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Hatz 1B40 Engine

The Hatz 1B40 is a compact, single-cylinder, air-cooled four-stroke diesel engine engineered for both mobile and stationary industrial applications. Developed by the German manufacturer Motorenfabrik Hatz, this B-series engine features an upright cylinder configuration and is highly regarded in harsh environments for its lightweight, die-cast light alloy crankcase construction, robust performance, and long service life. It is certified to modern environmental standards, including EU Stage V specifications.

The engine utilizes an overhead valve configuration driven by a rocker-arm and camshaft valve timing layout. In accordance with workshop service specifications, the precise valve clearance (tappet clearance) measurement must be set between 10C and 30C to 0.10 mm for both the inlet and exhaust valves. The cylinder bore measures exactly 88 mm paired with a stroke length of 76 mm, creating a total engine displacement of 462 cc (28.19 cu.in). Thermal management is handled by a robust forced-air cooling system. A dedicated fan draws cooling and combustion air through an integrated intake opening, directing high-velocity air across the cooling fins of the light alloy cylinder head and engine block.

Lubrication System: Lubrication operates via a pressurized, forced-spray system integrated with a main-flow fine filter mesh. Normal operational oil pressure is 2.5 bars measured at an oil temperature of 100C and engine speed of 3000 rpm. Fuel System: The injection system relies on a high-efficiency direct injection mechanism. The integrated fuel tank holds a standard capacity of 5.0 liters. Fuel delivery components mandate the use of standard diesel fuel conforming to regulations such as EN 590, BS 2869 A1/A2, or ASTM D 975.

General Technical Data

Engine Specifications

Engine Model ............... Hatz 1B40
Engine Type ............... 4-stroke single-cylinder direct injection air-cooled diesel
Number of Cylinders ............... 1
Engine Bore, mm (in) ............... 88.0 (3.46)
Engine Stroke, mm (in) ............... 76.0 (2.99)
Displacement, cc (cu.in) ............... 462 (28.19)
Rated Engine Power, kW (hp) ............... 3.5-7.5 (4.7-10.2) at 3600 rpm
Maximum Speed, rpm ............... 3600 +/- 150
Peak Torque, Nm (lb-ft) ............... 23.4-24.9 (17.3-18.4) at 2300 rpm
Idle Speed, rpm ............... 1000-1200
Aspiration Type ............... Naturally Aspirated
Operating Speed Range, rpm ............... 1500-3600
Compression Ratio ............... 20.5:1-21.5:1
Valve Train ............... Overhead valve config with pushrods and rocker arms
Number of Valves per Cylinder ............... 1 intake and 1 exhaust valve
Cylinder Liner Type ............... Integrated cast iron liner within alloy block
Main Bearing Type ............... Heavy-duty hydrodynamic sleeve bearings
Crankcase Material ............... Die-cast light alloy
Cylinder Head Material ............... Light alloy
Direction of Rotation ............... Anti-clockwise facing power take-off end
Lubrication System ............... Full-pressure circulation lubrication
Oil Pump Type ............... Gear-driven trochoid pump
Oil Filter Type ............... Main-flow fine mesh spin-on filter screen
Cooling System ............... Air-cooled via integrated axial fan flywheel
Air Cleaner Type ............... Dry dual-element or oil-bath configuration
Exhaust System ............... Integrated silencer with protection guard
Injection Method ............... Direct injection with multi-hole nozzle
Decompression System ............... Automatic mechanical decompression
Emission Certification ............... EU Stage V and EPA Tier 4 Final compliant
Starting System ............... Recoil starter or electric starter option
Electrical System Voltage ............... 12V
Alternator Charging Output ............... 14A or 28A

Fuel System

Injection Pump Type ............... High-pressure individual plug-in unit pump
Injection Pump Drive ............... Driven directly by camshaft fuel lobe
Injection Nozzle Type ............... Multi-hole micro-orifice nozzle injector
Injection Opening Pressure, bar (psi) ............... 240-250 (3480-3625)
Governor Type ............... Mechanical centrifugal spring-loaded governor
Fuel Feed Pump Type ............... Gravity fed or mechanical diaphragm lift pump
Fuel Filter Element ............... Spin-on fine cartridge with integrated water trap
Fuel Tank Capacity, L (US gal) ............... 5.0 (1.32)
Fuel Tank Material ............... High-density polyethylene or sheet metal
Fuel Specification Standard ............... EN 590, ASTM D 975 1D/2D, BS 2869 A1/A2
Injection Timing, degrees ............... 11-13 BTDC
Fuel Line Diameter, mm (in) ............... 6.0 (0.236)
Fuel Return Line Diameter, mm (in) ............... 4.0 (0.157)
Maximum Permissible Fuel Temperature, C (F) ............... 60 (140)
Fuel Leakage System ............... Internal collection routed back to fuel tank
Injection Pipe Wall Thickness, mm (in) ............... 2.0 (0.078)
Fuel Delivery Control ............... Mechanical rack linked directly to governor lever
Fuel Cut-off Mechanism ............... Manual stop lever or optional 12V solenoid

Dimensions and Weight

Overall Length, mm (in) ............... 390 (15.4)
Overall Width, mm (in) ............... 430 (17.0)
Overall Height, mm (in) ............... 485 (19.1)
Dry Weight with Recoil Starter, kg (lbs) ............... 53.5 (118)
Dry Weight with Electric Starter, kg (lbs) ............... 56.0 (130)

Maintenance Data

Service Information

Compression Pressure, Minimum, bar (psi) ............... 28 (406)
Oil Pressure at Low Idle, bar (psi) ............... 0.6 (8.7)
Oil Pressure at Rated Speed, bar (psi) ............... 2.5-3.0 (36.2-43.5)
Maximum Permissible Oil Temperature, C (F) ............... 130 (266)
Inlet Valve Clearance, Cold, mm (in) ............... 0.10 (0.0039)
Exhaust Valve Clearance, Cold, mm (in) ............... 0.10 (0.0039)

Engine Oil

Engine Oil Type .................. SAE 10W-40, SAE 10W-30, or 15W-40
API Service Classifications ......................... CF, CH-4, CK-4, CJ-4
Engine Oil Capacity (Maximum), L (US qt) ............... 1.5 (1.59)
Engine Oil Capacity (Minimum), L (US qt) ............... 1.0 (1.05)

Service Intervals

Change engine oil ............... Every 250 hours
Clean oil filter ............... Every 1000 hours
Clean air filter ............... Every 100 hours
Replace air filter ............... Every 500 hours
Replace fuel filter ............... Every 500 hours
Valve clearance adjustment ............... Every 250 hours
Fuel system inspection ............... Every 250 hours
Check battery ............... Every 250 hours
Inspect breather valve ............... Every 1000 hours

Service Specifications

Cylinder Bore Inside Diameter (Wear Limit), mm (in) ............... 88.15 (3.4704)
Cylinder Taper Limit Maximum, mm (in) ............... 0.040 (0.0015)
Main Bearing Clearance, mm (in) ............... 0.12 (0.0047)
Connecting Rod Bearing Clearance, mm (in) ............... 0.10 (0.0039)
Connecting Rod Small End Bushing I.D, mm (in) ............... 25.025-25.035 (0.9852-0.9856)
Connecting Rod Big End Bore Diameter, mm (in) ............... 45.000-45.015 (1.7716-1.7722)
Crankshaft Main Journal Diameter, mm (in) ............... 48.000-48.015 (1.8897-1.8903)
Crankpin Journal Diameter, mm (in) ............... 42.000-42.012 (1.6535-1.6540)
Crankshaft End Play, mm (in) ............... 0.10-0.30 (0.0039-0.0118)
Piston Outer Diameter (Wear Limit), mm (in) ............... 87.88 (3.4598)
Piston to Cylinder Bore Clearance, mm (in) ............... 0.040-0.065 (0.0015-0.0025)
Piston Pin Diameter, mm (in) ............... 25.000-25.006 (0.9842-0.9844)
Piston Pin to Piston Pin Bore Clearance, mm (in) ............... 25.010-25.018 (0.9846-0.9849)
Top Ring Groove Clearance, mm (in) ............... 0.12 (0.0047)
Second Ring Groove Clearance, mm (in) ............... 0.10 (0.0039)
Oil Ring Groove Clearance, mm (in) ............... 0.08 (0.0031)
Top Ring End Gap, mm (in) ............... 0.25-0.40 (0.0098-0.0157)
Second Ring End Gap, mm (in) ............... 0.30-0.45 (0.0118-0.0177)
Oil Ring End Gap, mm (in) ............... 0.20-0.40 (0.0078-0.0157)
Cylinder Head Surface Flatness, mm (in) ............... 0.03 (0.0011)
Inlet Valve Guide Bore Diameter, mm (in) ............... 7.000-7.015 (0.2755-0.2761)
Exhaust Valve Guide Bore Diameter, mm (in) ............... 7.000-7.015 (0.2755-0.2761)
Inlet Valve Stem Diameter, mm (in) ............... 6.965-6.980 (0.2742-0.2748)
Exhaust Valve Stem Diameter, mm (in) ............... 6.950-6.965 (0.2736-0.2742)
Inlet Valve Seat Angle, degrees ............... 45
Exhaust Valve Seat Angle, degrees ............... 45
Inlet Valve Stem to Guide Clearance, mm (in) ............... 0.10 (0.0039)
Exhaust Valve Stem to Guide Clearance, mm (in) ............... 0.12 (0.0047)
Inlet Valve Seating Width, mm (in) ............... 2.2 (0.0866)
Exhaust Valve Seating Width, mm (in) ............... 2.5 (0.0984)
Valve Spring Free Length, mm (in) ............... 42.5 (1.673)
Camshaft Journal Diameter, mm (in) ............... 20.000-20.015 (0.7874-0.7879)
Camshaft End Play, mm (in) ............... 0.10-0.25 (0.0039-0.0098)
Cam Lobe Height (Inlet), mm (in) ............... 33.45 (1.3169)
Cam Lobe Height (Exhaust), mm (in) ............... 33.45 (1.3169)

Tightening Torques

Cylinder Head Screws, Nm (lb-ft) ............... 40-42 (29.5-31.0)
Connecting Rod Cap Bolts, Nm (lb-ft) ............... 40-42 (29.5-31.0)
Flywheel Retention Nut Screw, Nm (lb-ft) ............... 115-125 (84.8-92.2)
Crankcase Main Tie Bolt Screws, Nm (lb-ft) ............... 33-37 (24.3-27.3)
Crankcase Breather Housing Cover Screws, Nm (lb-ft) ............... 8.5-9.5 (6.2-7.0)
Oil Sump Drain Plug Screw, Nm (lb-ft) ............... 50 (36.8)
Oil Pump Assembly Retention Screws, Nm (lb-ft) ............... 11-13 (8.1-9.5)
Cylinder Head Valve Cover Nut Fastener, Nm (lb-ft) ............... 10-12 (7.3-8.8)
Rocker Arm Shaft Support Bracket Bolt, Nm (lb-ft) ............... 24-26 (17.7-19.1)
Fuel Injection Pump Flange Nuts, Nm (lb-ft) ............... 23-25 (16.9-18.4)
Fuel Injection Nozzle Clamp Bracket Bolt, Nm (lb-ft) ............... 12-14 (8.8-10.3)
Fuel High Pressure Line Union Nuts, Nm (lb-ft) ............... 25-28 (18.4-20.6)
Fuel Tank Base Mounting Foot Bolt, Nm (lb-ft) ............... 22-24 (16.2-17.7)
Exhaust Silencer Muffler Nuts, Nm (lb-ft) ............... 23-25 (16.9-18.4)
Air Filter Housing Support Fasteners, Nm (lb-ft) ............... 9.0-11.0 (6.6-8.1)
Timing Cover Perimeter Fasteners, Nm (lb-ft) ............... 11-13 (8.1-9.5)
Governor Weight Assembly Screw, Nm (lb-ft) ............... 22-24 (16.2-17.7)
Starter Motor Mounting Hex Flange Bolts, Nm (lb-ft) ............... 43-47 (31.7-34.6)
Alternator Stator Plate Support Screws, Nm (lb-ft) ............... 4.5-5.5 (3.3-4.0)
Voltage Regulator Rectifier Outer Screw, Nm (lb-ft) ............... 8.5-9.5 (6.2-7.0)
Decompression Lever Shaft Clamping Bolt, Nm (lb-ft) ............... 9.0-11.0 (6.6-8.1)
Oil Pressure Switch Sensor Unit, Nm (lb-ft) ............... 12-14 (8.8-10.3)
Oil Filter Assembly Stud Mount, Nm (lb-ft) ............... 20-22 (14.7-16.2)
Crankcase Outer Access Inspection Plug, Nm (lb-ft) ............... 40-45 (29.5-33.1)
Governor Control Speed Lever Pivot Nut, Nm (lb-ft) ............... 14-16 (10.3-11.8)
Recoil Starter Housing Outer Screws, Nm (lb-ft) ............... 8.5-9.5 (6.2-7.0)
Cooling Air Shroud Sheet Metal Screws, Nm (lb-ft) ............... 5.0-6.0 (3.6-4.4)
Fuel Filter Bracket Structural Support Bolt, Nm (lb-ft) ............... 22-24 (16.2-17.7)
Fuel Tank Drain Plug Sealing Screw, Nm (lb-ft) ............... 18-22 (13.2-16.2)
Main Foundation Structural Mount Bolts, Nm (lb-ft) ............... 60-65 (44.2-47.9)
Auxiliary Power Take Off Pulley Screws, Nm (lb-ft) ............... 33-37 (24.3-27.3)
Camshaft Thrust Washers Fixing Screw, Nm (lb-ft) ............... 11-13 (8.1-9.5)
Oil Screen Cleaning Cover Sump Screws, Nm (lb-ft) ............... 11-13 (8.1-9.5)
Exhaust Shield Heat Guard Plate Screws, Nm (lb-ft) ............... 5.0-6.0 (3.6-4.4)
Lifting Eye Bracket Structural Anchor Bolt, Nm (lb-ft) ............... 24-26 (17.7-19.1)

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• Hatz Engines Specs
  
• Hatz 1B20 Specs
  
• Hatz 1B20-6 Specs
  
• Hatz 1B30 Specs
  
• Hatz 1B30E Specs
  
• Hatz 1B50 Specs
  
• Hatz 1B50E Specs
  

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