Scalding
Do not remove the radiator cap or expansion tank until the engine is cold.
Engine oil, transmission and steering fluids can also be dangerously hot if the engine has been running recently.
Burns
Any part of the engine is a risk of burns, especially the exhaust system. Brake parts may become hot immediately after braking.
The fall of a raised car
When working under or near a raised machine, always place a sturdy chock under the machine, or use a trestle or pit.
Never work under a machine supported only by a jack!
Be careful when loosening or screwing fasteners with high torque when this work is done on a raised machine. It is recommended that the initial release and final tightening in such cases be carried out with the vehicle lowered.
Fire
Fuel is highly flammable, fuel vapors are explosive.
Avoid spilling fuel onto hot engine surfaces.
Do not smoke or use open flames near the vehicle while it is undergoing any repairs. Protect against sparks from electrical appliances or hand tools.
Fuel vapors are heavier than air, so do not work on the fuel system in a pit.
Another source of fire is an overload or short circuit in electrical wiring circuits. Be careful when repairing or replacing electrical equipment.
Have a fire extinguisher on hand suitable for extinguishing burning fuel and electrical wiring.
Electric shock
Ignition high voltage wires can be dangerous, especially for people with heart problems. Do not touch the ignition system while the engine is running.
Vapor or gas poisoning
Exhaust gases are poisonous: they usually contain carbon monoxide, which, if inhaled, is quickly fatal. Never let the engine run for a long time indoors. like in a closed garage.
Poisonous is also the vapor of fuel and various solvents used for cleaning, as well as for diluting paints.
Poisonous and irritating substances
Avoid skin contact with electrolyte, fuel, especially diesel, brake fluid, grease and antifreeze. If necessary, pour liquid from one container to another, do not suck liquid from the hose. If you accidentally swallow any liquid or get it in your eyes, seek medical attention immediately.
Prolonged contact with used engine oil can cause skin cancer. If necessary, wear rubber gloves or lubricate your hands with a protective cream. Change clothes that have been exposed to oil and do not carry oily rags in your pocket.
Air conditioner refrigerant can form poisonous gas when in contact with fire, including cigarettes. It can also cause skin burns.
Asbestos
Asbestos dust is a carcinogen: it can cause cancer if inhaled or swallowed. Asbestos is an integral part of some gaskets, as well as brake and friction linings. If you don't know if a component contains asbestos, it's safer to assume that it contains asbestos.