Table of Contents
Advertisement
GM COACH MAINTENANCE MANUAL
Sec. 12
Page 149
Description and maintenance of the Diesel fuel
injector system, fuel oil pump, fuel oil manifolds,
blower, and governor are contained in separate
maintenance manual for GM Series 71 Diesel En-
gine, Form X-5014A.
FUEL OIL SYSTEM MAINTENANCE
It is important that fuel oil is clean and free
from water to assure efficient engine operation.
When storing and dispensing fuel oils, it must be
handled as described under ''Fuel Oil Storage and
Handling" later in this section.
FUEL OIL FILTERS
Two fuel oil filters,
mounted to a common
bracket on the engine (fig. 1), are provided to
keep the fuel oil clean and free from water as it
enters the injector.
Two small filters are also
provided in each injector.
The primary or lower of the two fuel oil fil-
ters is a cleanable (edge-type strainer) filter
and
is designed to remove the larger particles of solid
foreign matter and any water which may accumu-
late.
The secondary or upper filter is a removable
element (absorption) type, and is designed to re-
move all of the solid foreign matter that may
have passed through the edge type strainer.
CARE OF FUEL OIL FILTERS
In order for these filters to clean the fuel oil
it is important that they are given proper care.
Service in the following manner:
Primary Filter (Cleanable Type)
Primary filter (fig. 1) must be drained fre-
quently because if water is present in the fuel it
is most likely to accumulate in this filter.
No
definite draining periods can be given here, inas-
much as the necessity for draining depends upon
the cleanliness of the fuel put into the fuel tank.
It is recommended, that a small amount of fuel
oil be drained from this filter daily, noting the
water content (if any), then from this experience
definite draining periods may be established. Drain
filter by opening drain cock at bottom of filter.
If water in any amount is regularly found in this
filter, it is an indication that something is wrong
in the method of handling and storing of the fuel
oil and a thorough investigation must be made to
eliminate the trouble; then the fuel tank lines and
both filters drained and cleaned.
The only water
that will normally accumulate in the fuel system
is from condensation in the fuel tank.
Secondary Fuel Filter
(Renewable Element Type)
"1'-",
,-,
'
Primary Fuel Filter
(Edge Type Strainer)
figure J -fuel Filter Installation
TP 3439
a
Advertisement
Table of Contents
