Biodiesel Fuels And Preheater; Biodiesel Fuels And The Engine; Air Cleaner (Dry Type); Pre-Cleaner Servicing - PREVOST H3-41 Maintenance Manual

6.3.1

Biodiesel Fuels and Preheater

For operation of the preheater with biodiesel, a
retrofit is mandatory. Refer to the guidelines
outlined in the last version of the Valeo
Workshop Manual for Thermo 230, 300, 350,
available on the Technical Publications USB
flash drive and on Prevost technical publications
website.
6.3.2

Biodiesel Fuels and the Engine

Use an oil sampling method to establish the
appropriate oil drain interval for your application.
Fuel filter change intervals should be analyzed
and adjusted accordingly.

7. AIR CLEANER (DRY TYPE)

The vehicle is equipped with a dry-type
replaceable element air cleaner, located in the
engine compartment.
through the engine R.H. side door. Engine air
enters the air cleaner through an intake duct on
the R.H. side of the rear cap, next to the last
window. It then flows through a pre-cleaner and
finally through the air cleaner. The pre-cleaner
removes dust and moisture by means of a
discharge tube at the bottom of the element. It is
in series with a replaceable impregnated paper
filter element (air cleaner).

7.1 PRE-CLEANER SERVICING

MAINTENANCE
The pre-cleaner is designed to be self-cleaning;
however, it should be inspected and any
accumulated foreign material removed during
the periodic replacement of the impregnated
paper filter element.

7.2 AIR CLEANER SERVICING

Replacing the air filter cartridge is important to
preserve a good air quality at a sufficient level.
Neglecting this servicing could lead to an
efficiency loss and eventual engine problems.
Follow these steps to replace the filter cartridge:
Access the air cleaner
PA1621 Maintenance Manual All Series | Revised May 2018
SECTION 03 : FUEL SYSTEM
7.2.1

Checking restriction indicator

Locate the restriction gage in the engine
compartment, at the back of the vehicle.
Consisting of a black tube, it is fixed on the main
intake hose.
R
ESTRICTION INDICATOR
FIGURE 27 RESTRICTION INDICATOR LOCATION
Indication of a need to replace the filter will be
apparent once its line turns red. Proper
operation will be indicated by a green line.
Consult the servicing schedule for time intervals
between each regular filter change.
7.2.2

Replacing the Filter

 Remove the four filter cover plastic bolts. The
filter itself can be removed by pulling it with
gentle movements from left to right and
up/down. A residual suction may occur,
creating additional resistance.
Empty the drain rubber valve located under

the filter housing; if damaged this part can be
ordered and changed.
FIGURE 28 RUBBER DRAIN VALVE UNDER FILTER
 Using a clean damp cloth, wipe the sealing
flange and the inside of the outlet tube.
R
UBBER DRAIN VALVE
19