BENDIX M-12-M-12R ANTILOCK MODULATOR Spezifikationen PDF herunterladen (Seite 28)

Windsor-Severence Fire Protection District

Heavy Rescue

Production Specification

SVI #774 Page 28 of 126 April 19, 2010

ENGINE COOLING SYSTEM

There shall be a heavy-duty aluminum cooling system designed to meet the demands of the fire industry. The cooling

system shall have the capacity to keep the engine properly cooled under all conditions of road and pumping operations.

The cooling system shall be designed and tested to meet or exceed the requirements specified by the engine and

transmission manufacturer and all EPA requirements. The complete cooling system shall utilize heavy-duty welds and be

mounted to isolate the entire system from vibration or stress. The individual cores of the cooling system shall be mounted

in a manner to allow expansion and contraction at various rates without inducing stress into the adjoining cores.

The cooling system shall be comprised of a stacked, single depth package that provides the maximum cooling capacity

for the specified engine as well as offers excellent serviceability. The main components shall include a surge tank, a

charge air cooler, a recirculation shield, and a radiator.

Proposals unable to offer a stacked single depth cooling package shall not be considered.

There shall be a single depth core that allows greater efficiency, enhanced serviceability, and lighter weight with a higher

ambient capability.

The cooling package core shall not protrude below the frame of the vehicle by more than 1.1 inch. This feature shall

improve the angle of approach thereby reducing possible damage.

The radiator shall be a cross-flow design constructed completely of aluminum with welded side tanks. The radiator shall

include a minimum of a 627 square inch core and shall be bolted to the bottom of the charge air cooler to allow a single

depth core, thus allowing a more efficient and serviceable cooling system. The radiator shall be equipped with a drain

cock to drain the coolant for serviceability.

The cooling system shall include a one piece injected molded Polymer fan blade designed to provide long life in harsh

environments. Polymer fans provide a significant weight reduction over metal fans providing longer life for fan clutch

linings and bearings along with increased fan belt life.

The cooling system shall be equipped with a surge tank that is capable of removing entrained air from the system. The

surge tank shall be equipped with a low coolant probe and sight glass to monitor the level of the coolant. The surge tank

shall have a cap that meets the engine manufactures pressure requirements as well as the system design requirements.

All radiator tubes shall be formed from aluminized steel tubing. Recirculation shields shall be installed where required to

prevent heated air from reentering the cooling package and affecting performance. When a center bumper compartment

is installed an additional shield may be required to redirect the airflow into the coolers.

The charge air cooler shall be a cross-flow design constructed completely of aluminum with welded side tanks. The

charge air cooler shall have a minimum of a 390 square inch core and be bolted to the top of the radiator to allow a single

depth core, thus allowing a more efficient and serviceable cooling system.

All charge air cooler tubes shall be formed from aluminized steel tubing and installed with silicone hump hoses and

stainless steel “constant torque” style clamps meeting the engine manufactures requirements.

ENGINE COOLANT

The cooling package shall include Extended Life Coolant (ELC). The use of ELC provides longer intervals between

coolant changes over standard coolants providing improved performance. The coolant shall contain a 50/50 mix of

ethylene glycol and de-ionized water to keep the coolant from freezing to a temperature of -34 degrees F.

Proposals offering supplemental coolant additives (SCA) shall not be considered, as this is part of the extended life

coolant makeup.

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