Fuel system
General
Injectors
The fuel is induced by the feed pump from the fuel tank
through a water separating pre-filter (accessory) and
pressed through the fine filter to the injection pump
(Fig. 85).
The engines are fitted with injectors (Fig. 86). Each in-
jector basically consists of a nozzle holder and a
nozzle.
When the fuel pressure has increased to the set value
(opening pressure) the nozzle needle (pin) (5) lifts
which is held pressed against its seat by the thrust
washer (6) and atomised fuel is injected into the en-
gine�s precombustion chamber.
Return fuel from the injectors is led through the fuel leak
pipe/return pipe back to the tank.
The injector�s opening pressure is determined by the
tension of the thrust washer, which in turn is adjusted
with adjuster washers (7).
3
6
Fig. 85. Fuel system, principle drawing
1.
2.
3.
Fuel tank
Pre-filter
Feed pump
4. Fine fuel filter
5. Injection pump
6. Injector
Injection pump
The injection pump is a flange-mounted in-line pump
placed on the right-hand side of the engine. The pump
is driven via cams on the engine�s camshaft which di-
rectly activate the pump element.
Fig. 86. Injector, complete
1.
2.
3. Nozzle sleeve
4.
5.
Packing
Nozzle nut
6. Thrust washer
7. Adjusterwashers
8. Nozzle holder
9. Nut
Centrifugal regulator
Spacer
Nozzle needle (pin)
The regulator is mechanical and works with speed
sensing regulator weights. It is fitted at the front on the
camshaft gear from where it is also driven.
The regulator weights activate the injection pump�s con-
trol rod via the regulator sleeve, a lever and a regulator
arm. The speed is regulated over the entire engine
speed range, from low idling speed to high speed (uni-
versal type).
Fuel filter
The fuel filter is of the disposable type. The filter insert
consists of a specially wound paper filter.
Feed pump
The feed pump is also positioned on the right-hand of
the engine and is driven via a cam on the engine�s cam-
shaft.
53
| Categories | Volvo Penta Manuals |
|---|---|
| Tags | Volvo Penta MD2010, Volvo Penta MD2020, Volvo Penta MD2030, Volvo Penta MD2040 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.25 out of 5)
Marine readers have rated Volvo Penta MD2010 MD2020 MD2030 MD2040 Workshop Manual 4.3 out of 5.0 based on 4 product reviews. GOOD AND GOODER S=GOODEST. IS BESTER
jeg skal bruge manualen , til at samle min Volvo penta md 2030 igen.
Ö, hur dka jag veta om det är bra innan jag set produkten.
Pages 58 and 59 are missing from Volvo Penta MD2010 MD2020 MD2030 MD2040 Workshop Manual. I need only these pages at present!