Blending; Biodiesel Fuels; Biodiesel Fuels And Preheater; Biodiesel Fuels And The Engine - PREVOST H3-41 Maintenance Manual

SECTION 03 : FUEL SYSTEM
NOTE
Engine and vehicle manufacturers expect
ULSD fuel to be fully compatible with the
existing fleet, including 2006 and earlier model
year vehicles. In
introduction of ULSD fuel to older vehicles
may affect fuel system components or loosen
deposits in fuel tanks. As part of a good
maintenance program, owners and operators
of existing cars, trucks and buses are
encouraged to monitor their diesel-powered
vehicles closely for potential fuel system leaks
or premature fuel filter plugging during the
change-over to ULSD fuel.
NOTE
Like Low Sulfur Diesel fuel, ULSD fuel
requires good lubricity and corrosion inhibitors
to prevent unacceptable engine wear. As
necessary, additives to increase lubricity and
to inhibit corrosion will be added to ULSD fuel
prior to its retail sale.

6.2 BLENDING

Only ultra low sulfur kerosene – No.1 diesel with
no more than 15ppm sulfur may be blended with
ULSD fuel to improve
performance. With
formulations on the market, care must be taken
to select kerosene with a maximum of 15ppm
sulfur.
Blend rates remain the same as with Low Sulfur
Diesel fuel.

6.3 BIODIESEL FUELS

Biodiesel up to a maximum of 20% blend (B20)
may be used and
manufacturers' mechanical warranty as to
engine and emissions
components, provided the biofuel used in the
blend conforms to ASTM D6751, B1 to B5
blends conform to ASTM D975, and B6 to B20
blends conform to ASTM D7467. Also, any
engine performance problem related to the use
of biodiesel fuel would not be recognized nor
considered as Volvo or Prevost's responsibility.
However, Volvo engines are certified to comply
with U.S. EPA and
14 PA1621 Maintenance Manual All Series | Section Revised September 2017
some instances, the
cold weather
so many kerosene
will not affect the
system related
California emissions
standards based upon the use of test fuels with
specifications established by these regulatory
agencies.
Alternative fuels, including biodiesel, that are not
substantially similar to the required test fuels
may adversely affect
compliance. As a result, Volvo does not warrant
the engine will conform to applicable Federal or
California emissions limits when operated on
biodiesel or other alternative fuels that are not
substantially similar to specified test fuels used
for certification.
Additional maintenance care must be carried-out
for the following systems:
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 Spheros
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).
engine emissions
Access the air cleaner