Ag Mech 2 5.00

What engines require that points and condenser be replaced?

• older

• larger

• newer

• smaller

Answer explanation

Older engines typically use points and condensers for ignition systems, which require replacement over time. Newer engines often utilize electronic ignition systems that do not have these components.

If a chain saw is to be stored for the summer, the fuel tank should be:

• full.

• empty.

• one-fourth full.

• three-fourths full.

Answer explanation

Storing a chain saw with an empty fuel tank prevents fuel degradation and reduces the risk of engine damage. A full or partially full tank can lead to issues like fuel evaporation or contamination during storage.

Changing the oil is the main service done on a four-cycle engine’s:

• coolant system.

• transmission.

• fuel system.

• lubrication system.

Answer explanation

Changing the oil is essential for maintaining the lubrication system of a four-cycle engine, as it ensures proper lubrication of engine components, reducing friction and wear.

If an engine has fuel and compression but fails to start, what is the likely problem?

• ignition

• oil

• rings

• water

Answer explanation

If an engine has fuel and compression but won't start, the likely issue is with the ignition system. It may not be providing the necessary spark to ignite the fuel-air mixture, preventing the engine from starting.

A new model small engine will lack:

• points.

• pistons.

• a piston.

• a spark plug.

Answer explanation

The new model small engine will lack points because modern engines often use electronic ignition systems instead of traditional points, which are mechanical components used in older ignition systems.

Checking the engine oil level is a service unnecessary for:

• two-cycle engines.

• four-cycle engines.

• combines

• tractors

Answer explanation

Two-cycle engines do not have a separate oil reservoir; they mix oil with fuel. Therefore, checking the engine oil level is unnecessary for them, unlike four-cycle engines, combines, and tractors that require regular oil level checks.

Oil filters should be changed when the:

• oil is changed.

• air filter is changed.

• fuel filter is changed.

• antifreeze is changed.

Answer explanation

Oil filters should be changed when the oil is changed to ensure optimal engine performance and to prevent contaminants from circulating in the engine. Changing the oil filter at the same time as the oil helps maintain engine health.

The main service performed on a spark plug is to:

• oil it.

• paint it.

• repair it.

• replace it.

Answer explanation

The main service performed on a spark plug is to replace it. Spark plugs wear out over time and need to be replaced to ensure proper engine performance, unlike oiling or painting, which are not standard maintenance practices.

Checking the water and cleaning the radiator on tractors and other self-propelled equipment are preventive maintenance for the:

• engine.

• transmission.

• brakes.

• tires.

Answer explanation

Checking the water and cleaning the radiator are essential for maintaining the engine's cooling system, preventing overheating and ensuring optimal performance. Thus, these tasks are preventive maintenance for the engine.

Cleaning the outside parts of a small engine is the most important maintenance for the:

• fuel system.

• cooling system.

• electrical system.

• lubrication system.

Answer explanation

Cleaning the outside parts of a small engine is crucial for the cooling system, as dirt and debris can obstruct airflow and cooling fins, leading to overheating. Proper maintenance ensures efficient engine operation.