5.4. Maintenance every 500 hours
of operation
5.4.1. Replace fuel pre-filter
Do not smoke and never bring a naked
flame near the fuel system when work-
ing on it.
Important !
Maximum cleanliness is required to
prevent dirt from entering the fuel system.
Fuel particles may damage the injection
system.
– Place a suitable vessel under the filter to trap
escaping fuel.
– Close the fuel supply line.
Note:
Fuel pre-filter maintenance intervals depend on
the purity of the fuel used in the engine and
should be reduced to 250 hours if necessary.
Replace fuel pre-filter
42
– Pull fuel supply line „1“ off fuel pre-filter „2“ at
both sides.
– Insert the new pre-filter.
Important !
When installing a new filter, note the arrow indi-
cating the correct flow direction (depends on
whether the tank is mounted HIGH or LOW.
The pre-filter’s installed position (direction of
flow) should be as vertical as possible.
– Open the fuel supply line.
43
Note:
On 2-4L41 C and 2-4M41 engines
To make starting easier, it is best to prime the
fuel delivery pump at lever „1“ until fuel is heard
to flow back through return line „2“ and into the
fuel tank.
– Operate the lever to check for leaks.
On 4L42 C and 4M42 engines
If starting appears difficult, bleed the injection
system by means of the manual fuel pump
(Chapter 4.1.2.)
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