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Deutz BF6M1012 Engine

The Deutz BF6M1012 is a liquid-cooled, four-stroke, direct-injection diesel engine featuring an in-line 6-cylinder configuration and turbocharging. Engineered for heavy-duty industrial, agricultural, and construction equipment, this power unit is recognized for its compact design, high power-to-volume ratio, and robust durability under continuous load conditions. The engine utilizes an integrated or external liquid cooling system and an advanced high-pressure fuel injection system to meet demanding performance requirements while maintaining fuel efficiency.

The engine features an overhead valve (OHV) configuration with 2 valves per cylinder (1 intake and 1 exhaust valve, totaling 12 valves). The valves are actuated by a single, gear-driven camshaft located in the engine block via pushrods and rocker arms. Valve clearance adjustments must be performed manually at the rocker screws during scheduled maintenance intervals. The cylinder bore measures exactly 94 mm (3.70 in), and the piston stroke measures 115 mm (4.53 in). This under-square architecture (stroke greater than bore) optimizes low-end torque delivery and thermal efficiency. The total displacement of this 6-cylinder block is 4.78 liters (4764 cc).

Fuel delivery is managed via individual high-pressure injection pumps (the Deutz Unit Pump System, or UPS), where each cylinder has its own dedicated pump element driven directly by the camshaft. High-pressure fuel lines connect each pump unit to a multi-hole direct-injection nozzle located centrally in the cylinder head. Fuel is drawn from the tank by a mechanical feed pump, passed through a primary water separator and a fine fuel filter element, and delivered to the injection pumps. Engine speed regulation is controlled via a mechanical centrifugal governor or an electronic governor unit acting on the control rod.

The engine utilizes a forced-feed circulation lubrication system driven by a gear-type oil pump integrated into the front gear train. Oil is drawn through a pickup screen in the oil pan, passed through a full-flow cartridge filter, and routed via internal oil galleries to the main bearings, connecting rod bearings, and camshaft. A pressure relief valve regulates system pressure, while integrated oil spray nozzles provide targeted piston crown cooling. An integrated liquid-to-oil cooler maintains oil temperature within optimal operating limits.

The cooling architecture relies on a closed-circuit liquid cooling system circulated by a belt-driven centrifugal water pump. The system features a bypass-type thermostat that regulates coolant flow between the engine block and the radiator to ensure rapid warm-up and stable operating temperatures. The cylinder head and engine block feature optimized internal cooling jackets to prevent hot spots around the exhaust ports and fuel injectors.

General Technical Data

Engine Specifications

Engine Model ............... Deutz BF6M1012
Engine Type ............... 4-stroke inline 6-cylinder direct injection liquid-cooled turbocharged diesel
Number of Cylinders ............... 6
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.70 (94.0)
Engine Stroke, in (mm) ............... 4.53 (115.0)
Displacement, cu.in (L) ............... 292.3 (4.79)
Rated Engine Power, hp (kW) ............... 124.7 (93.0)
Rated Engine Speed, rpm ............... 2500
Peak Torque ............... 447 Nm (329.6 lb-ft) at 1500 rpm
Minimum Idle Speed, rpm ............... 650
Aspiration Type ............... Turbocharged
Compression Ratio ............... 17.5:1
Firing Order ............... 1-5-3-6-2-4
Valve Configuration ............... 2 valves per cylinder design overhead layout
Cylinder Block Type ............... Cast iron with wet liners
Cylinder Head Type ............... Single cast iron block crossflow design
Lubrication System ............... Forced feed full-pressure oil circuit
Oil Pump Type ............... Gear-driven integrated rotary pump
Oil Filter Type ............... Full-flow spin-on cartridge oil filtration
Cooling System ............... Thermostatically controlled liquid cooling
Water Pump Type ............... Belt-driven internal centrifugal pump
Air Cleaner Type ............... Dry heavy duty dual-stage system
Starting System ............... Electric starter motor actuation
Electrical System ............... 12V or 24V options
Alternator Rating, Amps ............... 55 or 80 variants

Fuel System

Fuel Injection Pump Type ............... Bosch individual unit pumps
Injection Pump Control ............... Mechanical
Fuel Injection Pressure, psi (bar) ............... 23206.0 (1600.0)
Fuel Injector Type ............... Multi-hole precision atomizing nozzles assembly units
Fuel Injector Opening Pressure, psi (bar) ............... 3625.0 (250.0)
Feed Pump Type ............... Camshaft driven, plunger
Fuel Filter System Type ............... Spin-on canister fuel cartridge element
Governor Type ............... Mechanical centrifugal or optional electronic
Fuel Lift Pump Supply Pressure, psi (bar) ............... 14.5-29.0 (1.0-2.0)
Fuel System Venting Mechanism ............... Manual bleeding screw element

Dimensions and Weight

Overall Length, in (mm) ............... 44.1 (1120.0)
Overall Width, in (mm) ............... 26.7 (678.0)
Overall Height, in (mm) ............... 32.8 (834.0)
Total Dry Weight, lbs (kg) ............... 1091.3 (495.0)
Total Wet Weight, lbs (kg) ............... 1157.4 (525.0)

Maintenance Data

Service Information

Compression Pressure, psi (bar) ............... 362.5-435.1 (25.0-30.0)
Coolant Thermostat Opening Temp, F (C) ............... 181.4 (83.0)
Fully Open Thermostat Temp, F (C) ............... 203.0 (95.0)
Minimum Oil Pressure at Low Idle, psi (bar) ............... 11.6 (0.8)
Minimum Oil Pressure at Rated Speed, psi (bar) ............... 43.5 (3.0)
Intake Valve Clearance, in (mm) ............... 0.012 (0.30)
Exhaust Valve Clearance, in (mm) ............... 0.020 (0.50)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, 15W-40
API Service Classifications ......................... CH-4, CI-4
Engine Oil Capacity High Level, qts (L) ............... 14.8 (14.0)
Engine Oil Capacity Low Level, qts (L) ............... 11.6 (11.0)
Total Engine Oil Capacity, qts (L) ............... 16.4 (15.5)
Engine Coolant Capacity, qts (L) ............... 10.0 (9.5)

Service Intervals

Change oil and filter ............... Every 500 hours
Replace fuel filters ............... Every 500 hours
Inspect air filter ............... Every 100 hours
Change coolant ............... Every 2 years
Replace air filter ............... Every 500 hours
Valve clearance adjustment ............... Every 1000 hours
Change coolant ............... 1000 hours or 2 years
Fuel system inspection ............... Every 1500 hours
Compression test ............... Every 3000 hours
Drain water separator ............... As required
Belt inspection ............... As required

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ................ 3.7008 (94.00)
Crankshaft Journal Outside Diameter, in (mm) ................ 2.7559 (70.00)
Crank Pin Outside Diameter, in (mm) ................ 2.1654 (55.00)
Crankshaft End Play, in (mm) ................ 0.0039-0.0118 (0.10-0.30)
Crankshaft End Play, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Connecting Rod Journal Outside Diameter, in (mm) ............... 2.202 (55.94)
Intake Valve Stem Outside Diameter, in (mm) ................ 0.3142 (7.98)
Exhaust Valve Stem Outside Diameter, in (mm) ................ 0.3134 (7.96)
Intake Valve Guide Inside Diameter, in (mm) ................ 0.3150 (8.00)
Exhaust Valve Guide Inside Diameter, in (mm) ................ 0.3150 (8.00)
Intake Valve Stem to Guide Clearance, in (mm) ................ 0.0024 (0.06)
Exhaust Valve Stem to Guide Clearance, in (mm) ................ 0.0031 (0.08)
Intake Valve Spring Free Length, in (mm) ................ 2.3228 (59.00)
Exhaust Valve Spring Free Length, in (mm) ................ 2.3228 (59.00)
Intake Cam Height, in (mm) ................ 1.8819 (47.80)
Exhaust Cam Height, in (mm) ................ 1.8819 (47.80)
Piston Pin Outside Diameter, in (mm) ................ 1.3386 (34.00)
Piston Pin to Piston Bore Clearance, in (mm) ................ 0.0002-0.0005 (0.004-0.012)
Top Ring Side Clearance, in (mm) ................ 0.0035-0.0047 (0.09-0.12)
Second Ring Side Clearance, in (mm) ................ 0.0024-0.0035 (0.06-0.09)
Oil Ring Side Clearance, in (mm) ................ 0.0016-0.0028 (0.04-0.07)
Top Ring End Gap, in (mm) ................ 0.0315 (0.80)
Second Ring End Gap, in (mm) ................ 0.0709 (1.80)
Oil Ring End Gap, in (mm) ................ 0.0354 (0.90)

Tightening Torque Specs

Cylinder Head Bolts, Step 1 ................ 30 Nm (22 lb-ft)
Cylinder Head Bolts, Step 2 ................ 60 Nm (44 lb-ft)
Cylinder Head Bolts, Step 3 ................ 90 Nm (66 lb-ft)
Cylinder Head Bolts, Step 4 (final) ................ 120 Nm (89 lb-ft)
Connecting Rod Cap Bolts ................ 65-70 Nm (48-52 lb-ft)
Main Bearing Cap Bolts ................ 100-110 Nm (74-81 lb-ft)
Flywheel Bolts (to Crankshaft Flange) ................ 95-105 Nm (70-77 lb-ft)
Crankshaft Pulley Bolt (Front Damper) ................ 250-280 Nm (184-207 lb-ft)
Camshaft Drive Gear Bolt ................ 80-90 Nm (59-66 lb-ft)
Individual Injection Pump Mounting Nuts (to Crankcase) ................ 25-30 Nm (18-22 lb-ft)
High-Pressure Injection Lines (Injector End, Pump End) ................ 25 Nm (18 lb-ft)
Injector Hold-Down Clamp Bolts ................ 25-30 Nm (18-22 lb-ft)
Intake Manifold Bolts ................ 20-25 Nm (15-18 lb-ft)
Exhaust Manifold Nuts (to Cylinder Head) ................ 30-35 Nm (22-26 lb-ft)
Turbocharger Mounting Nuts (to Exhaust Manifold) ................ 40-45 Nm (30-33 lb-ft)
Turbocharger Oil Feed Line Fittings ................ 20-25 Nm (15-18 lb-ft)
Oil Pan Bolts (Stamped Steel Pan) ................ 12-15 Nm (9-11 lb-ft)
Valve Cover Bolts (Perimeter and Center) ................ 8-10 Nm (6-7 lb-ft)
Thermostat Housing Bolts ................ 15-20 Nm (11-15 lb-ft)
Water Pump Mounting Bolts (to Cylinder Block) ................ 20-25 Nm (15-18 lb-ft)
Starter Motor Mounting Bolts ................ 40-45 Nm (30-33 lb-ft)
Alternator Mounting Bracket Bolts ................ 30-35 Nm (22-26 lb-ft)
Engine Mount Feet Bolts (to Block) ................ 60-70 Nm (44-52 lb-ft)
Oil Drain Plug (Oil Pan) ................ 35-40 Nm (26-30 lb-ft)

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• Deutz Engines Specs
  
• Deutz BF4M1012 Specs
  
• Deutz BF4M1012E Specs
  
• Deutz BF4M1012EC Specs
  
• Deutz BF4M1012C Specs
  
• Deutz BF6M1012E Specs
  

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