Engine Maintenance
78
Oil pressure is affected by oil temperature, oil
viscosity, and engine speed. Low oil pressure can
usually be traced to the lack of oil, a faulty oil
pressure control valve, loose connections in the
lubrication system, or worn bearings. Low oil
pressure is not normally caused by a faulty oil
pump.
Engine Oil Change
The engine oil should be changed according to the
“Maintenance Inspection Schedule”. Drain the oil
only when the engine is hot to ensure that all the
oil drains out. When changing oil, try to make
sure that the unit is not tipped away from the
direction that the oil is supposed to flow out of the
oil pan. It is important to drain as much of the
residual oil as possible because most of the dirt
particles are in the last few quarts of oil that are
drained from the oil pan. Refill the oil pan (refer
to the “Specifications” chapter) and check the oil
level. Run the unit, and then recheck the oil level.
Add oil as necessary to reach the full mark on the
dipstick. See the Specifications page for the
correct type of oil.
Oil Filter Change
The oil filter should be changed along with the
engine oil.
Spin-on Filter:
1. Remove the filter.
2. Apply oil to the rubber ring of the new filter
and install the filter.
3. Tighten the filter until the rubber ring makes
contact, and then tighten it 1/2 turn more.
Crankcase Breather
The crankcase breather system ducts crankcase
gases formed in the crankcase directly to the air
intake. Harmful vapors that would otherwise
collect in the crankcase and contaminate the oil,
or escape to the outside, are drawn back into the
engine and burned. The breather hose should be
inspected yearly to make sure it is not plugged.
Engine Air Cleaner
EMI 2000
The EMI 2000 air cleaner is a dry element air
cleaner used in late model units. The air cleaner
filters all of the air entering the engine. Excessive
restriction of the air intake system affects
horsepower, fuel consumption and engine life.
Inspect the element at every oil change.
On dry element air cleaners equipped with an air
restriction indicator, check the air restriction
indicator during Pretrip inspections. The air
restriction indicator is attached to the intake side
of the air cleaner assembly.
Replace the air filter when the air restriction
indicator reads 25 in. (635 mm) of vacuum. Press
the reset button on the top of the air restriction
indicator after replacing the air filter element.
Replace the EMI 2000 air cleaner element when
the air restriction indicator reads 25 in. (635 mm)
of vacuum, or at 2,000 hours, or 1 year, whichever
1. Oil Filter
2. Oil Pressure Control Valve Nut
3. Oil Pressure Control Valve
Figure 29: Oil Filter Parts
AEA624
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