________________________________________________________________________________________
| Home / Engines / Briggs and Stratton Engines / Briggs and Stratton 31E777 |
Briggs and Stratton 31E777 Problems
| Engine Model: Briggs and Stratton 31E777 |
| Engine Type: 4-cycle single cylinder OHV vertical shaft gasoline engine |
| Total Displacement: 30.6 cu.in (500 cc) |
| Rated Engine Power: 16.5 Hp (12.2 kW) at 3600 rpm |
| Fuel System: Float type carburetor with fixed main jet |
| Engine starts hard or doesn't start |
No fuel in fuel tank - Add gasoline.
Improper fuel grade - Change fuel.
Air in fuel tank - Bleed fuel tank.
Damaged spark plug wiring connection - Inspect spark plug wiring connection, change or repair.
Defective spark plug - Replace spark plug.
Fuel filter is clogged - Install new filter.
Brake pedal not pushed down - Push the brake pedal down.
Carburetor is not working properly - Inspect and adjust.
Engine has low compression - Check cylinder block and replace defective parts.
Choke cable is worn or not adjusted properly - Replace cable or adjust correctly.
| Irregular engine running |
Air intake grill is clogged - Clean and wash as required.
Defective ignition - Check ignition and replace faulty components.
Throttle cable is defective or stuck - Replace or clean the cable.
Clogged air filter - Service or change air filter.
Dirty or damaged fuel pump - Check fuel pump and change if required.
| Engine starts and then stalls |
Spark plug is damaged - Spark plug need to be replaced.
Carburetor is dirty or faulty - Replace or service carburetor.
Ignition coil is faulty - Ignition coil must be replaced.
Bad or damaged valve springs - Install new valve springs.
Valves sticking - Valves need to be cleaned.
| Engine is overheated |
Low engine oil level - Check oil level and add oil as required.
Engine is under excessive load - Reduce load.
Air intake screen is blocked - Wash or clean as required.
Too lean carburetor mixture - Make the correct settings.
Improper ignition timing - Adjust ignition timing as required.
Valve setting is wrong - Set the valves correctly.
| Abnormal engine knocking or noise |
Low octane gasoline - Change gasoline.
Engine is overloaded - Reduce the load.
Low engine oil level - Need to add engine oil.
Low idle speed adjustment is incorrect - Need to adjust idle speed.
Fuel pump is defective or dirty - Check fuel pump and change if required.
Worn main bearings or crankshaft - Change defective components as required.
Valve clearance is not correct - Adjust valve clearance according to specifications.
Worn cylinder bore or piston rings - Change faulty parts.
| Low engine power |
Dirty or improperly adjusted carburetor - Service or correctly adjust carburetor.
Dirty air filter element - Clean or change air filter.
Dirty or damaged fuel pump - Check fuel pump and replace if necessary.
Defective ignition - Check ignition and replace faulty components.
Blown cylinder head gasket - Replace the gasket as required.
Burned or stuck valves - Replace or service valves.
Push rod is worn or damaged - Replace push rod.
Worn cylinder block components - Change defective components.
Dirty oil filter element (if equipped) - Clean or change oil filter.
| Engine uses too much fuel |
Choke doesn't open well - Adjust or replace choke cable.
Improper carburetor main jet adjustment - Adjust it correctly.
Spark plug is faulty or loose - Re-tighten or replace spark plug.
Worn, stuck, or burned valves - Replace or clean valves.
Worn rings, piston, or sleeve - Change defective parts.
Improper valve clearance - Adjust to proper valve clearance.
| Engine using too much oil |
Damaged seals or gaskets - Change worn parts according to specifications.
Damaged valve stems or valve guides - Install new valves.
Worn or broken piston rings - Piston rings need to be replaced.
Damaged piston or cylinder liner - Inspect piston and liner, replace as required.
Blocked breather pipe or hose - Replace or clean.
________________________________________________________________________________________
________________________________________________________________________________________
| Engines Technical Specifications |