3.4 Interface requirements.
3.4.1 Overall envelope and interface. The engine envelope dimensions and the mounting,
electrical, and mechanical interfaces shall conform to Drawings 11664451 for M809 vehicle or
11669328 for M939 vehicle, as applicable (see 220.127.116.11).
3.4.2 Engine weight with accessories. The engine with accessories shall weigh not more
than 2625 lbs (1191 kg) (see 18.104.22.168).
3.5 Support and ownership requirements.
3.5.1 Reliability. During Government specified vehicle tests, the engine assembly
installed in a 5 ton M809 or M939 series cargo truck with specified payload and towed load shall
operate in conformance with specified test cycles for 20 000 miles [32 186 kilometers (km)], and
shall not exceed the maintenance ratio criteria specified in 22.214.171.124 (see 126.96.36.199).
188.8.131.52 Maintenance ratio. During Government specified vehicle test cycles, the time
required to perform scheduled (not to include organizational operator daily maintenance) and
unscheduled engine maintenance shall not exceed 4% of the operating hours, based upon 20 miles
(32 km) equal one hour of operation. The unscheduled engine maintenance shall not exceed 2%
of the operating hours (see 184.108.40.206.1).
220.127.116.11 Maintainability. The engine and its installations shall permit accomplishment of
maintenance in the field with minimum time. Engine and installation features shall require
minimum quantity of special tools, minimum variety and quantity of maintenance tasks, maximum
practicable use of sealed assemblies and modules, and maximum accessibility for service and
repair. Engine mounted accessories shall be installed or mounted so that they may individually be
removed, replaced and the installation tested within one hour using normal hand tools and
maintenance procedures (see 18.104.22.168.2).
3.5.2 Oil filters. The engine oil filters shall be readily accessible and the design shall
facilitate hot oil draining and filter changes (see 22.214.171.124).
3.5.3 Oil filler and gage. The crankcase oil filler shall be arranged so that oil can be
readily poured into the filler opening without requiring the use of a funnel from a 5-quart (qt)
(4.7 liter (L)) round can or a 5-gallon (gal) (18.9 L) lug cover pail. The engine shall be provided
with a properly accessible waterproofed bayonet gage that ensures ready and accurate
determination of crankcase oil level with engine stopped (see 126.96.36.199).
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