1. Avoid the use of carbon tetrachloride as a cleaning agent because of the harmful vapors that it releases.
Use perchlorethylene or trichloroethylene. However, while less toxic than other chlorinated solvents, use these
cleaning agents with caution. Be sure the work area is adequately ventilated and use protective gloves,
goggles or face shield, and apron.
2. Exercise caution against burns when using oxalic acid to clean the cooling passages of the engine.
3. Use caution when welding on or near the fuel tank. Possible explosion could result if heat buildup inside
the tank is sufficient.
4. Avoid excessive injection of ether into the engine during start attempts. Follow the instructions on the
container or by the manufacturer of the starting aid.
5. When working on an engine that is running, accidental contact with the hot exhaust manifold can cause
severe burns. Remain alert to the location of the rotating fan, pulleys, and belts. Avoid making contact across
the two terminals of a battery, which can result in severe arcing.