Tecumseh LH318SA-156552G engine Parts

The Tecumseh LH318SA-156552G is a 9 HP horizontal-shaft lawn and garden engine. When you are matching parts or swapping engines, horsepower is only one factor; shaft diameter/length and mounting pattern must match your equipment.

We recommend verifying these basics so the engine fits and runs correctly:

• Shaft diameter and shaft length (critical for pulleys and drive systems)
• Crankshaft type (keyway, tapped end, etc.)
• Mounting bolt pattern and base style
• Fuel system type (carburetor style and linkage)
• Ignition/kill wire setup (stop switch wiring)

If the engine is down on power, surging, or hard to start, these parts are often involved:

• Carburetor and internal wear items
• Air filter restriction
• Fuel cap venting problems
• Float/needle sealing issues that cause rich or lean running

Helpful model-matched options from our parts list include:

• Craftsman lawn & garden equipment engine carburetor 640349
• Tecumseh lawn and garden equipment engine carburetor rebuild kit 632760B
• Craftsman lawn & garden equipment engine air filter 28424
• Lawn & garden equipment engine fuel tank cap 37845

Using the correct horsepower rating helps you avoid underpowered performance, but fit and fuel/ignition compatibility determine whether the engine will actually work well on your machine. Matching the carburetor and fuel system parts to the LH318SA-156552G keeps starting and throttle response consistent.

Last updated: February 2026

On a Tecumseh LH318SA-156552G lawn and garden engine, 318 is typically part of the engine’s model or specification family identifier used to distinguish this engine series from other Tecumseh builds. It is not a fault code; it helps match the correct carburetor, ignition, and fuel system parts.

Most commonly, “318” shows up in places that identify the engine, not its condition:

• In the engine model string (for example, LH318SA-156552G)
• On the engine ID/spec decal or tag (often near the blower housing)
• In parts listings to separate similar Tecumseh engines that use different carburetors, gaskets, or linkages
• In service notes that group engines by displacement and configuration

When you’re selecting parts for this Tecumseh engine, use the full model number LH318SA-156552G first, then confirm the part by name and ID.

• If the engine runs rough, surges, or won’t start, the fuel system is the first place to check
• If it starts but won’t keep running, inspect air intake and carburetor sealing surfaces
• If it won’t shut off, check the stop wire and kill circuit connections

Tecumseh engines often have multiple close variants that look the same but use different carburetor calibrations, gaskets, and linkages. Treating “318” as part of the engine’s identification helps prevent ordering a carburetor or rebuild kit that does not fit your exact LH318SA-156552G configuration.

Last updated: February 2026

Yes. For your Tecumseh LH318SA-156552G lawn and garden engine, we use synthetic oil as long as the viscosity matches the temperature range you operate in (synthetic 5W-30 is a common all-around choice). If the engine is worn and starts smoking or using oil, switching to conventional SAE 30 often reduces consumption.

• Synthetic 5W-30: best for easier cold starts and wide temperature swings
• Conventional SAE 30: best for steady warm-weather mowing and often helps reduce oil burning in worn engines
• Avoid mixing viscosities randomly: if you change types, do a normal oil change so you start with a consistent fill

• Check oil level before each use; low oil can damage the crankshaft and rings quickly.
• Change oil when it looks dark, smells like fuel, or after heavy seasonal use.
• If you see fuel smell in the oil, inspect the carburetor for flooding issues; a sticking float/needle can cause dilution.
• Keep the air filter clean; a restricted filter can make the engine run rich and contribute to smoke.

Oil choice affects starting, wear protection, and oil consumption. Synthetic oil protects well and starts easier in cold weather, but a worn Tecumseh engine can show increased smoke because thinner cold-flow characteristics can slip past worn rings and guides.

• Needle valve 631021B
• Lawn & garden equipment engine carburetor float bowl 631951
• Tecumseh lawn and garden equipment engine carburetor rebuild kit 632760B

Last updated: February 2026

Tecumseh engines like model LH318SA-156552G usually get hard to start when fuel delivery or airflow is restricted, or when ignition and compression conditions make the recoil harder to pull. The most common causes are stale fuel varnishing the carburetor, a dirty air filter, or a carburetor needle and bowl issue.

• Old fuel: Drain the tank and carburetor bowl; refill with fresh fuel.
• Carburetor varnish or blockage: Symptoms include needing choke to keep it running or only starting with starting fluid.
• Dirty air filter: A restricted filter can make starting and idling unstable; replace the craftsman lawn & garden equipment engine air filter 28424.
• Fuel cap venting problem: A plugged vent can create vacuum in the tank and starve the carburetor.
• Float/needle not sealing or sticking: Can flood the engine or starve it; the needle valve 631021B and lawn & garden equipment engine carburetor float bowl 631951 are common wear points.
• Spark plug condition: A fouled or incorrectly gapped plug can make cold starts difficult.

1. Try a fresh-fuel reset: Drain old fuel, add fresh fuel, and try starting with choke.
2. Loosen the fuel cap: If it starts or runs better with the cap loosened, the cap venting is the issue.
3. Check the air filter: If it is oily, torn, or packed with debris, replace it.
4. Look for flooding: Strong fuel smell, wet plug, or fuel dripping from the carb points to a float/needle problem.
5. Confirm strong spark: If spark is weak or intermittent, address ignition before rebuilding the carb.

Hard starting is usually the first sign of fuel system contamination from storage. Fixing it early prevents repeated rope yanks, plug fouling, and carburetor flooding that can turn a simple tune-up into a bigger repair.

Last updated: February 2026

Yes. You can still get replacement parts for Tecumseh engines, including the Tecumseh LH318SA-156552G, by matching your engine model and then ordering common service parts such as carburetor components, O-rings, starter parts, and ignition items from the parts list for your engine.

We recommend using the engine model number (LH318SA-156552G) first, then confirming the part by name and diagram location.

• Match the full engine model number and spec code on the engine shroud
• Identify the system you are repairing (fuel, ignition, starting, governor)
• Compare the old part to the listing (shape, mounting holes, linkage points)
• Replace gaskets and O-rings any time you open the carburetor or fuel bowl
• If the engine sat with old fuel, plan on cleaning or rebuilding the carburetor

These are typical wear items that remain available for many Tecumseh lawn and garden engines:

Tecumseh engines are widely used on older lawn and garden equipment, so keeping the correct model number and using exact part IDs helps you avoid ordering the wrong carburetor, gasket, or ignition component and gets your engine running reliably again.

Last updated: February 2026