Boy Scout Merit Badge
NOTE: Access to an automobile or truck (with an 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 this equipment, tools, and/or
clothing (when needed or called for) in meeting the requirements for this
- Explain how an internal combustion engine operates and the difference
between gasoline and diesel engines.
- Demonstrate your knowledge of general maintenance. Do the following:
- Demonstrate how to check the fluid level of the following:
|Power steering fluid |
|Windshield washer fluid |
(automatic and standard) |
- Check battery fluid, if possible, and the condition of battery
- 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 car 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 out.
- 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
- Check headlight alignment.
- Demonstrate how to check the vehicle exhaust system.
- Demonstrate your knowledge of tires. Do the following:
- Explain the difference between tire and vehicle manufacturer's
information specifications and demonstrate where to find these
- Demonstrate how to check pressure and properly inflate a tire.
- Using the manufacturer's jack supplied with the vehicle:
||Demonstrate how to
engage the jack correctly on the vehicle. |
|Demonstrate how to
change a tire correctly.
- Explain the difference between bias-belted tires and radial-belted
- Diagram and explain in writing how to rotate bias-belted and
- Using the manufacturer's guidelines, rotate the tires on the vehicle.
- Explain the caster, camber, 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 following:
- 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 30).
- Perform an oil change and oil filter change on the 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
- 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 system works.
- 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
- Demonstrate your knowledge of ignition and electrical systems. Do the
- 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
- Demonstrate how to connect jumper cables on your battery properly.
Explain how to jump-start a vehicle.
- Explain the difference between electronic and points ignition systems.
- 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 transmissions.
- Explain the types of automatic transmission fluid.
- Explain the types of lubricants used in a standard transmission and in
- Explain the difference between front-wheel, rear-wheel, and four-wheel
- 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
- Explain the differences between disc and drum systems.
- Demonstrate checking conditions of a vehicle brake system. After
checking, make recommendations for repairs (if necessary).
- Explain the purpose, importance, and limitations of passive restraints.
BSA Advancement ID#: 127
Source: Boy Scout
Requirements, #33215E, revised 2002