These were the REQUIREMENTS
before the REVISIONS made on January 1, 2001.
To see the current requirements
NOTE: Access to an automobile or truck (with owners manual) is
needed to meet some of the requirements for this merit badge.
- Discuss with your counselor the safety equipment, tools,
and clothing used while checking or repairing a motor vehicle.
Use the equipment, tools, and/or clothing (when needed of called
for) in meeting the requirements for this merit badge.
- Explain how an internal combustion engine operates and the
differences between gasoline and diesel engines.
- Demonstrate you knowledge of general maintenance. Do the
- Demonstrate how to check the fluid level of the following:
- Brake Fluid
- Engine Oil
- Power steering fluid
- Windshield washer fluid
- Transmission fluid (automatic and standard)
- Check battery fluid, if possible, and the condition
of battery terminals.
- Show the location of fuse boxes and the size of fuses,
and demonstrate the proper replacement of burned-out fuses.
- Review the maintenance chart in the owner's manual.
Explain the requirements and time limits.
- Choose a care cleaner and wax product for the vehicle.
explain clear-coat paint and the precautions necessary
for care. Clean and wax the vehicle, both inside and
- Use a vinyl and rubber protectant (on vinyl tops,
rubber door seals, sidewalls, etc.) and explain the
importance of this protectant.
- Demonstrate how to check the condition and tension of
belts and hoses.
- Demonstrate the following:
- Check the lighting in the vehicle, including instrument,
warning, and exterior bulbs.
- Check headlight alignment
- Demonstrate how to check the vehicle exhaust system.
- Demonstrate your knowledge of the following:
- Explain the difference between tire and vehicle
manufacturer's information specifications and demonstrate
where to find these specifications.
- Demonstrate how to check pressure and properly inflate
- Using the manufacturer's jack supplied with the
- Demonstrate how to engage the jack correctly
on the vehicle.
- Demonstrate how to correctly change a tire.
- Explain the difference between bias-belted tires
and radial-belted tires.
- Diagram and explain in writing how to rotate bias-belted
and radial-belted tires.
- Using the manufacturer's guidelines, rotate the
tires on the vehicle.
- Explain the camber, caster, and toe-in adjustments
on wheel alignment.
- Explain why wheel alignment is important to the
life of a tire.
- Explain the purpose of the lateral-wear bar indicator.
- Explain how to dispose of old tires properly.
- Demonstrate your knowledge of engine lubrication. Do the
- Explain the purpose of motor oil.
- Explain where to find the recommended type and amount
of oil to be used in the vehicle engine.
- Explain the difference in viscosity (10W/30 versus SAE
- Perform an oil change and oil filter change on a vehicle.
- Explain how to dispose of the used oil and filter properly.
- Cooling system Do the following:
- Explain the need for coolant in the cooling system.
- Flush and change the engine coolant in the vehicle according
to the manufacturer's instructions.
- Explain how to dispose of used coolant properly.
- Demonstrate your knowledge of a fuel system. Do the following:
- Explain how the air and fuel system work together.
- Explain how a carburetor works and how a fuel- injection
- Explain how an on-board computer works with the fuel
injection system. Show where the computer is located.
- Explain why it is necessary to have an air filter and
a fuel filter. Locate them and change them according to
the manufacturer's recommendations.
- Explain what fuel additives are. for both the carburetor
and the fuel injection systems.
- Demonstrate your knowledge of ignition and electrical systems.
Do the following:
- Diagram and explain the parts of the electrical system.
- Explain the cylinder engine sequence.
- Explain the spark plug gap and if practical, change
the spark plug. (Use an engine with spark plugs that can
be reached without tilting the engine.)
- Demonstrate how to connect jumper cables on your battery
properly. Explain how to jump-start a vehicle.
- Explain the difference between electronic and point
- Demonstrate your knowledge of a drive train. Do the following:
- Diagram the drive train and explain the different parts.
- Explain the difference between automatic and standard
- Explain the types of automatic transmission fluid.
- Explain the types of lubricants used in a standard transmission
and in the differential.
- Explain the difference between front-wheel, rear- wheel,
and four-wheel drive.
- Explain the gear ratio of the differential.
- Demonstrate your knowledge of a brake system. Do the following:
- Explain the brake system (including anti-lock systems)
and how it operates.
- Explain the differences between disk and shoe systems.
- Demonstrate checking conditions on a vehicle brake system.
After checking make a recommendation for repairs (if necessary).
- Explain the purpose, importance, and limitations of passive
BSA Advancement ID#: 127
Pamphlet Revision Date: 2000
Requirements last updated in 2001