MIL-T-62276C
3.4 Chassis components.
3.4.1 Engine. The engine furnished shall be the chassis manufacturer's standard or optional engine for the commercial model truck which meets or exceeds the requirements of this specification.
* 3.4.1.1 Diesel engine. The vehicle shall be equipped with a liquid cooled, compression ignition, two-stroke or four-stroke cycle diesel engine, with not less than six cylinders. Engine net horsepower used in performance prediction calculations shall be determined in accordance with SAE J1349. The engine shall demonstrate the performance characteristics specified herein when using diesel fuel conforming to VV-F-800. In addition, when specified (see 6.2), the engine shall operate satisfactorily on grade JP-4 and grade JP-5 fuel conforming to MIL-T-5624 under emergency, short duration conditions and on grade JP-8 fuel conforming to MIL-T-83133 under normal conditions. A power loss when operating JP-4, JP-5 or JP-8 is acceptable.
3.4.1.2 Oil filter. A full-flow or combined full-flow and bypass oil filter with replacement element shall be furnished.
* 3.4.1.2.1 Oil cooler. An engine oil cooling system shall be furnished.
* 3.4.1.3 Governor. An engine governor shall be furnished and set and sealed to limit the engine to the engine manufacturer's maximum recommended operating speed.
* 3.4.1.4 Cooling system. The cooling system shall maintain the engine coolant at a temperature below the boiling point with the vehicle loaded to rated GVW and operated at an altitude of 10,000 feet above sea level or in an ambient air temperature of not less than
125 degrees Fahrenheit (°F). The coolant system shall include a surge tank or a coolant recovery reservoir of not less than two-quart capacity.
3.4.1.5 Coolant temperature control. Thermostatic control of engine coolant temperature shall be provided. The control shall include partial thermostatic control of coolant flow through the radiator and thermostatically controlled radiator shutters, or complete thermostatic control of all coolant flow through the radiator. On tilt cab models, a radiator servicing access door shall be provided to allow verification of the coolant level.
* 3.4.1.6 Fan clutch. A fan clutch shall be provided. The fan clutch shall reduce fan speed automatically when the fan is not required for engine cooling. The fan clutch shall be asbestos free.
* 3.4.1.7 Power plant heaters and fuel warmer. When specified (see 6.2), a coolant heater, an engine oil heater, and a fuel warmer shall be provided. Heaters shall operate on 110-volt alternating current (ac), and shall be wired through a junction block, including a fuse or circuit breaker, to a single three-pronged (male), weatherproof, slave receptacle for receiving external
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