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Hatz 1B30 Engine

The Hatz 1B30 is an industrial-grade, single-cylinder, vertical four-stroke diesel engine engineered by Motorenfabrik Hatz. Part of the high-performance B-series, it is built with a lightweight die-cast alloy crankcase and an alloy cylinder head. The engine features a horizontal output shaft, a forged crankshaft, and a counter-balancing system. It is widely deployed across demanding construction, agricultural, and mobile power generation systems due to its robust, compact design and long service life.

Valve Configuration: Overhead Valve (OHV) configuration featuring a single camshaft operating pushrods and rocker arms. Valve Clearance Adjustment (Tappet): Standard operational clearance setting must be performed at an ambient temperature range of 10C to 30C. Cylinder Bore Diameter: 80.0 mm (3.15 in). Piston Stroke Length: 69.0 mm (2.72 in). Total Engine Displacement: 347 cc (21.18 cubic inches). Standard Compression Ratio: Rated at 21.5:1.

Fuel System: Mechanical direct injection directly into the combustion chamber via a high-pressure injection pump and nozzle line setup. Fuel Delivery and Filtration: Gravity or lift-pump fed from an integrated 5.0-liter sheet metal or polymer fuel tank. The assembly utilizes a replaceable inline fuel filter combined with a low-point water separator mechanism to prevent fuel contamination.

Lubrication System: Forced-spray, fully pressurized lubrication loop supplied via an internal oil pump. Filtration: Employs a full-flow, replaceable fine oil mesh filter element. Oil Specifications: ACEA B3/E4 or API CF/CH-4 for standard blocks. Cooling System: Forced-air configuration. Component Design: An integrated cooling air fan pulls air through a dedicated intake opening. The air is directed across the external cooling fins of the light-alloy cylinder and cylinder head through an optimized shroud assembly to safely dissipate thermal energy.

General Technical Data

Engine Specifications

Engine Model ............... Hatz 1B30
Engine Series ............... B-Series Industrial Engines
Engine Type ............... 4-stroke single-cylinder diesel engine
Number of Cylinders ............... 1
Cylinder Arrangement ............... Vertical column with horizontal or vertical shaft options
Engine Bore, in (mm) ............... 3.15 (80.0)
Engine Stroke, in (mm) ............... 2.72 (69.0)
Displacement, cu.in (cc) ............... 21.18 (347)
Rated Engine Power, hp (kW) ............... 3.1-7.2 (2.3-5.0)
Maximum Output, hp (kW) ............... 7.3 (5.4) at 3600 rpm
Minimum Output, hp (kW) ............... 2.8 (2.1) at 1500 rpm
Rated Engine Speed, rpm ............... 1500-3600
Peak Torque, lb-ft (Nm) ............... 12.92 (17.5) at 2300 rpm
Governor Maximum Speed, rpm ............... 3600
Idle Speed, rpm ............... 800-1000
Aspiration Type ............... Naturally Aspirated
Cooling System ............... Axial blower air cooling via flywheel fan
Combustion System ............... Direct injection with multi-hole nozzle
Compression Ratio ............... 21.5:1
Direction of Rotation ............... Counter-clockwise looking at flywheel side
Cylinder Block Material ............... High-strength die-cast aluminum alloy
Cylinder Crankcase Type ............... Integrated open-deck design with cast iron liner
Cylinder Head Material ............... Cast aluminum alloy with cross-flow porting
Valves per Cylinder ............... 2 (1 intake valve and 1 exhaust valve)
Valve Arrangement ............... Overhead valves (OHV) operated by pushrods
Camshaft Drive ............... Gear-driven from crankshaft gear wheels
Lubrication System ............... Full-pressure lubrication with gear pump
Oil Pump Type ............... Forced-feed gear wheel pump assembly
Oil Filtration System ............... Cleanable mesh screen oil strainer element
Air Cleaner Type ............... Dry dual-element or cyclonic heavy duty pack
Decompression System ............... Automatic mechanical decompression mechanism
Starting System ............... Mechanical recoil starter or electric motor
Electrical System, V ............... 12
Alternator Output, A ............... 14

Fuel System

Fuel Injection System ............... Direct mechanical injection pump unit
Injection Pump Type ............... Integrated high-pressure single plunger pump
Injection Plunger Diameter, in (mm) ............... 0.236 (6.0)
Injection Plunger Stroke, in (mm) ............... 0.197 (5.0)
Injection Nozzle Type ............... Multi-hole micro-orifice nozzle unit
Nozzle Opening Pressure, psi (bar) ............... 3625-3770 (250-260)
Fuel Supply Feed ............... Gravity feed with primary tank strainer
Standard Fuel Tank Capacity, gal (L) ............... 1.32 (5.0)
Optional Small Fuel Tank Capacity, gal (L) ............... 0.79 (3.0)
Fuel Specification ............... EN 590, BS 2869 A1/A2, ASTM D 975
Fuel Filter Type ............... Spin-on fine particulate cartridge filter
Fuel Return Line System ............... External low-pressure overflow circuit to tank
Injection Timing Advance, deg BTDC ............... 11-13
Governor System Type ............... Mechanical centrifugal flyweight governor
Bleeding Method ............... Self-bleeding low-pressure fuel loop system

Dimensions and Weight

Overall Length, in (mm) ............... 13.0 (330)
Overall Width, in (mm) ............... 14.6 (370)
Overall Height, in (mm) ............... 16.9 (430)
Dry Weight with Recoil Start, lbs (kg) ............... 78 (35)
Dry Weight with Electric Start, lbs (kg) ............... 88 (40)
Dry Weight with HD Alternator, lbs (kg) ............... 91 (41)

Maintenance Data

Service Information

Compression Pressure (Nominal), psi (bar) ............... 435-507 (30.0-35.0)
Compression Pressure (Minimum), psi (bar) ............... 348 (24.0)
Oil Pressure at Idle Speed, psi (bar) ............... 8.7 (0.6)
Oil Pressure at Rated Speed, psi (bar) ............... 36.2-58.0 (2.5-4.0)
Oil Temperature Maximum, F (C) ............... 284 (140)
Intake Valve Clearance, Cold, in (mm) ............... 0.0039 (0.10)
Exhaust Valve Clearance, Cold, in (mm) ............... 0.0039 (0.10)

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 Sump Capacity (Minimum), qt (L) ............... 0.95 (0.9)
Engine Oil Sump Capacity (Maximum), qt (L) ............... 1.16 (1.1)

Service Intervals

Change engine oil ............... Every 250 hours
Clean oil filter ............... Every 1000 hours
Replace air cleaner ............... 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, in (mm) ............... 3.1496-3.1504 (80.000-80.020)
Cylinder Bore Wear Maximum Limit, in (mm) ............... 3.1535 (80.100)
Cylinder Bore Out-of-Round Max, in (mm) ............... 0.0011 (0.030)
Connecting Rod Small End Bushing I.D, in (mm) ............... 0.8665-0.8669 (22.010-22.020)
Crankshaft Main Journal Diameter, in (mm) ............... 1.7712-1.7718 (44.988-45.002)
Crankpin Journal Diameter, in (mm) ............... 1.5743-1.5749 (39.988-40.000)
Connecting Rod Big End Bearing Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.070)
Crankshaft Axial End Play, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Piston Skirt Outer Diameter, in (mm) ............... 3.1472-3.1480 (79.940-79.960)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0015-0.0031 (0.040-0.080)
Piston Pin to Small End Bushing Clearance, in (mm) ............... 0.0003-0.0010 (0.010-0.026)
Piston Pin Bore Outer Diameter, in (mm) ............... 0.8661-0.8664 (22.000-22.006)
Piston Pin Outer Diameter, in (mm) ............... 0.8659-0.8661 (21.994-22.000)
Top Ring Groove Width, in (mm) ............... 0.0602-0.0610 (1.530-1.550)
Second Ring Groove Width, in (mm) ............... 0.0602-0.0610 (1.530-1.550)
Oil Ring Groove Width, in (mm) ............... 0.1193-0.1201 (3.030-3.050)
Top Ring Side Clearance, in (mm) ............... 0.0019-0.0035 (0.050-0.090)
Second Ring Side Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.070)
Top Ring End Gap, in (mm) ............... 0.0098-0.0157 (0.250-0.400)
Second Ring End Gap, in (mm) ............... 0.0118-0.0177 (0.300-0.450)
Oil Ring End Gap, in (mm) ............... 0.0098-0.0177 (0.250-0.450)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.2354-0.2360 (5.980-5.995)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.2346-0.2352 (5.960-5.975)
Valve Guide Inside Diameter, in (mm) ............... 0.2362-0.2370 (6.000-6.020)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0002-0.0015 (0.005-0.040)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0009-0.0023 (0.025-0.060)
Valve Seat Angle, degrees ............... 45
Valve Face Angle, degrees ............... 45
Valve Sink Depth, in (mm) ............... 0.0275-0.0354 (0.700-0.900)
Valve Spring Free Length, in (mm) ............... 1.4173 (36.000)
Camshaft Journal Diameter, in (mm) ............... 0.7871-0.7877 (19.993-20.008)
Camshaft Bearing Bore Diameter, in (mm) ............... 0.7881-0.7893 (20.020-20.050)
Cam Lobes Height (Intake), in (mm) ............... 1.2992-1.3031 (33.000-33.100)
Cam Lobes Height (Exhaust), in (mm) ............... 1.2992-1.3031 (33.000-33.100)

Tightening Torques

Cylinder Head Nuts, lb-ft (Nm) ............... 21.4-22.9 (29.0-31.0)
Connecting Rod Big End Cap Bolts, lb-ft (Nm) ............... 23.6-25.8 (32.0-35.0)
Flywheel Central Nut, lb-ft (Nm) ............... 59.0-62.7 (80.0-85.0)
Crankcase Main Cover Bolts (M8), lb-ft (Nm) ............... 16.2-18.4 (22.0-25.0)
Crankcase Main Cover Bolts (M6), lb-ft (Nm) ............... 7.3-8.8 (10.0-12.0)
Engine Oil Drain Sump Plug, lb-ft (Nm) ............... 36.9 (50.0)
Rocker Arm Shaft Support Bracket Bolt, lb-ft (Nm) ............... 8.8-10.3 (12.0-14.0)
Cylinder Head Valve Cover Nuts, lb-ft (Nm) ............... 6.6-8.1 (9.0-11.0)
Injection Pump Flange Mounting Nuts, lb-ft (Nm) ............... 16.2-18.4 (22.0-25.0)
Injection Nozzle Clamp Holder Bolt, lb-ft (Nm) ............... 11.0-12.5 (15.0-17.0)
Fuel High Pressure Line Union Nuts, lb-ft (Nm) ............... 18.4-22.1 (25.0-30.0)
Fuel Tank Base Mounting Support Brackets, lb-ft (Nm) ............... 16.2-18.4 (22.0-25.0)
Exhaust Manifold Retention Nuts, lb-ft (Nm) ............... 16.2-18.4 (22.0-25.0)
Intake Manifold Flange Screws, lb-ft (Nm) ............... 7.3-8.8 (10.0-12.0)
Starter Motor Flange Mounting Bolts, lb-ft (Nm) ............... 33.2-36.9 (45.0-50.0)
Voltage Regulator Module Screws, lb-ft (Nm) ............... 2.9-4.4 (4.0-6.0)
Air Blower Cooling Fan Housing Screws, lb-ft (Nm) ............... 5.9-7.3 (8.0-10.0)
Governor Housing Cover Fasteners, lb-ft (Nm) ............... 7.3-8.8 (10.0-12.0)
Decompression Control Shaft Lever Bolt, lb-ft (Nm) ............... 5.9-7.3 (8.0-10.0)
Speed Control Lever Friction Adjustment Nut, lb-ft (Nm) ............... 8.8-11.0 (12.0-15.0)
Oil Pressure Sensor Indicator Switch Unit, lb-ft (Nm) ............... 10.3-12.5 (14.0-17.0)
Breather Valve Cover Plate Screws, lb-ft (Nm) ............... 2.9-4.4 (4.0-6.0)
Air Filter Housing Main Mount Nut, lb-ft (Nm) ............... 5.9-7.3 (8.0-10.0)
Recoil Starter Assembly Mounting Bolts, lb-ft (Nm) ............... 5.9-7.3 (8.0-10.0)
Crankshaft Timing Gear Wheel Screw, lb-ft (Nm) ............... 33.2-36.9 (45.0-50.0)
Camshaft Thrust Washers Mounting Screws, lb-ft (Nm) ............... 7.3-8.8 (10.0-12.0)
Flywheel Housing Ring Gear Screws, lb-ft (Nm) ............... 16.2-18.4 (22.0-25.0)
Rigid Foundation Base Fasteners, lb-ft (Nm) ............... 29.5-33.2 (40.0-45.0)

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• Hatz Engines Specs
  
• Hatz 1B20 Specs
  
• Hatz 1B20-6 Specs
  
• Hatz 1B30E Specs
  
• Hatz 1B40 Specs
  
• Hatz 1B50 Specs
  
• Hatz 1B50E Specs
  

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