Pierce Enforcer, Руководство оператора

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MAINTENANCE
6-22 / Engine, Cooling, Fuel and Exhaust
© 2018 Pierce Manufacturing Inc. All Rights Reserved.
6-18.1 General Inspection and Service
1. Check the engine coolant level (with engine stopped). The engine water pump can draw air as well as coolant
when the coolant level drops below the coolant make-up line connection at the radiator or the top of the radiator
core.
2. Fill radiator or surge tank to proper level with permanent-type antifreeze and water. See “Antifreeze Type” on
page 6-23 . Water should be clean and free from any corrosive and scale forming chemicals (not softened water).
Radiators and oil coolers that get dirty inside and outside lose their ability to absorb and radiate heat.
3. Clean radiator and charge air cooler using compressed air to remove bugs, dirt, and other debris. Steam clean
annually. Clean from the side opposite the direction of airflow.
4. Check for leaks and straighten bent fins with needle-nose pliers.
6-18.2 Hoses
Check for soft, mushy feel or swelling. Also look for cracks in the hose around the clamp area. Replace defective
hoses.
6-18.3 Hose Clamps
Constant torque type hose clamps are used on most coolant lines. These clamps should be installed during initial
assembly or reassembly with to a torque of 100 in-lbs. The clamp will likely drop in torque value after exposure to
hot coolant and should be maintained to a torque of 45 in-lbs thereafter.
Tighten standard worm-drive style clamps to 30-45 in-lbs. The clamp will likely drop in torque value after exposure
to hot coolant and should be maintained to a torque of 30 in-lbs thereafter.
Replace clamps as required with same style as originally supplied.
6-18.4 Water Pump
Inspect water pump and hose connections for leaks.
6-18.5 Thermostats
Check thermostats yearly. Install new ones if necessary. Thermostats are stamped with the opening temperature.
For example, a thermostat marked 175°F (70°C) indicates that this is the approximate temperature at which the
thermostat starts to open. A thermostat is fully open at approximately 20°F (11°C) above the opening temperature.
Observe engine temperature gauge to check thermostat operation.
Always allow the engine to cool before opening the pressure cap. Wrap a thick, heavy cloth around the
cap. Push down, and turn the cap to the first notch position. Pause before opening completely to allow
any remaining pressure to escape. Follow this procedure to avoid burns from hot steam or coolant.
Wear safety goggles when blowing debris from radiator, or damage to eyes may result.
Do not use antifreeze with a “stop leak” additive as this additive may clog the cooling system.
Always fill coolant system properly and completely, or serious engine damage may result.