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Cummins 6T-830 Engine

The Cummins 6T830 (Case-IH CNH for agricultural and construction applications) is a heavy-duty, 8.3-liter, 4-stroke, inline 6-cylinder industrial diesel engine. Belonging to the legacy Cummins C-Series (6C or 6CT8.3) platform, this engine is engineered for high-torque, severe-duty environments, commonly powering large agricultural tractors, wheel loaders, dozers, and excavators. Structurally, it features a robust cast-iron cylinder block with replaceable wet-rim cylinder liners to allow for efficient lower-end rebuilds and superior heat dissipation. The 6T-830 nomenclature designates a 6-cylinder configuration, Turbocharged aspiration, and an 8.3-liter nominal displacement.

It relies strictly on mechanical subsystems to maximize reliability and simplify field maintenance in heavy industrial environments. The nominal cylinder bore is 114 mm (4.49 in). The piston stroke length is 135 mm (5.32 in). The cylinder head utilizes a durable single-piece crossflow cast-iron design containing 2 valves per cylinder (12 valves total) operated by a traditional pushrod and overhead rocker arm assembly. Valve clearance adjustments are performed mechanically using the rocker arm adjusting screws. The standard maintenance overhead workshop specifications dictate a cold intake valve lash setting of 0.305 mm (0.012 in) and a cold exhaust valve lash setting of 0.610 mm (0.024 in).

The fuel architecture relies entirely on a rugged, high-pressure mechanical injection system. Primary fuel draw from the storage tank is handled by a block-mounted, mechanical diaphragm lift pump equipped with a manual priming lever. Pressurization and timing delivery are executed by a Bosch inline mechanical fuel injection pump (Bosch P-Pump or A-Pump variant) driven directly via the engine front gear train. Mechanics configure speed regulations using an integrated multi-weight mechanical governor. High-pressure fuel lines route directly to mechanical multi-hole injectors positioned vertically inside the cylinder head to mist fuel directly into the piston bowls.

Lubrication is managed via a full-pressure, gear-driven oil pump mounted to the front engine block structure that draws from a deep-sump metal oil pan. The minimum safe oil pressure limit at a hot idle speed is 100 kPa (15 PSI). The system configuration utilizes an internal plate-type engine oil cooler and a single, spin-on full-flow bypass filter assembly. Thermal regulation is maintained via a pressurized, forced-circulation liquid cooling loop driven by a belt-driven centrifugal water pump. Flow routing is controlled via a dual-thermostat housing design to ensure rapid engine warm-up and high transient thermal stability. Standard regulated engine operational coolant temperatures are maintained between 71C and 95C (160F to 203F).

General Technical Data

Engine Specifications

Engine Model ............... Cummins 6T-830
Engine Type ............... 4-cycle inline 6-cylinder direct injection turbocharged liquid-cooled diesel
Number of Cylinders ............... 6
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 4.49 (114.0)
Engine Stroke, in (mm) ............... 5.31 (135.0)
Displacement, cu.in (L) ............... 505 (8.3)
Rated Engine Power, hp (kW) ............... 145-280 (108-209)
Rated Engine Speed, rpm ............... 2200-2600
Peak Torque ............... 915 Nm (675 lb-ft) at 1500 rpm
Idle Speed ............... 650-750 rpm
Aspiration Type ............... Turbocharged
Compression Ratio ............... 16.5:1-18.0:1
Firing Order ............... 1-5-3-6-2-4
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Full-pressure
Oil Pump Type ............... Gear-driven
Oil Filter Type ............... Full-flow, spin-on
Cooling System ............... Liquid-cooled
Water Pump Type ............... Belt-driven, centrifugal
Air Cleaner Type ............... Dry dual-stage
Starting System ............... Electric Starter
Electrical System ............... 12V or 24V
Alternator Rating, Amps ............... 50-120

Fuel System

Fuel System ............... Direct injection
Injection Pump Type ............... Rotary or inline
Fuel System Control ............... Mechanical
Governor Type ............... Mechanical
Fuel Injector Type ............... Multi-hole
Fuel Type ............... Diesel Fuel

Dimensions and Weight

Overall Length, in (mm) ............... 43.2-47.1 (1100-1200)
Overall Width, in (mm) ............... 27.5-31.4 (700-800)
Overall Height, in (mm) ............... 43.3-47.2 (1100-1200)
Dry Weight, lbs (kg) ............... 1320-1585 (600-720)

Maintenance Data

Service Information

Thermostat begins opening ............... 82C (180F)
Thermostat fully open ............... 95C (203F)
Cooling system pressure ............... 70-100 kPa (10-15 psi)
Operating oil pressure ............... 300-450 kPa (44-65 psi)
Idle oil pressure ............... 100-150 kPa (15-22 psi)
Intake Valve Clearance, in (mm) ............... 0.012 (0.30)
Exhaust Valve Clearance, in (mm) ............... 0.024 (0.61)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, 15W-40
API Service Classifications ......................... CI-4, CJ-4, or CK-4
Engine Oil Capacity, qts (L) .................. 20.0-25.2 (19.0-24.0)
Coolant Capacity, qts (L) ............... 26.3-31.5 (25.0-30.0)

Service Intervals

Change oil and filter ............... Every 250 hours
Replace fuel filters ............... Every 500 hours
Inspect air filter ............... Every 100 hours
Replace air filter ............... Every 500 hours
Change coolant ............... Every 2000 hours
Valve-lash adjustment ............... Every 1000 hours
Injector inspection ............... Every 1500-2000 hours
Compression test ............... Every 2500 hours
Drain water separator ............... As required
Belt inspection ............... As required

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ............... 114.000-114.030 (4.4882-4.4894)
Crankshaft Journal Outside Diameter, in (mm) ............... 97.962-98.013 (3.8568-3.8588)
Crank Pin Outside Diameter, in (mm) ............... 75.962-76.013 (2.9906-2.9926)
Crankshaft End Play, in (mm) ............... 0.130-0.380 (0.0051-0.0150)
Intake Valve Stem Outside Diameter, in (mm) ............... 9.451-9.479 (0.3721-0.3732)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 9.431-9.459 (0.3713-0.3724)
Intake Valve Guide Inside Diameter, in (mm) ............... 9.512-9.550 (0.3745-0.3760)
Exhaust Valve Guide Inside Diameter, in (mm) ............... 9.512-9.550 (0.3745-0.3760)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.033-0.099 (0.0013-0.0039)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.053-0.119 (0.0021-0.0047)
Intake Valve Spring Free Length, in (mm) ............... 60.10 (2.366)
Exhaust Valve Spring Free Length, in (mm) ............... 60.10 (2.366)
Intake Cam Height, in (mm) ............... 47.78-48.42 (1.881-1.906)
Exhaust Cam Height, in (mm) ............... 48.22-48.86 (1.898-1.924)
Piston Pin Outside Diameter, in (mm) ............... 44.993-45.005 (1.7714-1.7719)
Piston Pin to Piston Bore Clearance, in (mm) ............... 0.005-0.021 (0.0002-0.0008)
Second Ring Side Clearance, in (mm) ............... 0.040-0.085 (0.0016-0.0033)
Oil Ring Side Clearance, in (mm) ............... 0.030-0.075 (0.0012-0.0030)
Top Ring End Gap, in (mm) ............... 0.30-0.55 (0.0118-0.0217)
Second Ring End Gap, in (mm) ............... 0.40-0.65 (0.0157-0.0256)
Oil Ring End Gap, in (mm) ............... 0.25-0.55 (0.0098-0.0217)

Tightening Torque Specs

Cylinder Head Bolts, Step 1 ............... 80 Nm (59 lb-ft)
Cylinder Head Bolts, Step 2 ............... 140 Nm (103 lb-ft)
Connecting Rod Cap Bolts ............... 55 Nm (41 lb-ft)
Main Bearing Cap Bolts ............... 70 Nm (52 lb-ft)
Flywheel to Crankshaft ............... 210 Nm (155 lb-ft)
Flywheel Housing to Cylinder Block ............... 70 Nm (52 lb-ft)
Rocker Lever Support Bolts ............... 80 Nm (59 lb-ft)
Injector Hold-Down Clamp ............... 20 Nm (15 lb-ft)
Injection Pump Gear Nut ............... 115 Nm (85 lb-ft)
Crankshaft Damper Bolts ............... 230 Nm (170 lb-ft)

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