1. Under the Hood Safety
Apollo H.S. Technology Education

2. Safety Hot Stuff Moving Parts Battery Exhaust Manifold
Radiator, Radiator Cap, & Hoses
Engine block & oil filler cap.
Moving Parts
Serpentine Belt
Cooling Fan
Battery
Explosion!
Battery Acid

3. Exhaust Manifold
The exhaust manifold acts as the collection system for freshly burnt hydrocarbons
The picture on this slide is from a Formula I racing engine pushed to the limit.
Can be identified by its rusty oxidation on the exterior or the spaghetti like routing of its tubing.

4. Radiator Regarding safety –
The upper radiator hose is especially hot because it is coming directly from the engine block
Warm coolant enters at the top and works its way to the bottom while it is cooled with natural air flow, or from forced air from the cooling fan.
The radiator cap is under increasing pressure as the system heats up; avoid taking off the cap when the engine is hot! Burns to the face and hands can occur!
Radiator hoses in general can be quite hot.

5. Engine Block Engine Block
The engine block itself holds a lot of heat
Any part of the block can be hot enough at times to sustain burns
Use caution with metal components attached to the block
Plastic parts less likely to cause burns.
Hard to see? Engine block hidden by other parts and components.

6. Engine Oil Adding Oil & Reaching for the Dipstick Oil Filler Caps
Oil cap can be a bit hot – use leather gloves or a rag to remove
Burns or scrapes to the hand can and do happen when pulling and replacing the oil dipstick.
Oil Filler Caps

7. Serpentine Belt Always moving when the vehicle is on
the belt is very strong

8. Cooling Fan
A cooling fan can turn on even if the car is not running, especially on a hot day
rather hidden up against the radiator

9. Batteries Wear Safety Glasses
Warm up a frozen battery before jumpstarting
Do NOT contact both terminals at the same time with anything metal! (“crossing the terminals…)
Use gloves; rinse hands thoroughly with water and baking soda to neutralize battery acid.
-The danger from car batteries is not so much electrocution as it is explosion. If you touch both terminals with a metal wrench, for instance, you can create a spark that can ignite hydrogen gas in the battery. That can send pieces of battery and battery acid flying everywhere.
Batteries only produce 12 volts, so there is NO danger of being shocked.
-never touch a metal object such as a wrench between the positive and negative battery posts to see if the battery will spark. It will, and produce a current similar to a welding arc that may damage the tool, the battery and/or cause the battery to explode!