Onan BF Series User Manual

BREATHER HOSE -
ACORN / \.
NUT
^cr~
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il
FLAT
WASHER
VALVE BOX
COVER
GASKET
REED VALVE
BREATHER BAFFLE
GASKET
FIGURE 4. OIL DRAIN LOCATION
FIGURE 3. CRANKCASE BREATHER
CRANKCASE OIL
Change crankcase oil every 50 operating hours and
only when the engine is warm. (Exception: Drain initial
oil fill at 25 operating hours.)
To drain, remove the 1/2-inch pipe cap on the side of
the oil base (Figure 4). After oil drains, replace the
pipe cap and refill crankcase with 4 pints (4-1/2 if
equipped with filter) of a good quality detergent oil.
Oil must meet or exceed the API (American
Petroleum Institute) designation SEorSE/CC; this oil
was formerly designated 2S MS, MS/DG or MS/DM.
For temperatures above 30°F, use SAE 30 oil; for
temperatures below 30°F, use 5W30 or 10W.
In extremely dusty conditions or in very cold weather,
change oil at least every 25 hours of operation.
Cooling System: Check and clean cooling fins at least
every 50 hours. Remove any dust, dirt or oil which
may have accumulated.
CAUTION
Plugged or clogged cooling fins can cause
overheating and engine damage.
CAUTION
Do not overfill crankcase. Do not use service
DS oil. Do not mix brands nor grades of motor
oil.
Spark Plugs: Check, clean and reset spark plugs
every 100 operating hours. Replace spark plugs that
show signs of fouling or electrode erosion.
13

Onan BF Series Specifications

General

Brand	Onan
Model	BF Series
Category	Welding System
Language	English