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Wisconsin AGND Engine

The Wisconsin AGND is a heavy-duty, single-cylinder, four-cycle, air-cooled industrial gasoline engine designed for demanding industrial, agricultural, and construction applications. Built by the Wisconsin Motor Corporation, this model is recognized as one of the highest-horsepower single-cylinder engines produced by the manufacturer, matching rugged cast-iron construction with compact dimensions. It directly replaces the earlier Model AGN, integrating valve-train upgrades to handle continuous, high-load operations up to a maximum governed speed of 3200 RPM.

The AGND utilizes an L-head (side-valve) layout driven by a mechanical camshaft. To withstand sustained high-temperature operations, the exhaust side is heavily reinforced compared to base models. It is equipped with a premium Stellite exhaust valve, a hardened Stellite valve seat insert, and a mechanical exhaust valve rotator that continuously spins the valve to ensure uniform wear and prevent carbon buildup. Cylinder Bore: 3.50 inches. Piston Stroke: 4.00 inches.

The fuel architecture consists of a gravity-fed or mechanical fuel pump configuration passing through an inline gasoline strainer. Combustion mixtures are regulated via a single-barrel, balanced carburetor: typically a Zenith or a Marvel-Schebler (Models L-64 or L-64-A). Throttle Management: A mechanical flyweight governor is linked directly via control rods to the carburetor throttle fly to dynamically maintain set operating speeds under varying load demands. Choke System: Uses a manual choke lever or dash-mounted button to close the choker fly for rich-mixture cold starts. Base Calibration: For the common Marvel-Schebler L-64-A variant, the low-speed idle needle is set at 1.25 turns off its seat, and the high-speed main jet needle is set at 1-5/8 turns off its seat.

Lubrication is managed via a mechanical, positive-displacement plunger-type oil pump assembly submerged in the crankcase oil sump. The pump delivers targeted oil streams to internal components while an integrated splash mechanism bathes the cylinder wall, wrist pin, and camshaft gears. This engine relies on a forced-air heavy-duty cooling system. A combination fan-flywheel draws ambient air and forces it through a fitted sheet-metal shroud. Stamped steel air ducts and baffle plates direct this high-velocity airflow uniformly around the heavily finned cast-iron cylinder block and aluminum cylinder head.

General Technical Data

Engine Specifications

Engine Model ............... Wisconsin AGND
Engine Type ............... 4-cycle single-cylinder air-cooled heavy-duty gasoline
Number of Cylinders ............... 1
Engine Bore, in (mm) ............... 3.50 (88.9)
Engine Stroke, in (mm) ............... 4.00 (101.6)
Displacement, cu.in (L) ............... 38.5 (0.63)
Rated Engine Power, hp (kW) ............... 12.5 (9.3) at 3200 rpm
Rated Engine Speed, rpm ............... 1600-3200
Peak Torque ............... 36.6 Nm (27.0 lb-ft) at 1900 rpm
Idle Speed ............... 1000-1200 rpm
Operating Speed ............... 2200-3200 rpm
Compression Ratio ............... 5.1:1-5.5:1
Rotation Direction ............... Counter-clockwise facing PTO shaft configuration
Valves per Cylinder ............... 2 L-head layout side valves
Exhaust Valve Material ............... Stellite alloy face facing element
Exhaust Valve Rotator ............... Positive mechanical rotator mechanism fitted
Crankshaft Material ............... Forged steel alloy counterweighted structure
Main Bearing Type ............... Tapered roller bearings on dual journals
Cylinder Block Type ............... Cast iron integrated crankcase
Cylinder Head Type ............... Aluminum alloy detachable structural config
Lubrication System ............... Constant-level splash oil mechanism
Oil Pump Type ............... Camshaft-driven plunger positive displacement pump
Oil Filter Type ............... External optional bypass screen mechanism
Cooling System ............... Forced air stream via integrated flywheel fan
Air Cleaner Type ............... Heavy-duty oil bath filtration mechanism
Starting System ............... Hand crank mechanism or optional 12V electric starter
Electrical System ............... 12V operational config or self-contained magneto circuit

Fuel System

Carburetor Model ............... Marvel-Schebler L-64 or L-64A variant layout
Carburetor Type ............... Updraft single throat induction configuration
Idle Needle Adjustment, L-64 ............... 0.875 turn off internal mechanical seating surface
Idle Needle Tolerance, L-64 ............... 0.063 turn variation range allowable
Idle Needle Adjustment, L-64A ............... 1.250 turns off internal mechanical seating surface
Idle Needle Tolerance, L-64A ............... 0.250 turn variation range allowable
High Speed Needle Adjustment ............... 1.625 turns open from seating position
High Speed Needle Tolerance ............... 0.250 turn variation range allowable
Governor Type ............... Mechanical centrifugal flyweight configuration
Carburetor Float Level, in (mm) ............... 0.375 (9.5)
Fuel Delivery Method ............... Gravity feed tank or mechanical camshaft actuated diaphragm pump
Fuel Tank Capacity, gal (L) ............... 1.00-3.50 (3.8-13.2)
Fuel Recommendation ............... Regular unleaded gasoline fuel medium
Fuel Strainer Type ............... Sediment bowl with fine wire mesh element screen
Choke Control ............... Manual cable remote assembly linked directly to throttle bracket
Main Jet Specification ............... Fixed orifice standard metering component
Air Intake Diameter, in (mm) ............... 1.25 (31.8)
Venturi Size Choice, in (mm) ............... 0.938 (23.8)
Fuel Pump Operating Pressure, psi (kPa) ............... 1.50-3.00 (10.3-20.7)

Dimensions and Weight

Overall Height, in (mm) ............... 25.5 (645)
Overall Width, in (mm) ............... 19.8 (500)
Overall Length, in (mm) ............... 21.3 (540)
Dry Weight, lbs (kg) ............... 210 (95)

Maintenance Data

Service Information

Spark Plug Type ............... Champion D-21
Spark Plug Gap, in (mm) ............... 0.030 (0.76)
Breaker Point Gap, in (mm) ............... 0.015 (0.38)
Distributor Point Gap, in (mm) ............... 0.020 (0.51)
Ignition Timing Advance ............... 20.0 deg BTDC
Intake Valve Clearance, Cold, in (mm) ............... 0.0080 (0.203)
Exhaust Valve Clearance, Cold, in (mm) ............... 0.0160 (0.406)

Engine Oil

Engine Oil Type .................. SAE 30, SAE 20W, or SAE 10W
API Service Classifications ......................... SE, SF, SG, or CC
Crankcase Oil Capacity, pt (L) ............... 2.50 (1.18)
Air Cleaner Oil Capacity, pt (L) ............... 0.50 (0.24)
Reduction Gear Oil Capacity, pt (L) ............... 0.75 (0.35)
Clutch Housing Lubricant Capacity, pt (L) ............... 0.50 (0.24)

Service Intervals

Change engine oil ............... Every 50 hours
Inspect air cleaner ............... Every 8 hours
Service air cleaner ............... Every 50 hours
Clean fuel strainer ............... Every 50 hours
Valve clearance adjustment ............... Every 150 hours
Fuel system inspection ............... Every 100 hours
Clean spark plug ............... Every 100 hours
Replace spark plug ............... Every 300 hours
Clean cooling fin ............... Every 50 hours
Flush/Clean fuel tank ............... Every 500 hours
Change reduction gear oil ............... Every 500 hours

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ............... 3.500-3.501 (88.900-88.913)
Cylinder Bore Out Of Round, in (mm) ............... 0.0030 (0.076)
Cylinder Bore Taper, in (mm) ............... 0.0040 (0.102)
Connecting Rod Journal Diameter, in (mm) ............... 2.2490-2.2500 (57.125-57.150)
Connecting Rod Radial Clearance, in (mm) ............... 0.0010-0.0025 (0.025-0.064)
Connecting Rod Side Clearance, in (mm) ............... 0.0050-0.0100 (0.127-0.254)
Connecting Rod Bushing Bore I.D, in (mm) ............... 0.8754-0.8757 (22.235-22.243)
Crankshaft Journal Out Of Round, in (mm) ............... 0.0010 (0.025)
Crankshaft Main Bearing Bore I.D, in (mm) ............... 3.1240-3.1250 (79.350-79.375)
Crankshaft End Play, in (mm) ............... 0.0020-0.0040 (0.051-0.102) cold set tolerance limit
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0045-0.0060 (0.114-0.152)
Piston Pin to Small End Bushing Clearance, in (mm) ............... 0.0004-0.0009 (0.010-0.023)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0002-0.0007 (0.005-0.018)
Piston Pin Bore Inside Diameter, in (mm) ............... 0.8752-0.8755 (22.230-22.238)
Piston Pin Diameter, in (mm) ............... 0.8748-0.8750 (22.220-22.225)
Top Ring Groove Side Clearance, in (mm) ............... 0.0020-0.0035 (0.051-0.089)
Second Ring Groove Side Clearance, in (mm) ............... 0.0015-0.0030 (0.038-0.076)
Third Ring Groove Side Clearance, in (mm) ............... 0.0015-0.0030 (0.038-0.076)
Oil Ring Groove Side Clearance, in (mm) ............... 0.0015-0.0030 (0.038-0.076)
Top Ring End Gap, in (mm) ............... 0.0120-0.0220 (0.305-0.559)
Second Ring End Gap, in (mm) ............... 0.0120-0.0220 (0.305-0.559)
Third Ring End Gap, in (mm) ............... 0.0120-0.0220 (0.305-0.559)
Oil Ring End Gap, in (mm) ............... 0.0100-0.0200 (0.254-0.508)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.3735-0.3740 (9.487-9.500)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.3720-0.3725 (9.449-9.462)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0020-0.0035 (0.051-0.089)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0035-0.0050 (0.089-0.127)
Valve Guide Inside Diameter, in (mm) ............... 0.3760-0.3770 (9.550-9.576)
Valve Seat Angle, degrees ............... 45.0
Valve Face Angle, degrees ............... 45.0
Valve Seat Bore Inside Diameter, in (mm) ............... 1.6270-1.6280 (41.326-41.351)
Valve Spring Free Length, in (mm) ............... 2.125 (53.98)
Camshaft Journal Clearance, in (mm) ............... 0.0015-0.0035 (0.038-0.089)
Camshaft End Play, in (mm) ............... 0.0020-0.0060 (0.051-0.152)
Oil Pump Plunger Clearance, in (mm) ............... 0.0015-0.0030 (0.038-0.076)
Governor Shaft Bushing Inside Diameter, in (mm) ............... 0.5010-0.5020 (12.725-12.751)
Governor Cross Shaft Clearance, in (mm) ............... 0.0010-0.0025 (0.025-0.064)
Magneto Drive Gear Backlash, in (mm) ............... 0.0020-0.0050 (0.051-0.127)
Camshaft Gear Backlash, in (mm) ............... 0.0020-0.0040 (0.051-0.102)

Tightening Torques

Cylinder Head Bolt, lb-ft (Nm) ............... 22.00-24.00 (29.8-32.5)
Connecting Rod Nut, lb-ft (Nm) ............... 22.00-24.00 (29.8-32.5)
Main Bearing Cap Screws, lb-ft (Nm) ............... 24.00-26.00 (32.5-35.3)
Spark Plug Body, lb-ft (Nm) ............... 28.00-30.00 (37.9-40.7)
Flywheel Retaining Center Nut, lb-ft (Nm) ............... 90.00-100.00 (122.0-135.6)
Crankcase Cover Bolts, lb-ft (Nm) ............... 14.00-18.00 (19.0-24.4)
Manifold Air Fuel Attachment Nuts, lb-ft (Nm) ............... 14.00-18.00 (19.0-24.4)
Governor Lever Adjustment Bolt, lb-ft (Nm) ............... 8.00-10.00 (10.8-13.6)
Magneto Housing Mounting Screws, lb-ft (Nm) ............... 14.00-18.00 (19.0-24.4)
Oil Pump Base Plugs Bolt, lb-ft (Nm) ............... 20.00-25.00 (27.1-33.9)
Valve Inspection Cover Screw, lb-ft (Nm) ............... 4.00-6.00 (5.4-8.1)
Air Shroud Panel Hardware, lb-ft (Nm) ............... 5.00-7.00 (6.8-9.5)
Oil Drain Hex Plug, lb-ft (Nm) ............... 25.00-30.00 (33.9-40.7)
Fuel Tank Mounting Bracket Straps, lb-ft (Nm) ............... 8.00-12.00 (10.8-16.3)
Clutch Backing Plate Assembly Studs, lb-ft (Nm) ............... 28.00-32.00 (37.9-43.4)
Reduction Housing Flange Fasteners, lb-ft (Nm) ............... 18.00-22.00 (24.4-29.8)
Breather Cap Assembly Fastener, lb-ft (Nm) ............... 3.00-5.00 (4.1-6.8)
Piston Pin Wire Lock Screws, lb-ft (Nm) ............... 10.00-12.00 (13.6-16.3)
Starter Motor Mounting Flange Screws, lb-ft (Nm) ............... 35.00-40.00 (47.5-54.2)
Ground Cable Battery Terminal Screw, lb-ft (Nm) ............... 15.00-20.00 (20.3-27.1)

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• Wisconsin Engines Specs
  
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• Wisconsin BKN Specs
  

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