TM 5-3825-226-24
FUEL SYSTEM
The sleeve metering fuel system is a pressure type fuel
system. The name for the fuel system is from the
method used to control the amount of fuel sent to the
cylinders. This fuel system has an injection pump for
each cylinder of the engine. It also has a fuel transfer
pump on the front of the injection pump housing. The
governor is on the rear of the injection pump housing.
The drive gear for the fuel transfer pump is on the front
of the camshaft for the injection pumps. The carrier for
the governor weights is bolted to the rear of the
camshaft for the injection pumps. The injection pump
housing has a bearing at each end to support the
camshaft. The camshaft for the sleeve metering fuel
system is driven by the timing gears at the front of the
engine.
The injection pumps, lifters and rollers, and the
camshaft are all inside of the pump housing. The pump
housing and the governor housing are full of fuel at
transfer pump pressure (fuel system pressure).
CAUTION
Diesel fuel is the only lubrication for
the moving parts in the transfer
pump, injection pump housing, and
the governor. The injection pump
housing must be full of fuel before
turning the camshaft.
This fuel system has governor weights, a thrust collar
and two governor springs. One governor spring is for
high idle and the other governor spring is for low idle.
Rotation of the shaft for governor control, compression
of the governor springs, movement of connecting
linkage in the governor and injection pump housing
controls the amount of fuel sent to the engine cylinders.
Fuel from fuel tank (7) is pulled by fuel transfer pump
(11) through water separator (F) and fuel filter (9). From
fuel filter (9) the fuel goes to housing for fuel injection
pumps (14). The fuel goes in housing (14) at the top
and goes through inside passage (20) to fuel transfer
pump (11).
SCHEMATIC OF FUEL SYSTEM
1. Fuel priming pump (closed position). 2. Fuel priming pump (open position). 3. Return line for constant bleed valve.
4. Constant bleed valve. 5. Manual bleed valve. 6. Fuel injection nozzle. 7. Fuel tank. 8. Fuel inlet line. 9. Fuel
filter. 10. Bypass valve for fuel priming pump. 11. Fuel transfer pump. 12. Fuel bypass valve. 13. Camshaft. 14.
Housing for fuel injection pumps. A. Check valve. B. Check valve. C. Check valve. D. Check valve. F. Water
Separator.
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