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Hatz 1D50Z Engine

The Hatz 1D50Z is an air-cooled, single-cylinder, 4-stroke industrial diesel engine belonging to the robust Hatz D-Series. Designed for heavy-duty applications in construction machinery, pumps, and generators, it features a vertical cylinder configuration and a lightweight, die-cast light alloy crankcase paired with a durable gray cast iron cylinder. The "Z" designation indicates the integration of counterbalancing weights (Zusatzmasse) on the crankshaft and flywheel, which dramatically lowers first-order vibrations to deliver exceptionally quiet and smooth running performance. The engine is highly efficient and compliant with stringent emissions standards, including EU Stage V and US EPA Tier 4 Final.

The engine employs a traditional overhead valve (OHV) mechanical valve control configuration. The valve train mechanism is actuated via a gear-driven camshaft, mechanical tappets, solid push-rods, and overhead rocker arms moving the valves within an aluminum cylinder head. Valve clearances must be inspected and adjusted at regular workshop service intervals of 250 operating hours. Bore: 97 mm (3.82 inches). Stroke: 70 mm (2.76 inches). Total Displacement: 0.517 liters / 517 cc. Compression Ratio: 20.5:1.

Lubrication is managed by a full pressurized, forced-feed lubrication system driven by an internal oil pump. The system circulates oil under pressure through a replaceable fine oil filter element to supply the plain bearings of the crankshaft and connecting rod. This engine utilizes a direct air-cooling design. Forced airflow is generated by an integrated cooling fan built directly into the engine flywheel assembly. This fan forces ambient air over the cooling fins of both the gray cast iron cylinder block and the aluminum cylinder head to effectively dissipate thermal load under all climatic operating temperatures.

Fuel System: Combustion is driven by a highly precise mechanical direct fuel injection system. Fuel is drawn through an external water separator and a fine-element fuel filter before being delivered to the injection pump assembly. The mechanical injection nozzle delivers atomized fuel directly into the piston combustion bowl. Engine speed control is managed by a mechanical centrifugal governor with a static speed droop of approximately 5% at 3000 RPM. The engine requires ultra-low sulfur diesel fuel conforming to standard regulations such as EN 590, BS 2869, or ASTM D 975.

General Technical Data

Engine Specifications

Engine Model ............... Hatz 1D50Z
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 (cc) ............... 31.55 (517.0)
Rated Engine Power, hp (kW) ............... 5.0-10.6 (3.7-7.9)
Rated Engine Speed, rpm ............... 1500-3600
Peak Torque ............... 18.3 lb-ft (24.8 Nm) at 2000-2500 rpm
Idle Speed ............... 800-900 rpm
Aspiration Type ............... Naturally Aspirated
Operating Speed ............... 3000-3600 rpm
Compression Ratio ............... 20.5:1
Firing Order ............... 1-1-1-1
Cylinder Block Type ............... Die-cast light alloy crankcase with gray cast iron cylinder liner
Cylinder Head Type ............... Light alloy aluminum
Lubrication System ............... Forced-feed pressure lubrication
Oil Pump Type ............... Gear-driven trochoid pump
Oil Filter Type ............... Full-flow spin-on micro filter element
Cooling System ............... Air-cooled via axial flywheel blower fan
Air Cleaner Type ............... Dry dual-element with optional maintenance indicator
Starting System ............... Electric starter motor with optional recoil or crankhandle version
Electrical System ............... 12V or 24V integrated system
Alternator Output 12V, A ............... 14
Alternator Output 24V, A ............... 7

Fuel System

Injection Pump Type ............... Integrated single plunger high pressure block pump
Injection Pump Drive ............... Camshaft driven via roller tappet mechanism
Governor Type ............... Mechanical centrifugal multi-speed governor
Injection Nozzle Type ............... Multi-hole standard orifice nozzle assembly
Injection Pressure, psi (bar) ............... 3625-3915 (250-270)
Injection Timing, degrees BTDC ............... 11-13
Fuel Feed Pump Type ............... Mechanical diaphragm lift pump
Fuel Filter Type ............... High efficiency spin-on element with water separator reservoir
Recommended Fuel Grade ............... Ultra low sulfur diesel meeting EN 590 or ASTM D 975
Fuel Tank Capacity, gal (L) ............... 1.85 (7.0)
Fuel Return Rate, gph (L/h) ............... 0.92-1.32 (3.5-5.0)
Maximum Fuel System Suction Lift, ft (m) ............... 3.3 (1.0)
Fuel Consumption at Rated Power, gph (L/h) ............... 0.48-0.58 (1.8-2.2)
Fuel System Bleeding Method ............... Self-bleeding mechanical circuit

Dimensions and Weight

Overall Length, in (mm) ............... 17.0 (430)
Overall Width, in (mm) ............... 18.6 (470)
Overall Height, in (mm) ............... 20.16 (510)
Dry Weight, lbs (kg) ............... 183 (83)

Maintenance Data

Service Information

Compression Pressure Range, psi (bar) ............... 435-507 (30.0-35.0)
Oil Pressure at 850 rpm, psi (bar) ............... 8.7 (0.6)
Oil Pressure at 3000 rpm, psi (bar) ............... 36.3 (2.5)
Maximum Air Operating Temperature, F (C) ............... 122 (50)
Minimum Cold Start Temperature, F (C) ............... 14 (-10)
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 5W-30, or 15W-40
API Service Classifications ......................... CK-4, CJ-4, Cl-4
Engine Oil Capacity, Minimum Level Mark, qt (L) ............... 1.16 (1.1)
Engine Oil Capacity, Maximum Level Mark, qt (L) ............... 2.01 (1.9)

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)
Outer Capsule Soundproof Insulation Panels Fasteners ............... 7.0 lb-ft (9.5 Nm)

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• Hatz Engines Specs
  
• Hatz 1D41 Specs
  
• Hatz 1D41S Specs
  
• Hatz 1D42 Specs
  
• Hatz 1D42S Specs
  
• Hatz 1D50 Specs
  
• Hatz 1D50S Specs
  

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