Tecumseh H70 Troubleshooting
| Engine Model: Tecumseh H70 |
| Engine Type: 4-cycle 1-cylinder L-head air-cooled gasoline |
| Total Displacement: 15 cu.in (246 cc) |
| Rated Engine Power: 7 Hp (4.5 kW) at 3600 rpm |
| Fuel System Type: Float carburetor with adjustable jet |
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| Engine starts up hard or will not start |
Empty fuel tank - Fill gasoline up.
Improper fuel grade - Change gasoline.
Water or air in fuel system - Remove air or water from system.
Defective wiring connection of spark plug - Inspect the spark plug wire connection, replace or repair.
Damaged spark plug - Change spark plug.
Dirty fuel filter - Fuel filter needs changing.
Safety contact for brake pedal defective - Install new part.
Carburetor is not working properly - Inspect and adjust.
Low engine compression - Inspect cylinder block and change defective components.
Damaged or incorrectly adjusted choke cable - Replace cable or adjust correctly.
Cooling fins are blocked - Need to wash or clean.
Defective ignition - Test ignition and replace failed parts.
Stuck or defective choke cable - Clean or change the cable.
Plugged air filter - Replace or clean air filter.
Dirty or defective fuel pump - Check fuel pump and replace if necessary.
| Engine stops after starting |
Spark plug is faulty - Spark plug need to be replaced.
Dirty or faulty carburetor - Clean or replace carburetor.
Faulty ignition coil - Ignition coil must be replaced.
Worn or loose valve springs - Install new valve springs.
Stuck valves - Valves must be cleaned.
Engine oil insufficient - Check oil level and add oil as required.
Engine is overloaded - Load reducing required.
Cooling fins are clogged - Need to clean or wash.
Too lean fuel mixture in carburetor - Adjust carburetor correctly.
Incorrect ignition timing - Adjust ignition timing as required.
Incorrect valve setting - Valves needs to be set correctly.
Stale or low octane fuel - Change fuel.
Engine overload - Load reducing required.
Engine oil level is insufficient - Fill the crankcase with engine oil.
Incorrect low idle setting - Adjust as required.
Clogged or defective fuel pump - Check fuel pump and change if required.
Main bearings or crankshaft are worn out - Crankshaft or bearings need to be replaced.
Valve clearance is incorrect - Adjust valve clearance according to specifications.
Worn cylinder bore or piston rings - Change faulty parts.
Dirty or improperly adjusted carburetor - Clean or properly adjust carburetor.
Clogged air filter - Replace or service air filter.
Clogged or damaged fuel pump - Check fuel pump and change if required.
Ignition failure - Inspect ignition system and change faulty parts.
Cylinder head gasket is blown - Replace cylinder head gasket.
Burned or stuck valves - Change or clean valves.
Push rod is worn or bent - Change push rod.
Cylinder block components are faulty - Replace defective parts.
Oil filter is blocked (if equipped) - Replace or service oil filter.
| Excessive fuel consumption |
Throttle not fully open - Check throttle cable and adjust as required.
Carburetor main jet is improperly adjusted - Adjust it correctly.
Loose or defective spark plug - Replace or tighten spark plug.
Valves are stuck, burned, or worn - Replace or service valves.
Worn sleeve, rings, or piston - Replace faulty parts as required.
Valve clearance is incorrect - Adjust valve clearance according to specifications.
| Engine consuming too much oil |
Seals or gaskets are defective - To repair leaks, replace worn parts.
Worn valve stems and valve guides - Replace the valves.
Worn or broken piston rings - Have piston rings replaced.
Cylinder liner or piston is damaged - Inspect liner and piston, fit new parts as necessary.
Breather pipe or hose is clogged - Clean or change.
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