Briggs and Stratton 331877

Briggs and Stratton 331877The Briggs and Stratton 331877 Intek Plus Platinum is a 540 cc (32.9 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine, manufactured by Briggs and Stratton.

The B&S 331877 engine has an OHV (overhead) design and a vertical PTO shaft. This engine is equipped with float type carburetor, pulse type fuel pump and an electronic ignition system. The B&S 331877 engine used a paper air filter with a foam pre-cleaner. It is equipped with an electric starter (12V).

The cylinder bore is 94.0 mm (3.7 in) and the piston stroke is 77.8 mm (3.06 in). This engine produced 20.3 PS (14.9 kW; 20.0 HP) at 3,600 rpm of horsepower.

The breakdown of the engine code is as follows:

  • 33 – Displacement
  • 1 – Basic design series
  • 8 – Vertical PTO-shaft
  • 7 – Plain bearing, Pressure lubrication
  • 7 – Electric starter

General information

Engine Specifications
Model B&S 331877 Intek Plus Platinum
Type 4-stroke, OHV, single-cylinder
Displacement 540 cm 3 (32.9 cu-in)
Max. horsepower 20.3 PS (14.9 kW; 20.0 HP) at 3,600 rpm
Max. torque
Fuel system Float type carburetor
Cooling system Forced-air
Ignition system Electronic
Lubricating system Full pressure
Starting system Electric starter
Fuel used Gasoline
Fuel tank capacity

Cylinder Block and Head

Cylinder block
Bore x Stroke 94.0 mm X 77.8 mm (3.70 x 3.06 in)
Sleeve internal diameter 94.010-94.110 mm (3.7012-3.7051 in)
Number of piston rings (compression / oil): 2 / 1
Side clearance Top 0.051-0.076 mm (0.002-0.003 in)
Second 0.051-0.076 mm (0.002-0.003 in)
Oil 0.051-0.076 mm (0.002-0.003 in)
Ring end gap Top 0.150-0.250 mm (0.0059-0.0098 in)
Second 0.300-0.510 mm (0.0118-0.0201 in)
Oil 0.510-0.630 mm (0.0201-0.0248 in)
Connecting rod small end ID 15.890-15.920 mm (0.6256-0.6268 in)
Piston pin outer diameter 15.850-15.890 mm (0.624-0.6256 in)
Cylinder Head
Valve Arrangement: OHV (overhead)
Valves: 2
Valve steam diameter INTAKE 5.920-5.970 mm (0.233-0.235 in)
EXHAUST 5.920-5.970 mm (0.233-0.235 in)

Tightening torque specs

Tightening torque specs
Air cleaner base 6.0 Nm; 4.4 ft·lb
Alternator 2.0 Nm; 1.5 ft·lb
Armature 3.0 Nm; 2.2 ft·lb
Blower housings 10.0 Nm; 7.4 ft·lb
Breather 3.0 Nm; 2.2 ft·lb
Carburetor to intake manifold 8.0 Nm; 5.9 ft·lb
Carburetor solenoid 5.0 Nm; 3.7 ft·lb
Connecting rod 17.0 Nm; 12.6 ft·lb
Control bracket 5.0 Nm; 3.7 ft·lb
Crankcase sump 25.0 Nm; 18.5 ft·lb
Cylinder head 25.0 Nm; 18.5 ft·lb
Cylinder shield 5.0 Nm; 3.7 ft·lb
Exhaust manifold / adapter 19.0 Nm; 14.0 ft·lb
Flywheel nut 135.0 Nm; 100.0 ft·lb
Flywheel fan 16.0 Nm; 11.9 ft·lb
Fuel pump 10.0 Nm; 7.4 ft·lb
Governor lever nut 5.0 Nm; 3.7 ft·lb
Intake manifold to cylinder head 10.0 Nm; 7.4 ft·lb
Muffler 10.0 Nm; 7.4 ft·lb
Oil drain plug 11.0 Nm; 8.1 ft·lb
Oil fill tube 10.0 Nm; 7.4 ft·lb
Oil pump cover 10.0 Nm; 7.4 ft·lb
Regulator / Rectifier 5.0 Nm; 3.7 ft·lb
Rewind starter 3.0 Nm; 2.2 ft·lb
Rocker ball set screw or nut 5.0 Nm; 3.7 ft·lb
Rocker cover 7.0 Nm; 5.2 ft·lb
Starter motor 16.0 Nm; 11.9 ft·lb

Service Information

Engine
Max speed 3,600 rpm
Valve clearance
Intake valve clearance 0.08-0.13 mm (0.003-0.005 in)
Exhaust valve clearance 0.13-0.18 mm (0.005-0.007 in)
Oil system
Oil type API SF, SG, SH, SJ or higher
Recommended oil Summer: SAE 30, 10W-30
Winter: SAE 5W-30
Oil capacity (with filter) 1.40 L (1.48 US. qt, 1.23 Imp. qt.)
Ignition system
Spark plug Champion RC12YC
Spark plug gap 0.7-0.8 mm (0.0276-0.0315 in)
ATTENTION! Dear visitors, this site is not a trading platform, an official dealer or a spare parts supplier, so we do not have any price lists or spare parts catalogs. We are an information portal and provide the technical specifications of gasoline and diesel engines.

We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

Be the first to comment

Leave a Reply

Your email address will not be published.


*