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Continental G193 Engine

The Continental G193 is an industrial-grade, heavy-duty 4-cylinder internal combustion engine developed by the Continental Motors Company. Designed primarily for forklifts, agricultural tractors, and static industrial power units, it features a rugged, sleeveless cylinder block design in its early iterations. Built for durability, this overhead-valve engine minimizes thermal deformation under continuous load conditions. Its narrow frontal profile allows for optimal accessory packaging, making it highly serviceable in tight engine bays.

The engine employs an overhead valve (OHV) design featuring an in-head pushrod-and-rocker system. It uses individual porting for optimal gas flow efficiency. Dual valve springs with single-groove taper-lock keepers control the valve assemblies. Bore: 3.75 inches (95.25 mm). Stroke: 4.37 inches (111.12 mm).

The fuel architecture supports multiple fuel types, including gasoline, liquefied petroleum gas (LPG), and natural gas. Fuel delivery is handled either through a gravity-feed system or via a mechanical or electric fuel pump. Fuel vaporization occurs through high-efficiency CK or Zenith carburetors equipped with fixed high-speed jets and adjustable idle needles. Engine speed stability is enforced by a centrifugal cam-gear governor, constant/variable speed governor, or a Hoof velocity-type governor assembly.

Lubrication is managed via a full-pressure delivery system pressurized by a positive-displacement Gerotor internal gear pump. The crankcase configuration utilizes an oil pan gasket sealing system, and the circuit functions safely across environmental extremes ranging from -30C up to 38C using matched SAE viscosity oil grades.

Cooling System: Engine temperature is maintained using a force-circulated liquid cooling network powered by a belt-driven water pump. The system features cast surrounding water jackets encircling the combustion zones. Coolant circulation is regulated by a mechanical thermostat that begins opening at 81C (178F) and reaches its full open state at 94C (201F). System pressure is contained by a radiator pressure cap rated between 0.3 to 1.0 Bar.

General Technical Data

Engine Specifications

Engine Model ............... Continental G193
Engine Series ............... G-Series Industrial
Engine Configuration ............... 4-Cycle Inline 4-Cylinder
Valve Configuration ............... Overhead Valve (OHV)
Fuel Type Capability ............... Gasoline / Liquid Propane Gas (LPG)
Bore Diameter, in (mm) ............... 3.750 (95.250)
Stroke Length, in (mm) ............... 4.375 (111.125)
Total Displacement, cu.in (L) ............... 193.00 (3.16)
Power Rating Maximum, hp (kW) ............... 58.0 (43.3) at 2400 rpm
Net Power Output, hp (kW) ............... 46.0 (34.3) at 1800 rpm
Peak Torque Output, lb-ft (Nm) ............... 142.00 (192.52) at 1200 rpm
Compression Ratio ............... 7.1:1
Max Governed Speed, rpm ............... 2200-2400
Idle Speed Range, rpm ............... 450-550
Firing Order Sequence ............... 1-3-4-2
Cylinder Number One Position ............... Front Flywheel Opposite
Direction of Crankshaft Rotation ............... Clockwise facing front belt pulley
Cylinder Block Architecture ............... Deep-skirt cast iron monoblock
Cylinder Head Design ............... Single-piece cast iron crossflow cross-bolted
Number of Main Bearings ............... 3
Lubrication System ............... Full pressure
Oil Pump Type ............... Internal gear-driven from camshaft
Oil Filter Assembly Type ............... Full-flow spin-on disposable
Cooling System ............... Forced liquid circulation
Water Pump Type ............... Front mounted belt-driven centrifugal
Cooling Fan Drive Ratio ............... 1.15:1
Air Cleaner Type ............... Multi-stage oil bath
Starting System ............... Electric starter
Electrical System ............... 12V negative ground

Fuel System

Carburetor Manufacturer ............... Zenith or Marvel-Schebler
Carburetor Type ............... Updraft single-barrel mechanical choke
LPG Regulator Manufacturer ............... Impco
LPG Converter Model ............... Model J or Model Cobra
LPG Carburetor Mixer Model ............... CA100 or CA55
Fuel Pump Mechanical Type ............... Diaphragm gear-driven from camshaft
Fuel Pump Operating Pressure, psi (bar) ............... 3.50-5.00 (0.24-0.34)
Fuel Filter Element Type ............... Primary sediment bowl with spin-on paper element
Governor System Manufacturer ............... Hoof or Pierce mechanical flyweight
Air Cleaner Consumption Rating, cfm (m3/min) ............... 115.00 (3.25)
Main Jet Orifice Diameter, in (mm) ............... 0.052 (1.32)
Idle Jet Orifice Diameter, in (mm) ............... 0.028 (0.71)
Float Setting Height Standard, in (mm) ............... 0.281 (7.14)

Dimensions and Weight

Overall Length, in (mm) ............... 28.4 (722)
Overall Width, in (mm) ............... 19.2 (485)
Overall Height, in (mm) ............... 29.6 (750)
Dry Weight, lbs (kg) ............... 410 (186)
Operating Weight, lbs (kg) ............... 445 (202)
Shipping Gross Weight, lb (kg) ............... 515 (233)

Maintenance Data

Service Information

Compression Pressure, Minimum, psi (bar) ............... 120.00 (8.27)
Compression Variance Limit Max, psi (bar) ............... 10.00 (0.69)
Oil Pressure at Rated Speed, psi (bar) ............... 30.00-45.00 (2.06-3.10)
Oil Pressure at Low Idle, psi (bar) ............... 12.00 (0.82)
Thermostat Opening Temperature, F (C) ............... 160.00 (71.11)
Thermostat Fully Open Temperature, F (C) ............... 185.00 (85.00)
Spark Plug Reach Length, in (mm) ............... 0.437 (11.10)
Spark Plug Gap, Standard, in (mm) ............... 0.025 (0.635)
Distributor Breaker Point Gap, in (mm) ............... 0.020 (0.508)
Ignition Timing Static Advance, deg BTDC ............... 4.00
Ignition Timing Centrifugal Advance, deg BTDC ............... 24.00
Intake Valve Clearance, Cold, in (mm) ............... 0.014 (0.356)
Exhaust Valve Clearance, Cold, in (mm) ............... 0.014 (0.356)

Engine Oil and Coolant

Engine Oil Type ............... SAE 30, SAE 10W-40, 10W-30
API Service Classifications ................. SF, SG
Engine Oil Capacity, Base Pan, qt (L) ............... 5.00 (4.73)
Engine Oil Capacity with Filter, qt (L) ............... 6.00 (5.67)
Cooling System Capacity, qt (L) ............... 11.50 (10.88)

Service Intervals

Change oil and filter ............... Every 100 hours
Replace/clean fuel filters ............... Every 250 hours
Inspect air cleaner ............... Every 50 hours
Change air filter ............... Every 150 hours
Change coolant ............... Every 1000 hours
Valve-lash adjustment ............... Every 500 hours
Distributor point inspection ............... Every 300 hours
Spark plug replacement ............... Every 500 hours
Compression test evaluation ............... Every 500 hours
Belt tension verification ............... Every 300 hours
Check ignition timing ............... Every 500 hours

Service Specifications

Cylinder Bore Out-of-Round, in (mm) ............... 0.0010 (0.0254)
Cylinder Bore Taper, Wear Limit, in (mm) ............... 0.0020 (0.0508)
Crankshaft Main Journal Outer Diameter, in (mm) ............... 2.3740-2.3750 (60.300-60.325)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0015-0.0035 (0.0381-0.0889)
Crankshaft End Play, in (mm) ............... 0.0030-0.0070 (0.0762-0.1778)
Crankshaft Thrust Journal Width, in (mm) ............... 1.3520 (34.341)
Main Bearing Journal Runout, Limit, in (mm) ............... 0.0010 (0.0254)
Connecting Rod Journal Outer Diameter, in (mm) ............... 2.2490-2.2500 (57.125-57.150)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0012-0.0031 (0.0305-0.0787)
Connecting Rod Center-to-Center Length, in (mm) ............... 7.3750 (187.325)
Connecting Rod Big End Bore I.D, in (mm) ............... 2.3745-2.3755 (60.312-60.338)
Connecting Rod Bushing Small End Bore I.D, in (mm) ............... 0.9905-0.9910 (25.159-25.171)
Piston Pin Diameter, in (mm) ............... 0.9900 (25.146)
Piston Pin Diameter (Early Model), in (mm) ............... 1.1090 (28.169)
Piston Outer Diameter at Skirt base, in (mm) ............... 3.7475-3.7485 (95.186-95.212)
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0020-0.0030 (0.0508-0.0762)
Top Ring Groove Width, in (mm) ............... 0.0795 (2.019)
Second Ring Groove Width, in (mm) ............... 0.0950 (2.413)
Oil Ring Groove Width, in (mm) ............... 0.1890 (4.801)
Top Ring Side Clearance, in (mm) ............... 0.0020-0.0040 (0.0508-0.1016)
Second Ring Side Clearance, in (mm) ............... 0.0015-0.0035 (0.0381-0.0889)
Oil Ring Side Clearance Limit, in (mm) ............... 0.0015-0.0035 (0.0381-0.0889)
Top Ring End Gap, in (mm) ............... 0.0100-0.0200 (0.2540-0.5080)
Second Ring End Gap, in (mm) ............... 0.0100-0.0200 (0.2540-0.5080)
Oil Ring End Gap, in (mm) ............... 0.0100-0.0200 (0.2540-0.5080)
Intake Valve Head Outer Diameter, in (mm) ............... 1.6400 (41.656)
Exhaust Valve Head Outer Diameter, in (mm) ............... 1.3750 (34.925)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.3410-0.3420 (8.661-8.687)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.3400-0.3410 (8.636-8.661)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0015-0.0035 (0.0381-0.0889)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0025-0.0045 (0.0635-0.1143)
Valve Guide Inner Bore Diameter, in (mm) ............... 0.3435-0.3445 (8.725-8.750)
Valve Springs Free Length, in (mm) ............... 2.1200 (53.848)
Valve Seat Face Angle, deg ............... 45
Camshaft Journal O.D (Number One), in (mm) ............... 1.9960-1.9970 (50.698-50.724)
Camshaft Journal O.D (Number Two), in (mm) ............... 1.9335-1.9345 (49.111-49.136)
Camshaft Journal O.D (Number Three), in (mm) ............... 1.8710-1.8720 (47.523-47.549)
Camshaft Bearing Running Clearance, in (mm) ............... 0.0015-0.0035 (0.0381-0.0889)
Camshaft End Play, in (mm) ............... 0.0030-0.0060 (0.0762-0.1524)
Cam Lobe Lift (Intake), in (mm) ............... 0.3120 (7.925)
Cam Lobe Lift (Exhaust), in (mm) ............... 0.3120 (7.925)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.7490-0.7500 (19.025-19.050)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.7510-0.7520 (19.075-19.101)
Tappet Lifter Body Outer Diameter, in (mm) ............... 0.6855-0.6865 (17.412-17.437)
Tappet Lifter Guide Bore Inner Diameter, in (mm) ............... 0.6875-0.6885 (17.463-17.488)

Tightening Torques

Cylinder Head Cap Screws, lb-ft (Nm) ............... 100.00 (135.58)
Connecting Rod Bearing Cap Nuts, lb-ft (Nm) ............... 75.00 (101.69)
Crankshaft Main Bearing Cap Screws, lb-ft (Nm) ............... 105.00 (142.36)
Flywheel Mounting Attachment Cap Screws, lb-ft (Nm) ............... 65.00 (88.13)
Flywheel Housing to Block Interface Fasteners, lb-ft (Nm) ............... 45.00 (61.01)
Camshaft Thrust Plate Mounting Screws, lb-ft (Nm) ............... 25.00 (33.90)
Camshaft Driven Timing Gear Lock Bolt, lb-ft (Nm) ............... 80.00 (108.47)
Crankshaft Vibration Damper Belt Hub Bolt, lb-ft (Nm) ............... 140.00 (189.81)
Rocker Arm Shaft Support Retaining Nut, lb-ft (Nm) ............... 35.00 (47.45)
Valve Rocker Arm Valve Cover Nuts, lb-ft (Nm) ............... 10.00 (13.56)
Intake Manifold to Cylinder Head Port Studs, lb-ft (Nm) ............... 25.00 (33.90)
Exhaust Manifold to Cylinder Head Port Studs, lb-ft (Nm) ............... 25.00 (33.90)
Oil Pan Drain Plug, lb-ft (Nm) ............... 35.00 (47.45)
Oil Pan Lower Housing Bolts, lb-ft (Nm) ............... 18.00 (24.40)
Oil Pump Assembly Mounting Fasteners, lb-ft (Nm) ............... 22.00 (29.83)
Water Pump Outer Mounting Frame Fasteners, lb-ft (Nm) ............... 25.00 (33.90)
Spark Plug, lb-ft (Nm) ............... 28.00 (37.96)
Starter Motor Housing Side Face Mount Bolts, lb-ft (Nm) ............... 45.00 (61.01)
Generator Alternator Frame Adjusting Studs, lb-ft (Nm) ............... 20.00 (27.12)

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