5.3.5. Check water trap
(
On 4L42C and 4M42 engines only)
The water trap inspection interval depends
exclusively on the water contained in the fuel
and on the care applied in refuelling. It may be
admissible to extend the intervals, or it may be
necessary to considerably shorten the intervals.
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– Release the drain plug „1“ and collect the
liquid in a transparent vessel.
If the drain plug is not easily accessible, an
extension piece of hose can be slipped on the
plug.
– If an insufficient amount of liquid leaves the
tank, release additionally plug „2“.
As water is heavier than diesel fuel, first the
water, then the fuel will escape. This is indicated
by the clearly visible separating line.
– If finally only fuel leaves through the port, the
drain plug „1“ can be closed again.
– Subsequently, re-tighten plug „2“.
Note:
If starting appears difficult, bleed the
injection system using the manual fuel pump
(Chapter 4.1.2.)
2
1
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.
L3/79
1
2
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