AirMan PDS185S-6C1, Руководство по обслуживанию

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3. Electric System
3-1
3.1 Engine electric appliances
3.1.1 VE PUMP
The engine mounted on PDS185S-6C1 is equipped with VE type injection pump. VE pump has been
developed to be small, light-weighted, high speed injection pump. They are mainly mounted on diesel
cars and small trucks.
■
Structure of VE pump
In-line pump needs each one plunger for each cylinder of engine, but VE pump has one metering
plunger regardless of the number of engine cylinders, and this turns reciprocally to meter fuel to each
cylinder. Governor, timer and feed pump are incorporated in the pump body. For this reason, compared
with inline pump, it has less parts and further small sized and light-weighed.
■
Excellent performance
1. Excellent gas emission performance
When VE pump is used for same type swirl chamber engine, NOx gas is emitted less compared with
inline pump. (Fluctuation among cylinders is reduced because of one set plunger only used.)
2. Excellent reliability
VE pump has been originally developed to be used for diesel engine cars. Small sized inline pump runs
4,000min
-1
, but VE can run 6,000min
-1
maximum.
When this engine is used for comparably lower speed industrial machines, the machine reliability
increases in addition to less spare parts required and simple construction.
3. Engine noise is reduced
VE pump has one plunger regardless of numbers of engine cylinders. Fuel is fed by one plunger,
injection volume is metered smoothly. As fluctuation of engine fuel injection is reduced, and especially
under low load operation, engine noise can be cut remarkably.
■
Special attention during operation
VE pump can be lubricated interiorly with fuel filled, so when bad quality fuel is used, it could cause
trouble to engine. As for fuel, use diesel fuel oil (having higher than 45 cetane number).
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