Fig 5-28 Fuel pump - cross section (example)
001
002
003
004
005
006
007
014
013
012
011
010
009
008
Legend
001 HP fuel to fuel rail 008 Guide piston
002 Fuel inlet 009 Driver (of pump plunger)
003 Pump plunger 010 Regulating sleeve
004 Compression spring 011 Toothed rack
005 Bottom spring carrier 012 Fuel outlet
006 Roller 013 Non-return valve
007 Cam 014 Pump cover
5.5.3.2 Lubrication
Engine lubricating oil, which flows through the lubricating oil inlet into the bottom housing,
lubricates the fuel pump.
Leakage fuel lubricates the pump plunger (003). The leakage fuel and the engine lubricating oil
from the regulating sleeve (010) flows through the drain bore. This mixture then flows into an
internal bore in the housing of the fuel pump unit.
5.5.3.3 Operation with an unserviceable fuel pump
If a fuel pump is unserviceable (eg the pump plunger cannot move) or the HP fuel pipe is broken
(between the fuel pump and the fuel rail) the fault must be repaired immediately. If the fault cannot
be repaired, it is possible to cut out the unserviceable fuel pump. Related to the number of installed
fuel pumps, there are limits of operation.
X92-B
AA00-5556-00AAA-043A-A
Operation Manual Fuel pump
Winterthur Gas & Diesel Ltd.
- 167 - Issue 002 2021-11
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