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| Home / Engines / Briggs and Stratton Engines / Briggs and Stratton 28S777 |
Briggs Stratton 28S777 Maintenance
| Engine Model: Briggs and Stratton 28S777 |
| Engine Type: 4-cycle single cylinder OHV vertical shaft gasoline engine |
| Total Displacement: 28.4 cu.in (465 cc) |
| Rated Engine Power: 13.5 Hp (10 kW) at 3300 rpm |
| Fuel System: Float type carburetor with fixed main jet |
| Service Data |
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 ................ 492932S
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 |
Check Engine Oil Level ................ Every 10 hours
Service Air Filter Pre-Cleaner ................ Every 25 hours
Change Engine Oil ................ Every 50 hours
Check and Adjust Spark Plug ................ Every 50 hours
Replace Engine Oil Filter ................ Every 100 hours
Clean Air Filter Cartridge ................ Every 100 hours
Replace Fuel Filter ................ Every 100 hours
Replace Spark Plug ................ Every 100 hours
Replace Air Filter Pre-Cleaner ................ Every 200 hours
Replace Air Filter Cartridge ................ Every 200 hours
Clean Combustion Chamber ................ Every 200 hours
Check Carburetor Adjustment ................ Every 200 hours
Check and Adjust Idle Speed ................ Every 200 hours
Check and Adjust Valve Clearance ................ Every 200 hours
| Replacement Parts |
Air Filter (Cartridge). Part Number ................ 496894S
Air Filter (Pre-Cleaner). Part Number ................ 272403S
Oil Filter. Part Number ................ 492932S, 491056S
Fuel Filter. Part Number ................ 298090S, 394358S
Spark Plug. Part Number ................ 491055S, 691043
Crankshaft Oil Seal (Mag). Part Number ................ 391086S
Crankshaft Oil Seal (PTO). Part Number ................ 291675S
Cylinder Head Gasket. Part Number ................ 273280S
Crankcase Gasket. Part Number ................ 692226
| Tightening Torques |
Air Cleaner Base, lb-ft (Nm) ................ 4.4 (6)
Alternator, lb-ft (Nm) ................ 1.5 (2)
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)
Crankcase Cover, lb-ft (Nm) ................ 18.5 (25)
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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