SkyTrak 6036 Service Manual - Manual (Page 134)

Section 8B Cummins Engine
8B-14 Model 6036/6036T S/N 9B0500 thru 14833
8B.8 ENGINE OIL
SPECIFICATIONS
The use of quality engine lubricating oils combined
with appropriate oil drain and filter change inter-
vals are critical factors in maintaining engine
performance and durability.
Use Cummins Premium Blue 15W40 multi-
viscosity oil or equivalent meeting the American
Petroleum Institute (API) Classification of CD or
CE (severe duty diesel engine) specifications.
The use of multi-viscosity lubricating oil has been
found to improve oil consumption control and
improve engine cranking in cold temperatures
while maintaining lubrication at high operating
temperatures.
While 15W40 multi-viscosity oil is recommended
for most climates, refer to Fig. 8B.36, for oil
viscosity recommendations for extreme climates.
IMPORTANT: DO NOT use special “break-in”
lubricating oils for new or rebuilt Cummins en-
gines. Use the same type of oil during the “break-
in” as used in normal operation.
NOTE: Limited use of low viscosity oils, such as
10W30 may be used for easier starting and
providing sufficient oil flow at ambient tempera-
tures below 23 °F (–5 °C). However, continuous
use of low viscosity oils can decrease engine life
due to wear. Refer to Fig. 8B.36.
If an engine is operated in ambient temperatures
consistently below –10 °F (–23 °C) and there are
no provisions to keep the engine warm when it is
not in operation, use a synthetic CE or CD engine
oil with adequate low temperature properties such
as; 5W20 to 5W30.
Fig. 8B.36 SAE Oil Viscosity Recommendations
MA1950
SAE Oil Viscosity Recommendations
20W-40
15W-40, 15W-50
10W-30
5W-30
5W-20
°C
°F
-50
-58
-40
-40
-30
-22
-20
-4
-10
14
0
32
10
50
20
68
30
86
40
104
Anticipated Ambient Temperature
The oil supplier must be responsible for meeting
the performance service specifications.
IMPORTANT: The use of a synthetic base oil
does not justify extended oil change intervals.
Extended oil change intervals can decrease
engine life due to factors such as; corrosion,
deposits and wear.
8B.9 ENGINE COOLING
SYSTEM
The engine cooling system consists of coolant
passages in the engine, oil cooler, thermostat,
pump, hoses, a radiator and a radiator overflow
bottle.
The engine is cooled by the circulation of coolant
through passages in the cylinder block and head.
Circulation is by thermo-syphon action assisted by
an impeller type water pump driven by a drive belt
from the crankshaft pulley.
The water pump bearings are prepacked with a
special grease during assembly and do not require
attention in service.
8B.9.1 Coolant Requirements
The quality of coolant will determine the efficiency
and life of the cooling system.
1. Check antifreeze concentration, Fig. 8A.37,
several weeks before the beginning of the cold
season. The antifreeze must have an ethyl-
ene glycol (ethanediol) base. Use a low
silicate antifreeze that conforms to one of the
standards given on following page or which
contains no more than 0.1 percent anhydrous
alkali metasilicate.
Fig. 8B.37 Testing Antifreeze Concentration
MA1510
HYDROMETER