocharger radial/axial play inspection, and exhaust manifold torques.’)
  10. (‘Section 10: Troubleshooting Trees & Symptom Guide’, ‘Hard starting, crankcase blowby, low oil pressure, and dark smoke diagnostic flowcharts.’)

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