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Briggs and Stratton 28N707 Engine
General Technical Data
Briggs and Stratton 28N707 Engine Specifications
Engine Model ............ Briggs and Stratton 28N707
Engine Type ............ 4-cycle single cylinder OHV vertical shaft air-cooled gasoline engine
Number of Cylinders ............ 1
Displacement, cu.in (cc) ............ 28.37 (465)
Cylinder Bore, in (mm) ............ 3.44 (87.0)
Piston Stroke, in (mm) ............ 3.06 (78.0)
Rated Engine Power, hp (kW) ............ 15.5 (11.5)
Rated Engine Speed, rpm ............ 3300
Idle Speed, rpm ............ 1200
Cylinder Bore Type ............ Cast iron sleeve
Lubrication System ............ Full pressure
Air Cleaner ............ Paper filter with a foam pre-cleaner
Cooling System ............ Forced air
Ignition System ............ Electronic
Starting System ............ Electric starter
Electrical System Rating, Volts ............ 12
Fuel System
Fuel System Type ............ Carburetor
Carburetor Type ............ Float
Fuel Pump ............ Pulse type
Governor Type ............ Mechanical
Fuel Type ............ Gasoline
Briggs and Stratton 28N707 Maintenance Data
Cylinder Block and Valves
Cylinder Bore Inside Diameter (Maximum), in (mm) ............ 3.441 (87.40)
Cylinder Head (Max. Out of Flatness), in (mm) ............ 0.004 (0.10)
Valve Clearance (Intake), in (mm) ............ 0.003-0.005 (0.08-0.13)
Valve Clearance (Exhaust), in (mm) ............ 0.005-0.007 (0.13-0.18)
Engine Oil and Filters
Engine Oil Type (Summer) ............ SAE 30, 10W-30
Engine Oil Type (Winter) ............ SAE 5W-30
API Service Classifications ............ SF, SG, SH, SJ or higher
Oil Capacity, qts (L) ............ 1.50 (1.40)
Oil Filter Part Number ............ 492932
Air Filter Element Part Number ............ 496894S
Ignition System
Spark Plug Type ............ Champion RJ19LM
Spark Plug Gap, in (mm) ............ 0.03 (0.76)
Armature Air Gap, in (mm) ............ 0.010-0.014 (0.25-0.36)
Spark Plug Torque, Nm (lb-ft) ............ 20 (14.8)
Service Intervals
Service Pre-Cleaner ............ Every 25 hours
Clean Air Filter ............ Every 25 hours
Change Engine Oil ............ Every 50 hours
Check and Adjust Spark Plug ............ Every 50 hours
Change Engine Oil Filter ............ Every 100 hours
Replace Pre-Cleaner ............ Every 100 hours
Replace Air Filter ............ Every 100 hours
Replace Fuel Filter ............ Every 100 hours
Check Carburetor Adjustment ............ Every 100 hours
Replace Spark Plug ............ Every 100 hours
Briggs and Stratton 28N707 Service Data
Cylinder Block
Cylinder Bore I.D. (Standard), in (mm) ............ 3.437 (87.30)
Cylinder Bore I.D. (Maximum), in (mm) ............ 3.441 (87.40)
Cylinder Bore (Out-Of-Round), in (mm) ............ 0.0015 (0.04)
Main Bearing Bore Diameter (Cylinder Block), in (mm) ............ 1.3776 (34.99)
Camshaft Bearing Bore Diameter (Cylinder Block), in (mm) ............ 0.5015 (12.74)
Main Bearing Bore I.D. (Sump Cover), in (mm) ............ 1.3776 (34.99)
Camshaft Bearing Bore I.D. (Sump Cover), in (mm) ............ 0.501 (12.72)
Crank Pin Journal O.D. (Standard), in (mm) ............ 1.2489 (31.72)
Crank Pin Journal O.D. (Wear Limit), in (mm) ............ 1.2478 (31.69)
Crankshaft Journal O.D. (Magneto Side), in (mm) ............ 1.3759 (34.95)
Crankshaft Journal O.D. (PTO Side), in (mm) ............ 1.3759 (34.95)
Crankshaft End Play, mm (in) ............ 0.002-0.023 (0.05-0.58)
Camshaft Journal O.D. (Magneto Side), in (mm) ............ 0.500 (12.70)
Camshaft Journal O.D. (PTO Side), in (mm) ............ 0.500 (12.70)
Connecting Rod Big End I.D. (Standard), in (mm) ............ 1.2505 (31.76)
Connecting Rod Big End I.D. (Wear Limit), in (mm) ............ 1.2525 (31.81)
Connecting Rod Small End I.D. (Standard), in (mm) ............ 0.8009 (20.34)
Connecting Rod Small End I.D. (Wear Limit), in (mm) ............ 0.8013 (20.35)
Cam Lobes (Intake), in (mm) ............ 1.2213 (21.02)
Cam Lobes (Exhaust), in (mm) ............ 1.2213 (21.02)
Cylinder Head and Valves
Cylinder Head (Max. Out of Flatness), in (mm) ............ 0.004 (0.10)
Valve Clearance (Intake), in (mm) ............ 0.003-0.005 (0.08-0.13)
Valve Clearance (Exhaust), in (mm) ............ 0.005-0.007 (0.13-0.18)
Intake Valve Seat Angle, deg ............ 45
Exhaust Valve Seat Angle, deg ............ 45
Valve Guide I.D. (Standard), in (mm) ............ 0.238 (6.05)
Valve Guide I.D. (Wear Limit), in (mm) ............ 0.240 (6.10)
Valve Stem O.D. (Standard), in (mm) ............ 0.2354 (5.98)
Valve Stem O.D. (Wear Limit), in (mm) ............ 0.2346 (5.96)
Intake Valve Seat Width, in (mm) ............ 0.0470-0.0782 (1.190-1.987)
Exhaust Valve Seat Width, in (mm) ............ 0.0630-0.0779 (1.590-1.980)
Piston and Piston Rings
Piston Pin O.D. (Standard), in (mm) ............ 0.8005 (20.33)
Piston Pin O.D. (Wear Limit), in (mm) ............ 0.8001 (20.31)
Piston Pin Bearing I.D. (Standard), in (mm) ............ 0.8009 (20.34)
Piston Pin Bearing I.D. (Wear Limit), in (mm) ............ 0.8012 (20.36)
Top Ring End Gap (Standard), in (mm) ............ 0.006-0.014 (0.15-0.35)
Middle Ring End Gap (Standard), in (mm) ............ 0.006-0.014 (0.15-0.35)
Oil Ring End Gap (Standard), in (mm) ............ 0.014-0.028 (0.35-0.70)
Top/Middle Ring End Gap (Wear Limit), in (mm) ............ 0.030 (0.76)
Oil Ring End Gap (Wear Limit), in (mm) ............ 0.065 (1.65)
Top Ring Side Clearance (Standard), in (mm) ............ 0.001-0.003 (0.03-0.07)
Middle Ring Side Clearance (Standard), in (mm) ............ 0.001-0.003 (0.03-0.07)
Oil Ring Side Clearance (Standard), in (mm) ............ 0.001-0.003 (0.03-0.07)
Piston Ring Side Clearance (Wear Limit) ............ 0.006 (0.15)
Briggs and Stratton 28N707 Torque Specifications
Air Cleaner Base, Lb-ft (Nm) ............ 4.4 (6)
Armature, Lb-ft (Nm) ............ 2.2 (3)
Blower Housings, Lb-ft (Nm) ............ 7.4 (10)
Blower Housing Brackets, Lb-ft (Nm) ............ 7.4 (10)
Breather, Lb-ft (Nm) ............ 2.9 (4)
Carburetor to Intake Manifold, Lb-ft (Nm) ............ 5.2 (7)
Connecting Rod, Lb-ft (Nm) ............ 15.6 (21)
Control Bracket, Lb-ft (Nm) ............ 3.7 (5)
Cylinder Head, Lb-ft (Nm) ............ 18.5 (25)
Cylinder Shield, Lb-ft (Nm) ............ 3.7 (5)
Exhaust Manifold/Adapter, Lb-ft (Nm) ............ 14.1 (19)
Flywheel Nut, Lb-ft (Nm) ............ 100 (135)
Flywheel Fan, Lb-ft (Nm) ............ 11.9 (16)
Fuel Pump, Lb-ft (Nm) ............ 3.7 (5)
Governor Lever Nut, Lb-ft (Nm) ............ 3.7 (5)
Intake Manifold to Cylinder Head, Lb-ft (Nm) ............ 7.4 (10)
Muffler, Lb-ft (Nm) ............ 14.1 (19)
Oil Drain Plug, Lb-ft (Nm) ............ 10.4 (14)
Oil Pump Cover, Lb-ft (Nm) ............ 7.4 (10)
Spark Plug, Lb-ft (Nm) ............ 14.8 (20)
Starter Motor, Lb-ft (Nm) ............ 11.9 (16)
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