Montgomery Ward MX-27129A Owner's Manual And Parts List page 18

CRANKCASE OIL
Oil capacity of the generating set is four U.S. quarts
(3.78 litres). Fill the crankcase until the oil reaches the
full ("F") mark on the oil level indicator (Figure 19).
FIGURE 19. ENGINE OIL LEVEL INDICATOR
Use an oil with the API (American Petroleum
Institute) designation SE or SE/CC. Oil should be
labeled as having passed MS Sequence Test (also
known as ASTMG-IV Sequence Test). Refer to oil
chart below for recommended viscosity according to
temperature.
Use ashless or low-ash oil for gaseous fuel operation.
operating hours or 3 months, whichever occurs first.
If operating in extremely dusty or dirty conditions,
the oil might have to be changed sooner. When
adding oil between changes, use the same brand as in
the crankcase. Various brands of oil might not be
compatible when mixed together.
Oil consumption may be higher with a multi-grade oil
than with a single-grade oil if both oils have compar-
able viscosities at 210° F (99°C). Therefore, single-
grade oils are generally more desirable unless antici-
pating a wide range of temperatures. Use the proper
grade oil for the expected conditions.
The oil drain is located on the right side of the engine.
Do NOT check oil while the engine is oper-
ating. Hot oil could cause burns by blowing
W A R N I N G
out of oil fill due to crankcase pressure.
AIR CLEANER
Proper maintenance of the air cleaner is extremely
important. Negligence of regular routine mainten-
ance will result in reduced engine life.
Remove the oil cup on the bottom of the air breather
(Figure 20), empty the existing oil, and thoroughly
clean the cup and screen in a petroleum-base sol-
vent. Dry the cup and screen, fill cup with oil (same
weight oil as in crankcase) to oil level mark.
W A R N I N G
Use extreme care when cleaning with a petroleum-
base cleanser due to fire hazard.
K E E P C O N N E C T I O N S
A I R T I G H T
O I L
LEVEL!
C U P
R E T A I N E R S C R E W
FIGURE 20. AIR CLEANER ASSEMBLY
"Not recommended for gaseous fuel operation.
Check oil level after each operation (or 8 hours opera-
tion, whichever occurs first) and change oil every 100
CRANKCASE BREATHER
Lift off the rubber breather cap and carefully pry valve
from cap (Figure 21). If valve doesn't come out easily,
press hard with both your thumbs on top of the cap
16