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Chapter 5 – Pre-Operation Inspection
Warning
Never remove the radiator cap while the engine is hot.
The cooling system is under pressure. Hot coolant could
cause severe burns or eye injury. Wear protective clothing
and safety glasses.
Check coolant reservoir level (refer to Figure 5.3) only
when the engine is cool to touch. Coolant should be visible
in the sight gauge. Add coolant, if necessary.
Figure 5.3 – Coolant Reservoir
Engine Oil
Modern diesel engines place very high demands on the
lubricating oil to be used. The specific engine performanc-
es lead to an increased thermal load on the lubricating oil.
The lubricating oil is also more exposed to contamination
due to reduced oil consumption and longer oil change
intervals. For this reason it is necessary to observe the
requirements and recommendations described in this
operating manual in order not to shorten the life of the
engine.
Lubricating oils always consist of a base oil and an addi-
tive package. The most important tasks of a lubricating oil
(e.g. wear protection, corrosion protection, neutralization
of acids from combustion products, prevention of coke
and soot deposits on the engine parts) are assumed
by the additives. The properties of the base oil are also
decisive for the quality of the product, e.g. with regard to
thermal load capacity. In principle, all engine oils of the
same specification can be mixed. However, mixing of
engine oils should be avoided because the worst prop-
erties of any of the components in the mixture are always
dominant, affecting the result.
The lubricating oils shown in Figure 5.4 are permissible
for the engine in this machine.
34
Cap
Sight Gauge
Figure 5.4 – Engine Oil Recommendations
The ambient temperature at the installation site or in the
application area of the engine is decisive for choosing
the right viscosity class. Too high a viscosity can lead
to starting difficulties, too low a viscosity can endanger
the lubrication effect and cause a high lubricating oil
consumption.
Depending on the ambient temperature, the common
viscosity classes shown in Figure 5.5 are recommended.
Figure 5.5 – Engine Oil Viscosity
Check the engine oil level by pulling out the yellow oil
dipstick handle (refer to Figure 5.6). Unscrew the oil fill
cap and add engine oil (API CJ-4), if necessary.
XR5919-A
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