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Hatz 1D50 Engine

The Hatz 1D50 is a heavy-duty, air-cooled, single-cylinder, 4-stroke industrial diesel engine belonging to the premier Hatz D-Series. Known for its robust design, compact form factor, and low operational noise, it features a unique counter-balancing mass mechanism to suppress the vibrations typical of single-cylinder powertrains. Constructed with a lightweight die-cast alloy crankcase and a durable gray cast iron cylinder, it is built to operate under demanding environmental conditions. This naturally aspirated engine conforms to modern emissions standards, including EU Stage V and US EPA Tier 4 final compliance.

The overhead valve (OHV) assembly follows a traditional 4-stroke architecture featuring two valves per cylinder (one intake and one exhaust valve). The valves are mechanically actuated through pushrods, tappets, and a single camshaft. The system requires routine operational maintenance with manual tappet clearance checks and adjustments specified at intervals of every 250 running hours. Bore: 97 mm. Stroke: 70 mm. Total Displacement: 0.517 liters (517 cc).

Lubrication System: The engine uses a high-pressure forced lubrication system regulated by a dedicated oil pressure relief and overpressure valve mechanism. Oil is driven continuously via an integrated oil pump through a fine-mesh oil filter cartridge to safeguard the plain bearings of the crankshaft and connecting rod. A mechanical oil pressure monitor is built directly into the block.

Cooling System: The power plant utilizes an integrated air-cooling configuration. Airflow is continuously pulled and channeled across the engine block and cylinder fins by an internal flywheel cooling fan built directly into the flywheel assembly. This eliminates external cooling fluid pumps or radiators, maximizing thermal efficiency across high ambient conditions.

Fuel System: The fuel setup is engineered around a highly efficient mechanical direct injection configuration. Fuel delivery relies on an inline mechanical injection pump feeding a high-precision multi-orifice injection nozzle tip directly into the piston combustion bowl. The system features a dedicated primary fuel filter cartridge paired alongside a visible water trap separator assembly to protect critical fuel components against moisture or particulate fouling. It operates safely under standard commercial ultra-low sulfur diesel fuel types meeting EN 590, BS 2869, or ASTM D 975 regulatory compliance profiles.

General Technical Data

Engine Specifications

Engine Model ............... Hatz 1D50
Engine Type ............... 4-stroke single-cylinder direct injection air-cooled diesel
Number of Cylinders ............... 1
Engine Bore, in (mm) ............... 3.82 (97.0)
Engine Stroke, in (mm) ............... 2.76 (70.0)
Displacement, cu.in (L) ............... 31.5 (0.517)
Rated Engine Power, hp (kW) ............... 4.4-10.6 (3.3-7.9)
Rated Engine Speed, rpm ............... 1500-3600
Peak Torque ............... 27.8 Nm (20.5 lb-ft) at 2000 rpm
Minimum Idle Speed ............... 850-950 rpm
Aspiration Type ............... Naturally Aspirated
Compression Ratio ............... 20.5:1
Combustion Principle ............... Direct multi-hole nozzle injection
Direction of Rotation ............... Counter-clockwise (left hand) when viewing flywheel
Cylinder Block Material ............... Grey cast iron
Crankcase Material ............... Die-cast light alloy
Cylinder Head Type ............... Light alloy overhead valve structure
Lubrication System ............... Full-pressure lubrication circuit
Oil Pump Type ............... Gear-driven displacement pump
Oil Filter Type ............... Full-flow spin-on cartridge type
Cooling System ............... Axial flywheel fan air cooling
Air Cleaner Type ............... Dry type element or oil bath assembly
Crankcase Breather System ............... Closed system venting into intake port
Decompression Mechanism ............... Automatic mechanical decompression lever
Exhaust System ............... Integrated silencer box assembly
Emission Certification ............... EPA Tier 4 Final and EU Stage V compliant
Starting System ............... Crankhandle mechanical or electric motor starter
Electrical System ............... 12V or 24V configurations
Charging Alternator ............... Flywheel integrated alternator design
Alternator Output 12V, A ............... 14
Alternator Output 24V, A ............... 7

Fuel System

Injection Pump Variant ............... Hatz single-element high-pressure pump
Injection Nozzle Type ............... Multi-hole direct injection nozzle
Fuel Injection Pressure, psi (bar) ............... 3625-3916 (250-270)
Fuel Feed Pump Type ............... Mechanical diaphragm pump
Fuel Bleeding Method ............... Automatic venting mechanism
Manual Venting Screw Location ............... Injection pump bleeder valve
Governor Type ............... Mechanical centrifugal governor system
Fuel Filter System ............... Spin-on main element with optional water separator
Fuel Specification Standard ............... EN 590, BS 2869 A1/A2, ASTM D 975
Fuel Tank Capacity, gal (L) ............... 1.32-2.37 (5.0-9.0) depending on variant
Maximum Permissible Fuel Return Line Pressure, psi (bar) ............... 2.9 (0.2)
Cold Start Device ............... Automatic extra fuel device feature
Pre-Glow Heating System ............... Optional 12V / 24V glow plug installation
Maximum Fuel Suction Height, ft (m) ............... 3.3 (1.0)
Fuel Line Diameter (Supply Internal), in (mm) ............... 0.23 (6.0)
Fuel Line Diameter (Return Internal), in (mm) ............... 0.15 (4.0)
Injection Timing (Static Advance) ............... 10-12 degrees BTDC

Dimensions and Weight

Overall Length, in (mm) ............... 13.4-18.2 (340-465)
Overall Width, in (mm) ............... 17.4-18.2 (445-465)
Overall Height, in (mm) ............... 21.0 (533)
Dry Weight (Standard Model), lbs (kg) ............... 183 (83)
Dry Weight (Crankstart Base), lbs (kg) ............... 172 (78)

Maintenance Data

Service Information

Compression Pressure Range, psi (bar) ............... 406-464 (28.0-32.0)
Minimum Oil Pressure at 850 rpm, psi (bar) ............... 8.7 (0.6)
Operating Oil Pressure at 3000 rpm, psi (bar) ............... 36.2-65.2 (2.5-4.5)
Maximum Oil Temperature in Sump, F (C) ............... 248 (120)
Intake Valve Clearance (Cold), in (mm) ............... 0.0039 (0.10)
Exhaust Valve Clearance (Cold), in (mm) ............... 0.0078 (0.20)

Engine Oil

Engine Oil Type .................. SAE 10W-40, SAE 10W-30, or 15W-40
API Service Classifications ......................... CH-4, or CJ-4
Engine Oil Capacity, Max, qt (L) ............... 1.58 (1.5)
Engine Oil Capacity, Min, qt (L) ............... 1.05 (1.0)

Service Intervals

Change engine oil ............... Every 250 hours
Replace oil filter ............... Every 250 hours
Replace air filter ............... Every 500 hours
Replace fuel filter ............... Every 500 hours
Valve clearance adjustment ............... Every 250 hours
Fuel system inspection ............... Every 500 hours
Clean cooling fin ............... Every 250 hours
Check battery ............... Every 250 hours
Inspect breather Valve ............... Every 1000 hours

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ............... 3.8188-3.8196 (97.000-97.022)
Cylinder Bore Maximum Wear Limit, in (mm) ............... 3.8236 (97.120)
Cylinder Bore Maximum Out-of-Round, in (mm) ............... 0.0011 (0.030)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.1813-1.1816 (30.007-30.018)
Connecting Rod Big End Journal I.D, in (mm) ............... 2.3622-2.3628 (60.000-60.015)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0014-0.0031 (0.036-0.080)
Connecting Rod Big End Side Clearance, in (mm) ............... 0.0039-0.0078 (0.100-0.200)
Crankshaft Main Journal Diameter, in (mm) ............... 2.3614-2.3622 (59.980-60.000)
Crankshaft Main Bearing Diameter, in (mm) ............... 2.3582 (59.900)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0015-0.0035 (0.040-0.090)
Crankpin Journal Diameter, in (mm) ............... 2.1645-2.1653 (54.980-55.000)
Crankpin Bearing Clearance, in (mm) ............... 0.0011-0.0031 (0.030-0.080)
Crankshaft End Play, in (mm) ............... 0.0020-0.0059 (0.050-0.150)
Piston Skirt Outer Diameter, in (mm) ............... 3.8153-3.8161 (96.910-96.930)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0027-0.0044 (0.070-0.112)
Piston Pin Bore Inside Diameter, in (mm) ............... 1.1812-1.1814 (30.003-30.008)
Piston Pin Outer Diameter, in (mm) ............... 1.1809-1.1811 (29.995-30.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0001-0.0005 (0.003-0.013)
Piston Pin to Small End Bushing Clearance, in (mm) ............... 0.0003-0.0011 (0.008-0.028)
Top Ring Groove Width, in (mm) ............... 0.0787-0.0795 (2.000-2.020)
Second Ring Groove Width, in (mm) ............... 0.0787-0.0795 (2.000-2.020)
Oil Ring Groove Width, in (mm) ............... 0.1574-0.1582 (4.000-4.020)
Top Ring End Gap, in (mm) ............... 0.0098-0.0157 (0.250-0.400)
Second Ring End Gap, in (mm) ............... 0.0098-0.0157 (0.250-0.400)
Oil Ring End Gap, in (mm) ............... 0.0098-0.0157 (0.250-0.400)
Top Ring Side Clearance, in (mm) ............... 0.0019-0.0035 (0.050-0.090)
Second Ring Side Clearance, in (mm) ............... 0.0015-0.0027 (0.040-0.070)
Oil Ring Side Clearance, in (mm) ............... 0.0011-0.0025 (0.030-0.065)
Cylinder Head Flatness Distortion, Maximum, in (mm) ............... 0.0019 (0.050)
Valve Guide Inside Diameter, in (mm) ............... 0.3153-0.3161 (8.010-8.030)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.3137-0.3143 (7.968-7.982)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.3129-0.3136 (7.950-7.965)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0011-0.0024 (0.028-0.062)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0017-0.0031 (0.045-0.080)
Intake Valve Head Thickness, in (mm) ............... 0.0472-0.0551 (1.200-1.400)
Exhaust Valve Head Thickness, in (mm) ............... 0.0433-0.0511 (1.100-1.300)
Valve Head Recession Depth, in (mm) ............... 0.0275-0.0433 (0.700-1.100)
Valve Seat Contact Width, in (mm) ............... 0.0590-0.0787 (1.500-2.000)
Valve Spring Free Length, in (mm) ............... 1.732 (44.00)
Camshaft Bearing Journal Diameter, in (mm) ............... 1.5740-1.5748 (39.980-40.000)
Camshaft Bearing Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.070)
Camshaft End Play, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.5505-0.5511 (13.984-14.000)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.5518-0.5524 (14.016-14.034)
Rocker Arm Bushing-to-Shaft Clearance, in (mm) ............... 0.0006-0.0019 (0.016-0.050)
Crankshaft Timing Gear Journal Diameter, in (mm) ............... 1.3775-1.3781 (34.989-35.000)
Camshaft Timing Gear Journal Diameter, in (mm) ............... 1.1807-1.1812 (29.990-30.002)

Tightening Torques

Cylinder Head Nut (1-Stage) ............... 22.1 lb-ft (30.0 Nm)
Cylinder Head Nut (2-Stage) ............... 55.3 lb-ft (75.0 Nm)
Connecting Rod Cap Bolt ............... 36.8 lb-ft (50.0 Nm)
Main Bearing Block Housing Fasteners ............... 36.8 lb-ft (50.0 Nm)
Flywheel Central Screw Base ............... 103.2 lb-ft (140.0 Nm)
Crankcase Breather Deck Plate Screws ............... 7.3 lb-ft (10.0 Nm)
Cylinder Head Cover Center Nut ............... 8.8 lb-ft (12.0 Nm)
Oil Sump Pan Flange Fasteners ............... 7.3 lb-ft (10.0 Nm)
Engine Oil Drain Plug ............... 36.8 lb-ft (50.0 Nm)
Oil Pressure Switch ............... 14.7 lb-ft (20.0 Nm)
Oil Pump Assembly Plate Screws ............... 7.3 lb-ft (10.0 Nm)
Injection Pump to Case Nuts ............... 20.6 lb-ft (28.0 Nm)
Fuel Injector Hold-Down Clamp Stud Nut ............... 25.8 lb-ft (35.0 Nm)
High-Pressure Fuel Injection Line Unions ............... 18.4 lb-ft (25.0 Nm)
Fuel Feed Pump Flange Mounting Screws ............... 11.0 lb-ft (15.0 Nm)
Timing Gear Cover Assembly Housing Bolts ............... 8.8 lb-ft (12.0 Nm)
Camshaft Axial Thrust Washer Screw ............... 7.3 lb-ft (10.0 Nm)
Rocker Arm Shaft Pillar Support Fastener ............... 18.4 lb-ft (25.0 Nm)
Exhaust Silencer Box Nut Flange ............... 20.6 lb-ft (28.0 Nm)
Air Filter Housing Support Bolts ............... 7.3 lb-ft (10.0 Nm)
Starter Motor Mounting Hex Bolt ............... 33.1 lb-ft (45.0 Nm)
Integrated Charging Stator Screws ............... 5.1 lb-ft (7.0 Nm)
Governor Control Lever Mechanism Locknut ............... 7.3 lb-ft (10.0 Nm)
Engine Mounting Bracket Outer Frame Fasteners ............... 55.3 lb-ft (75.0 Nm)
Speed Control Assembly Housing Screws ............... 4.7 lb-ft (6.5 Nm)
Decompression Control Housing Screws ............... 7.3 lb-ft (10.0 Nm)
Breather Valve Spring Deck Capscrew ............... 4.4 lb-ft (6.0 Nm)
Flywheel Cooling Fan Ring Attachment Fasteners ............... 7.3 lb-ft (10.0 Nm)
Fuel Tank Base Strap Retaining Nuts ............... 14.7 lb-ft (20.0 Nm)
Oil Pressure Relief Valve Hex Cap Nut ............... 29.5 lb-ft (40.0 Nm)
Crankcase Structural Tie-Rod Fastener ............... 22.1 lb-ft (30.0 Nm)
Valve Tappet Adjuster Screw Locknut ............... 8.8 lb-ft (12.0 Nm)
Intermediate Adaptor Housing Flange Bolts ............... 33.1 lb-ft (45.0 Nm)
Alternator Cable Junction Post Small Nut ............... 2.9 lb-ft (4.0 Nm)

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• Hatz Engines Specs
  
• Hatz 1D41 Specs
  
• Hatz 1D41S Specs
  
• Hatz 1D42 Specs
  
• Hatz 1D42S Specs
  
• Hatz 1D50S Specs
  
• Hatz 1D50Z Specs
  

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