51
Technical description
Fuel system
The fuel is drawn up by the feed pump from the fuel tank through the pre-filter(s) and is forced through the fine
filters to the injection pump. Excess fuel escapes via the overflow valve back to the tank. This valve is located
on the injection pump. This means that the return fuel flushes through (cools) the injection pump’s fuel cham-
ber. This evens out fuel temperature so it is the same for all the cylinders and prevents gas bubbles forming in
the fuel line.
The injection pump then forces the fuel under high pressure to the injectors, which atomize the fuel when it is
sprayed into the engine’s combustion chambers.
Return fuel from the injectors returns to the tank via the overflow valve.
Fuel system
1. Fine fuel filters
2. Venting nipple
3. Pressure pipe from inlet
manifold (charging
pressure)
4. Injection pump
5. Pressure pipe
6. Injectors
7. Fuel return line
8. Pressure equalizer
9. Centrifugal governor
10. Overflow valve
11. Return pipe, lubricating oil
12. Return line to fuel tank
13. Fuel line, intake
14. Feed pump
15. Hand pump
16. Engine oil pipe, inlet
17. Smoke limiter
TAMD63 and TAMD71, -73WJ: Solenoid valve
(fuel shut-off valve) for stopping engine
A. Solenoid valve
Connections in valve housing, markings:
T. Inlet from fuel tank (Tank)
P. Outlet to feed pump (Pump)
F. Inlet from fuel filters (Filter)
I.
Outlet to injection pump (Injection pump)
2
3
4
5
6
7
8
13
12
10
9
11
15
14
16
1
17
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Summary of Contents for TAMD63L
Page 1: ...INSTRUCTION BOOK TAMD63L P TAMD71B TAMD73P WJ TAMD74C L P ...
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Page 120: ...118 Notes 7740156 Downloaded from www volvopenta com 22 07 2009 00 44 08 ...
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Page 124: ...7740156 0 English 6 2000 AB Volvo Penta SE 405 08 Göteborg Sweden www volvopenta com ...