Diesel and Gasoline Engines Specifications and Service Data

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Briggs and Stratton 331777 Intek Engine

General Technical Data

Briggs and Stratton 331777 Engine Specifications

Engine Model - Briggs and Stratton 331777 Intek
Engine Type - 4-cycle single cylinder OHV vertical shaft air-cooled gasoline engine
Number of Cylinders - 1
Displacement, cu.in (cc) - 32.95 (540)
Cylinder Bore, in (mm) - 3.70 (94.0)
Piston Stroke, in (mm) - 3.06 (78.0)
Rated Engine Power, hp (kW) - 20.0 (14.9)
Rated Engine Speed, rpm - 3600
Idle Speed, rpm - 1750
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
Charging System Rating, Amps - 9

Fuel System

Fuel System Type - Carburetor
Carburetor Type - Float
Fuel Pump - Pulse type
Governor Type - Mechanical
Fuel Type - Gasoline

Briggs and Stratton 331777 Maintenance Data

Cylinder Block and Valves

Cylinder Bore Inside Diameter (Maximum), in (mm) - 3.705 (94.11)
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) - 1.48 (1.40)
Oil Filter Part Number - 492932S
Air Filter Element Part Number - 753569

Ignition System

Spark Plug Type - Champion RC12YC
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 Air Filter 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 Air Filter - Every 100 hours
Replace Inline Fuel Filter - Every 100 hours
Check Carburetor Adjustment - Every 100 hours
Replace Spark Plug - Every 100 hours
Check Valve Clearance - Every 200 hours

Briggs and Stratton 331777 Service Data

Cylinder Block

Cylinder Bore Inside Diameter (Standard), in (mm) - 3.701 (94.01)
Cylinder Bore Inside Diameter (Maximum), in (mm) - 3.705 (94.11)
Cylinder Bore (Out-Of-Round), in (mm) - 0.0015 (0.04)
Main Bearing Bore Diameter (Cylinder Block), in (mm) - 1.6248 (41.27)
Main Bearing Bore Diameter (Crankcase Cover), in (mm) - 1.6248 (41.27)
Camshaft Bearing Bore Diameter (Cylinder Block), in (mm) - 0.5011 (15.88)
Camshaft Bearing Bore Diameter (Crankcase Cover), in (mm) - 0.501 (12.72)
Crank Pin Journal Outside Diameter (Standard), in (mm) - 1.6235 (41.24)
Crank Pin Journal Outside Diameter (Wear Limit), in (mm) - 1.6225 (41.21)
Crankshaft Journal Outside Diameter (Magneto Side), in (mm) - 1.6235 (41.24)
Crankshaft Journal Outside Diameter (PTO Side), in (mm) - 1.6235 (41.24)
Crankshaft Eccentrics (Standard), in (mm) - 2.681 (68.10)
Crankshaft Eccentrics (Wear Limit), in (mm) - 2.6793 (68.05)
Crankshaft End Play, in (mm) - 0.002-0.020 (0.05-0.51)
Camshaft Journal Outside Diameter (Magneto Side), in (mm) - 0.499 (12.67)
Camshaft Journal Outside Diameter (PTO Side), in (mm) - 0.499 (12.67)
Connecting Rod Big End Inside Diameter (Standard), in (mm) - 1.100 (27.94)
Connecting Rod Big End Inside Diameter (Wear Limit), in (mm) - 1.102 (27.99)
Connecting Rod Small End Inside Diameter (Standard), in (mm) - 0.6258 (15.89)
Connecting Rod Small End Inside Diameter (Wear Limit), in (mm) - 0.6268 (15.92)

Counterweight System

Pivot Shaft Bore (Standard), in (mm) - 1.100 (27.94)
Pivot Shaft Bore (Wear Limit), in (mm) - 1.102 (27.99)
Counterweight Pin Bore (Standard), in (mm) - 1.100 (27.94)
Counterweight Pin Bore (Wear Limit), in (mm) - 1.102 (27.99)
Link Pin (Standard), in (mm) - 1.100 (27.94)
Link Pin (Wear Limit), in (mm) - 1.102 (27.99)
Connector Link Bore (Standard), in (mm) - 1.100 (27.94)
Connector Link Bore (Wear Limit), in (mm) - 1.102 (27.99)
Eccentric Bearing (Standard), in (mm) - 0.6258 (15.89)
Eccentric Bearing (Wear Limit), in (mm) - 0.6268 (15.92)

Cylinder Head and Valves

Cylinder Head (Max. Out of Flatness), in (mm) - 0.004 (0.10)
Intake Valve Clearance, in (mm) - 0.003-0.005 (0.08-0.13)
Exhaust Valve Clearance, in (mm) - 0.005-0.007 (0.13-0.18)
Valve Guide Inside Diameter (Standard), in (mm) - 0.237 (6.02)
Valve Guide Inside Diameter (Wear Limit), in (mm) - 0.240 (6.10)
Intake Valve Stem Outside Diameter (Standard), in (mm) - 0.235 (5.97)
Intake Valve Stem Outside Diameter (Wear Limit), in (mm) - 0.233 (5.92)
Exhaust Valve Stem Outside Diameter (Standard), in (mm) - 0.235 (5.97)
Exhaust Valve Stem Outside Diameter (Wear Limit), in (mm) - 0.233 (5.92)
Cam Lobes (Intake), in (mm) - 1.240 (31.49)
Cam Lobes (Exhaust), in (mm) - 1.240 (31.49)

Piston and Piston Rings

Piston Pin Outside Diameter (Standard), in (mm) - 0.6247 (15.87)
Piston Pin Outside Diameter (Wear Limit), in (mm) - 0.6242 (15.85)
Piston Pin Bearing Inside Diameter (Standard), in (mm) - 0.6258 (15.89)
Piston Pin Bearing Inside Diameter (Wear Limit), in (mm) - 0.6268 (15.92)
Top Ring End Gap (Standard), in (mm) - 0.006-0.010 (0.15-0.25)
Top Ring End Gap (Wear Limit), in (mm) - 0.020 (0.51)
Second Ring End Gap (Standard), in (mm) - 0.012-0.020 (0.30-0.51)
Second Ring End Gap (Wear Limit), in (mm) - 0.030 (0.76)
Oil Ring End Gap (Standard), in (mm) - 0.020-0.025 (0.51-0.63)
Oil Ring End Gap (Wear Limit), in (mm) - 0.035 (0.89)
Piston Ring Side Clearance (Standard), in (mm) - 0.002-0.003 (0.051-0.076)
Piston Ring Side Clearance (Wear Limit) - 0.004 (0.010)

Briggs and Stratton 331777 Torque Specifications

Air Cleaner Base, Lb-ft (Nm) - 4.4 (6.0)
Alternator, Lb-ft (Nm) - 1.5 (2.0)
Armature, Lb-ft (Nm) - 2.2 (3.0)
Blower Housings, Lb-ft (Nm) - 7.4 (10.0)
Breather, Lb-ft (Nm) - 2.2 (3.0)
Carburetor to Intake Manifold, Lb-ft (Nm) - 5.9 (8.0)
Carburetor Solenoid, Lb-ft (Nm) - 3.7 (5.0)
Connecting Rod, Lb-ft (Nm) - 12.6 (17.0)
Control Bracket, Lb-ft (Nm) - 2.2 (3.0)
Crankcase Sump, Lb-ft (Nm) - 18.5 (25.0)
Cylinder Head, Lb-ft (Nm) - 18.5 (25.0)
Cylinder Shield, Lb-ft (Nm) - 3.7 (5.0)
Exhaust Manifold/Adapter, Lb-ft (Nm) - 14.1 (19.0)
Flywheel Nut, Lb-ft (Nm) - 100.0 (135.0)
Flywheel Fan, Lb-ft (Nm) - 11.9 (16.0)
Fuel Pump, Lb-ft (Nm) - 7.4 (10.0)
Governor Lever Nut, Lb-ft (Nm) - 3.7 (5.0)
Intake Manifold to Cylinder Head, Lb-ft (Nm) - 7.4 (10.0)
Muffler, Lb-ft (Nm) - 7.4 (10.0)
Oil Drain Plug, Lb-ft (Nm) - 8.1 (11.0)
Oil Fill Tube, Lb-ft (Nm) - 7.4 (10.0)
Oil Pump Cover, Lb-ft (Nm) - 7.4 (10.0)
Regulator/Rectifier, Lb-ft (Nm) - 3.7 (5.0)
Rewind Starter, Lb-ft (Nm) - 2.2 (3.0)
Rocker Ball Set Screw or Nut, Lb-ft (Nm) - 3.7 (5.0)
Spark Plug, Lb-ft (Nm) - 14.8 (20.0)
Starter Motor, Lb-ft (Nm) - 11.9 (16.0)
Rocker Cover, Lb-ft (Nm) - 5.2 (7.0)

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