Bleeding The Fuel System - Mercedes-Benz Unimog Operating Instructions Manual

Engine
322
X
Unscrew filter element A from filter
head :.
X
Unscrew water separator D from filter ele-
ment A and clean it or replace as neces-
sary.
X
Replace filter element A.
X
Coat new sealing ring C lightly with engine
oil.
X
Screw water separator D with sealing ring
C onto filter element A hand-tight.
X
Coat new sealing ring B lightly with engine
oil.
X
Screw on filter element A with new sealing
ring B hand-tight on filter head :.
X
Close drain plug E and bleed screw =.
X
Bleed the fuel system (
X
Check the fuel system for leaks.

Bleeding the fuel system

Fuel system without fuel prefilter
! Do not bleed the fuel system by operating
the starter motor for an extended period of
time. You could otherwise damage the
starter motor.
X
Fill up the fuel tank to above the reserve
range ( Y page 216).
X
Start the engine (
Y
( page 160).
If the engine does not start: stop the
starting procedure after a period of
20 seconds, wait for approximately one
minute and then repeat the starting proce-
dure. After three starting attempts, wait
approximately three minutes before trying
again.
If the engine starts: let it idle for approx-
imately one minute. The fuel system is self-
bleeding.
Y page 322).
Y page 318) or
Fuel system with fuel prefilter
! Do not bleed the fuel system by operating
the starter motor for an extended period of
time. You could otherwise damage the
starter motor.
X
Fill up the fuel tank to above the reserve
range ( Y page 216).
X
Press hand pump : of fuel prefilter ;
approximately fifty times in succession.
The filter housing is then filled with fuel.
X
Start the engine ( Y
( Y page 160).
If the engine does not start: stop the
starting procedure after a period of
20 seconds, wait for approximately one
minute and then repeat the starting proce-
dure. After three starting attempts, wait
approximately three minutes before trying
again.
If the engine starts: let it idle for approx-
imately one minute. The fuel system is self-
bleeding.
page 318) or