Troubleshooting

The consumer products safety commission mandate states that the blade of a homeowner type walk-behind rotary mower must stop within how many seconds after the operator leaves safe position?

3 seconds

Most air-cooled engines operate with oil temperatures that exceed ________ degrees.

610

What is an engine cylinder balance test

A test to measure if each cylinder is doing an equal amount of work.

There are only two types of tests to perform on Briggs and Stratton alternator systems. The tests are:

AC volts from the Stratford and/or DC amps in series to the positive terminal of the battery

An engine is received with the customer complaint of "very hard to start when cold - runs well once started and warmed up". Technician A says that the most common reason for these symptoms is mid-adjusted choke linkage or cable. Technician B says that this could be caused by a leaking exhaust valve allowing maverick air into the combustion chamber through the muffler. What technician is correct?

Both technician A and B

Customer supplied information does not help troubleshooting.

False

Surging is the undesirable quick changing of engine speed when set at a desired speed

False

A probable cause to an engine that lacks power, has difficulty achieving rpm and has gasoline soaked air filter element is:

Float level too low.

Hunting and surging under lid indicates a problem with the _________

Governor system

An engine vibrates excessively while running. A probable cause of the problem is?

Loose Mounting Bolts

When an engine operates correctly and creates satisfactory power under load but not at partial load the _______________ are not at fault.

Main jet, fuel supply, and high speed air bleed

A probable cause to an engine that lacks power, has difficulty achieving rpm and has a gasoline soaked air filter element is:

Plug gapped incorrectly

An engine that runs rich and exhibits black smoke from the exhaust is MOST likely a symptom of:

Restricted air Intake

An engine with a mechanical governor runs too fast. Technician A says the governor gear inside is damaged and must be removed and disassembled. Technician B says to remove the governor spring and start the engine. Quickly move the throttle shaft from idle to fast to see what happens. Who has the best advice?

Technician A

An engine is received that hunts and surges at top no-load speeds only. To determine whether the carburetor or the governor system is causing symptom. A specific troubleshooting process should be followed.

Technician B

What is the relationship between the governor and the throttle? Technician A says that it is the throttle shaft that moves the governor lever. Technician B says that the governor lever moves the throttle shaft. Who is correct?

Technician B

When the ignition switch on a lawnmower is turned to the off position while the engine is running at top no load speed, the spark of the combustion chamber is interrupted and the engine coasts down to a stop. Which of the following statements best describes the action of the governor system during the engine "coast down" period?

The governor slowly closes the throttle plate in the carburetor

A compression test is a good method to help diagnose ring wear.

True

All governing systems are made up of two primary components. One component is responsible for opening the throttle plate and the other is for closing the throttle plate. The governor speed of the engine is achieved when the governor spring tension is equal to 1/2 the pressure created by air forces against the air cane paddle or the centrifugal force of the mechanical flyweights pressing against the governor arm.

True

Any debris lodged in the main jet of the carburetor can cause the engine to appear over choked

True

Any debris lodged in the main jet of the carburetor can cause the engine to appear over-choked.

True

Hunting and surging at true idle is caused by a fuel delivery problem or air leaks can cause true idle to hunt and surge.

True