Drive Train: Precautions - Chevrolet Trailblazer Service Manual

DRIVE TRAIN
Precautions
Before servicing any vehicle, please be sure to read all of the following precautions, which
deal with personal safety, prevention of component damage and important points to take
into consideration when servicing a motor vehicle:
Always wear safety goggles or some type of eye/face protection when working
with, around or under a vehicle.
Be extremely careful while working on an operating engine, make sure you have no
dangling jewelry, extremely loose clothes, power tool cords or other items that
could get caught in any moving engine part.
Never open, service or drain the radiator or cooling system when the engine is hot;
serious burns can occur from the steam and hot coolant.
Observe all applicable safety precautions when working around fuel. Whenever
servicing the fuel system, always work in a well-ventilated area. Do not allow fuel
spray or vapors to come in contact with a spark, open flame, or excessive heat (a
hot drop light, for example). Keep a dry chemical fire extinguisher near the work
area. Always keep fuel in a container specifically designed for fuel storage; also,
always properly seal fuel containers to avoid the possibility of fire or explosion.
Refer to the additional fuel system precautions later in this section.
Fuel injection systems often remain pressurized, even after the engine has been
turned OFF. The fuel system pressure must be relieved before disconnecting any
fuel lines. Failure to do so may result in fire and/or personal injury.
The EPA warns that prolonged contact with used engine oil may cause a number
of skin disorders, including cancer! You should make every effort to minimize your
exposure to used engine oil. Protective gloves should be worn when changing oil.
Wash your hands and any other exposed skin areas as soon as possible after
exposure to used engine oil. Soap and water, or waterless hand cleaner should be
used.
Never operate the engine without the proper amount and type of engine oil; doing
so WILL result in severe engine damage.
Brake fluid often contains polyglycol ethers and polyglycols. Avoid contact with the
eyes and wash your hands thoroughly after handling brake fluid. If you do get
brake fluid in your eyes, flush your eyes with clean, running water for 15 minutes. If
eye irritation persists, or if you have taken brake fluid internally, IMMEDIATELY
seek medical assistance.
Timing belt maintenance is extremely important! Many models utilize an
interference-type, non-freewheeling engine. If the timing belt breaks, the valves in
the cylinder head may strike the pistons, causing potentially serious (also time-
consuming and expensive) engine damage. Refer to the maintenance interval
charts in the front of this manual for the recommended replacement interval for the
timing belt and to the timing belt section for belt replacement and inspection.
Disconnecting the negative battery cable on some vehicles may interfere with the
functions of the on-board computer system(s) and may require the computer to
undergo a relearning process once the negative battery cable is reconnected.